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Небесная энциклопедия

Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Мониторинг СМИ

Мониторинг СМИ и социальных сетей. Сканирование интернета, новостных сайтов, специализированных контентных площадок на базе мессенджеров. Гибкие настройки фильтров и первоначальных источников.

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03-12-2018 дата публикации

Приёмник с аудио выходом

Номер: RU0000185379U1
Автор: Иван Алексеевич Налогин, Игорь Анатольевич Новожилов
Принадлежит: Открытое акционерное общество "ИСТОК-АУДИО ИНТЕРНЭШНЛ"

Полезная модель относится к средствам, удовлетворяющим жизненные потребности человека, в частности к способам и устройствам, обеспечивающих людей с дефектами слуха возможностью замены прямого слухового восприятия другим видом восприятия, в частности предназначена для трансляции аудиоинформации от телевизора, музыкального центра или другого звуковоспроизводящего устройства и получение по радиоканалу сигналов от различных датчиков. Техническим результатом является возможность трансляции аудиоинформации от звуковоспроизводящих устройств и получение по радиоканалу сигналов от различных датчиков путём подсоединения в «разрыв» приемника по отношению к звуковоспроизводящим устройствам. Указанный технический результат достигается тем, что приёмник оснащен темброблоком с регуляторами частоты, антенна выполнена встроенной и соединена с радиомодулем, который соединен с микроконтроллером, соединенный с кнопкой меню. Приемник оснащен блоком управления светодиодами, соединенным с блоком светодиодов. Блок схема приёмника имеет блок «Mute», регуляторы ВЧ, НЧ и громкости, операционные усилители, линейные входы, линейный выход, микрофонный вход, микрофонный усилитель, оптический вход, приемник с декодером S/PDIF, цифроаналоговый преобразователь. При этом блок-схема оснащена блоком питания, контактом для адаптера питания и расположена в корпусе, оснащенном крышкой со световодом по периметру. На гранях корпуса выполнены: кнопка настройки, элемент настройки громкости, элементы настройки тембров высокой частоты и низкой частоты, разъем питания, разъем S/PDIF, микрофонный вход, линейный вход 1, линейный вход 2 и линейный выход. РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 185 379 U1 (51) МПК H03G 3/00 (2006.01) H04B 1/16 (2006.01) H04R 25/00 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ПОЛЕЗНОЙ МОДЕЛИ К ПАТЕНТУ (52) СПК H03G 3/00 (2018.08); H04B 1/16 (2018.08); H04R 25/00 (2018.08) (21)(22) Заявка: 2018126839, 21.07.2018 (24) Дата начала отсчета срока действия ...

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Номер записи: 1
25-12-2018 дата публикации

Устройство управления СВЧ усилителя

Номер: RU0000185932U1
Автор: Александр Алексеевич Дугарский, Андрей Афанасьевич Мокринский, Владимир Викторович Сарафанов, Николай Игорьевич Поленов, Олег Николаевич Крылов
Принадлежит: Акционерное общество "Научно-исследовательский институт Приборостроения имени В.В. Тихомирова", Публичное акционерное общество "Авиационная холдинговая компания "Сухой"

Предлагаемая полезная модель относится к области электротехнических устройств, а именно к устройствам регулирования коэффициента усиления усилителей. Техническим результатом предлагаемого решения является достижение возможности регулировки выходной мощности СВЧ усилителя с высоким быстродействием. Технической проблемой решаемой предлагаемой полезной моделью является расширение функциональных возможностей СВЧ усилителя путем регулирования его выходной мощности с высоким быстродействием. Устройство управления СВЧ усилителя содержит цифровое устройство управления (1) и N каналов. Каждый канал содержит усилитель (2), (7), (12), (17), световод (3), (8), (13), (18), устройство управления силовым ключом (4), (9), (14), (19); силовой ключ (5), (10), (15), (20). Первый канал содержит источник отрицательного напряжения (6), а каналы со второго по N-й - источники положительного напряжения (11), (16), (21). 1 з.п. 2 ил. РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 185 932 U1 (51) МПК H03G 3/00 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ПОЛЕЗНОЙ МОДЕЛИ К ПАТЕНТУ (52) СПК H03G 3/00 (2006.01); H03F 3/00 (2006.01); H03G 5/00 (2006.01) (21)(22) Заявка: 2018127979, 30.07.2018 (24) Дата начала отсчета срока действия патента: Дата регистрации: 25.12.2018 (45) Опубликовано: 25.12.2018 Бюл. № 36 Адрес для переписки: 140180, Московская обл., г. Жуковский, Гагарина, 3, Акционерное общество "Научноисследовательский институт приборостроения имени В.В. Тихомирова" B1, 13.01.2009. US 6388530 B1, 14.05.2002. RU 125791 U1, 10.03.2013. RU 172828 U1, 26.07.2017. U 1 1 8 5 9 3 2 (56) Список документов, цитированных в отчете о поиске: US 6069528, 30.05.2000. US 7477102 (54) Устройство управления СВЧ усилителя (57) Реферат: Предлагаемая полезная модель относится к области электротехнических устройств, а именно к устройствам регулирования коэффициента усиления усилителей. Техническим результатом предлагаемого решения является достижение возможности регулировки выходной ...

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Номер записи: 2
01-03-2012 дата публикации

Amplifier gain adjustment in response to reduced supply voltage

Номер: US20120049961A1
Автор: David S. Ripley, Phil Lehtola
Принадлежит: Skyworks Solutions Inc

A power amplifier gain control system that monitors power supply voltage and changes the gain of the amplifier in response to changes in supply voltage. In systems subject to changes in supply voltage, such as in a battery powered system, the supply voltage can change over time. Reductions in the supply voltage may force the amplifier out of linear operation. A detector circuit compares the supply voltage in relation to one or more threshold values to determine if the supply voltage is less than a minimum nominal voltage. In response to the supply voltage falling below the minimal nominal voltage, amplifier gain is reduced to maintain amplifier linearity. A second threshold may be utilized in the comparison to the supply voltage when transitioning to the original gain level to prevent oscillation. A latching may be provided to prevent gain changes during active transmit periods.

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Номер записи: 3
02-05-2013 дата публикации

Device and Method for Processing a Real Subband Signal for Reducing Aliasing Effects

Номер: US20130108077A1
Автор: EDLER Bernd, POPP Harald
Принадлежит: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.

In order to process a subband signal of a plurality of real subband signals which are a representation of a real discrete-time signal generated by an analysis filter bank, a weighter for weighting a subband signal by a weighting factor determined for the subband signal is provided to obtain a weighted subband signal. In addition, a correction term is calculated by a correction term determiner, the correction term determiner being implemented to calculate the correction term using at least one other subband signal and using another weighting factor provided for the other subband signal, the two weighting factors differing. The correction term is then combined with the weighted subband signal to obtain a corrected subband signal, resulting in reduced aliasing, even if subband signals are weighted to a different extent. 1. A device for processing a real subband signal of a plurality of real subband signals which are a representation of a real discrete-time signal generated by an analysis filter bank , comprising:a weighter for weighting the subband signal by a weighting factor determined for the subband signal to achieve a weighted subband signal;a correction term determiner for calculating a correction term, the correction term determiner being implemented to calculate the correction term using at least one other subband signal and using another weighting factor provided for the other subband signal, the other weighting factor differing from the weighting factor; anda combiner for combining the weighted subband signal and the correction term to achieve a corrected subband signal.2. The device according to claim 1 , wherein the correction term determiner is implemented to generate the correction term in dependence on a difference of the weighting factor of the subband signal and the other weighting factors for the further subband signal.3. The device according to claim 1 , wherein the correction term determiner is implemented to determine the correction term in ...

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Номер записи: 4
09-05-2013 дата публикации

METHOD AND APPARATUS FOR EMULATING SOUND

Номер: US20130114820A1
Автор: Cho Jae-Yong, PARK Hae-kwang
Принадлежит: SAMSUNG ELECTRONICS CO., LTD.

A method of emulating a sound of an audio apparatus by using a sound emulation apparatus includes obtaining k past samples (where k is a natural number that is equal to or greater than 1) by delaying a current sample of an audio signal; applying a plurality of characteristic functions indicating an input/output relationship of the audio apparatus to the current sample and the k past samples, respectively; and adding the current sample and the k past samples, to which the plurality of characteristic functions have been applied, respectively, to generate an emulation sound of the audio apparatus. 1. A method of emulating a sound of an audio apparatus by using a sound emulation apparatus , the method comprising:obtaining k past samples (where k is a natural number that is equal to or greater than 1) by delaying a current sample of an audio signal;applying a plurality of characteristic functions indicating an input/output relationship of the audio apparatus to the current sample and the k past samples, respectively; andadding the current sample and the k past samples, to which the plurality of characteristic functions have been applied, respectively, to generate an emulation sound of the audio apparatus.2. The method of claim 1 , wherein the obtaining of the k past samples comprises obtaining the k past samples by inputting the current sample to k delay modules.3. The method of claim 1 , wherein k is a natural number that is equal to or greater than 2 claim 1 , andwherein the obtaining of the k past samples comprises obtaining a first past sample by inputting the current sample to a delay module and obtaining a second past sample by inputting the first past sample to the delay module.4. The method of claim 1 , wherein k is a natural number that is equal to or greater than 2 claim 1 , andwherein the obtaining of the k past samples comprises obtaining a first past sample by inputting the current sample to a first delay module and obtaining a second past sample by ...

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Номер записи: 5
16-05-2013 дата публикации

Sigma-Delta Modulator Approach to Increased Volume Resolution in Audio Output Stages

Номер: US20130120060A1
Автор: Sebastian Loeda
Принадлежит: Dialog Semiconductor GmbH

A variable gain analog amplifier is described that uses pulse-density modulation in the form of a sigma-delta modulator (SDM) to produce a gain by modulating the selection of a switch that selects the amount of resistance in a negative feedback loop of the amplifier. The output of the SDM is dithered to increase the gain resolution of the analog amplifier, wherein the increased resolution produces a quiet, inaudible transition between changes in gain setting at an output of the variable gain amplifier and in addition produces a quiet, inaudible mixing and merging of audio signals..

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Номер записи: 6
20-06-2013 дата публикации

Non-Linear Capacitance Compensation

Номер: US20130154744A1
Автор: Bockelman David E., Kimball Eric, Samavedam Anil, Srinivasan Vishnu
Принадлежит:

Embodiments are directed to capacitance compensation via a compensation device coupled to a gain device to compensate for a capacitance change occurring due to an input signal change, along with a controller coupled to the compensation device to receive the input signal and to control an amount of compensation based on the input signal. In some embodiments, banks may be formed of multiple compensation devices, where each of the banks has a different size and is coupled to receive a different set of bias voltages. 1. An apparatus comprising:a gain device to receive an input signal and to output an amplified signal; anda compensation device coupled to the gain device to compensate for a change in a capacitance of the gain device occurring due to a change in the input signal; anda controller coupled to the compensation device to receive the input signal and to control an amount of capacitance compensation provided by the compensation device based on the input signal.2. The apparatus of claim 1 , wherein the compensation device is biased in an inversion region.3. The apparatus of claim 1 , wherein the compensation device includes a complementary metal oxide semiconductor (CMOS) transistor having a first terminal coupled to a first bias voltage node claim 1 , a second terminal coupled to a first capacitor claim 1 , and a gate terminal coupled to the first capacitor at a second bias voltage node claim 1 , the second bias voltage node to receive the input signal.4. The apparatus of claim 3 , wherein the CMOS transistor is to be set deep into strong inversion when disabled and substantially close to strong inversion when enabled.5. The apparatus of claim 3 , wherein the CMOS transistor is to be set deep into accumulation when disabled and substantially close to strong inversion when enabled.6. The apparatus of claim 3 , wherein a size of the first capacitor is controllable by the controller.7. The apparatus of claim 1 , further comprising a plurality of compensation devices ...

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Номер записи: 7
20-06-2013 дата публикации

SYSTEM AND METHODS FOR APPLYING BASS COMPENSATION

Номер: US20130156225A1
Автор: GRIFFITHS DENNIS L., Winegar Robert Charles
Принадлежит:

Systems and methods for providing bass compensation to correct for uneven bass response are disclosed. An example bass compensation system includes a low pass filter configured to receive an audio signal from an audio source and provide a filtered audio signal, the low pass filter having a roll off of at least 18 dB per octave. The bass compensation system further includes a summing amplifier coupled to the low pass filter and configured to sum the audio signal from said audio source and the filtered audio signal to provide a summed audio signal, wherein the summed audio signal provided by the summing amplifier provides a bass boost at a first frequency and mid bass cut at a second frequency greater than the first frequency. 1. A bass compensation system , comprising:a low pass filter configured to receive an audio signal from an audio source and provide a filtered audio signal, the low pass filter having a roll off of at least 18 dB per octave; anda summing amplifier coupled to the low pass filter and configured to sum the audio signal from said audio source and the filtered audio signal to provide a summed audio signal,wherein the summed audio signal provided by summing amplifier provides a bass boost at a first frequency and mid bass cut at a second frequency greater than the first frequency.2. The bass compensation system of claim 1 , further comprising a level control circuit coupled to the low pass filter to receive the filtered audio signal from the low pass filter claim 1 , the level control circuit configured to provide control of the amount of bass boost and mid bass cut.3. The bass compensation system of claim 1 , further comprising a switch coupled to the low pass filter and the summing amplifier claim 1 , the switch configured to coupled and decoupled the summing amplifier and the low pass filter to engage and disengage bass compensation.4. The bass compensation of claim 1 , further comprising a switch coupled to the low filter and configured to ...

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Номер записи: 8
27-06-2013 дата публикации

BASS ENHANCEMENT SYSTEM

Номер: US20130163784A1
Автор: Katsianos Themis, Tracey James, Walker Oveal Jerome
Принадлежит: DTS LLC

A bass enhancement system can provide an enhanced bass effect for speakers, including relatively small speakers. The bass enhancement system can apply one or more bass enhancements to an input audio signal. For example, the bass enhancement system can exploit how the human ear processes overtones and harmonics of low-frequency sounds to create the perception that non-existent (or attenuated) low-frequency sounds are being emitted from a loudspeaker. The bass enhancement system can generate harmonics of at least some low-frequency fundamental frequencies in one embodiment. Playback of at least some harmonics of a low-frequency fundamental frequency can cause a listener to perceive the playback of the low-frequency fundamental frequency. Advantageously, in certain embodiments, the bass enhancement system can generate these harmonics without performing processing-intensive pitch-detection techniques or the like to identify the fundamental frequencies. 1. A system for enhancing bass audio , the system comprising:a bass enhancer comprising one or more processors, the bass enhancer configured to generate harmonics of one or more bass frequencies of an input audio signal based at least in part on available headroom in the input audio signal;an equalizer configured to emphasize frequencies in the input audio signal comprising lowest reproducible frequencies of a speaker; anda level adjuster configured to adaptively apply a gain to at least a lower band of frequencies in the input audio signal, wherein the gain depends on available headroom in the input audio signal.2. The system of claim 1 , wherein the bass enhancer is further configured to generate the harmonics by at least:determining available headroom in the input audio signal; andapplying a second gain to approximately half of the input audio signal, the second gain being greater than the available headroom in the input audio signal and thereby generating harmonics of one or more fundamental bass frequencies in the ...

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Номер записи: 9
18-07-2013 дата публикации

CROSS PRODUCT ENHANCED SUBBAND BLOCK BASED HARMONIC TRANSPOSITION

Номер: US20130182870A1
Автор: VILLEMOES Lars
Принадлежит: DOLBY INTERNATIONAL AB

The invention provides an efficient implementation of cross-product enhanced high-frequency reconstruction (HFR), wherein a new component at frequency QΩ+Ωis generated on the basis of existing components at Ω and QΩ+Ω. The invention provides a block-based harmonic transposition, wherein a time block of complex subband samples is processed with a common phase modification. Superposition of several modified samples has the net effect of limiting undesirable intermodulation products, thereby enabling a coarser frequency resolution and/or lower degree of oversampling to be used. In one embodiment, the invention further includes a window function suitable for use with block-based cross-product enhanced HFR. A hardware embodiment of the invention may include an analysis filter bank (), a subband processing unit () configurable by control data () and a synthesis filter bank (). 163-. (canceled)64. A system configured to generate a time stretched and/or frequency transposed signal from an input signal , the system comprising:an analysis filter bank configured to derive a number Y≧1 of analysis subband signals from the input signal, wherein each analysis subband signal comprises a plurality of complex-valued analysis samples, each having a phase and a magnitude;a subband processing unit configured to generate a synthesis subband signal from the Y analysis subband signals using a subband transposition factor Q and a subband stretch factor S, at least one of Q and S being greater than one, wherein the subband processing unit comprises: i) form Y frames of L input samples, each frame being extracted from said plurality of complex-valued analysis samples in an analysis subband signal and the frame length being L>1; and', 'ii) apply a block hop size of h samples to said plurality of analysis samples, prior to forming a subsequent frame of L input samples, thereby generating a sequence of frames of input samples;, 'a block extractor configured to i) the phase of the processed ...

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Номер записи: 10
01-08-2013 дата публикации

PEAK DETECTION WHEN ADAPTING A SIGNAL GAIN BASED ON SIGNAL LOUDNESS

Номер: US20130195279A1
Автор: Baehren Frank, Hess Wolfgang
Принадлежит: Harman Becker Automotive Systems GmbH

Various embodiments relate to a system for adapting a signal gain, which comprises a peak detector configured to receive an audio input signal containing consecutive signal blocks and to dynamically establish a current input signal level of the audio input signal, and a loudness determination unit configured to dynamically determine a perceived loudness of a current signal block of the audio input signal based on a psycho-acoustic model of a human hearing. Furthermore the system comprises a time constant generation unit configured to determine a time constant based on the perceived loudness of the current signal block and the perceived loudness of a preceding signal block, wherein the time constant describing a change of the signal gain. A gain determination unit is configured to determine the signal gain for the current signal block based on the time constant and the current input signal level. 1. A method of adapting a signal gain , the method comprising:receiving an audio input signal containing consecutive signal blocks;establishing a current input signal level of the audio input signal;determining a perceived loudness of a current signal block of the audio input signal based on a psycho-acoustic model of a human hearing using a signal level range of the current signal block of the audio input signal;determining the signal gain for the current signal block based on a time constant and based on the current input signal level, the time constant describing a change of the signal gain from a signal block to another signal block, wherein the time constant is determined based on the perceived loudness of the current signal block and the perceived loudness of a preceding signal block; andamplifying the audio input signal with the determined signal gain to obtain an audio output signal.2. The method according to claim 1 , wherein the signal gain is determined such that an output signal level of the audio output signal is always smaller than a predefined threshold.3. The ...

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Номер записи: 11
01-08-2013 дата публикации

ELECTRONIC DEVICE, CONTROLLING METHOD AND CONTROLLING PROGRAM FOR ELECTRONIC DEVICE, AND RECORDING MEDIUM

Номер: US20130195280A1
Автор: SUGIYAMA Juri, UENO Taku
Принадлежит: SHARP KABUSHIKI KAISHA

An electronic device includes (i) an input-volume measuring section () for measuring input volume, which is volume of a sound inputted into the sound input section () while the sound output section () is performing sound output, (ii) a feedback-volume estimating section () for estimating estimated volume, estimated volume is volume of a sound which is to be inputted into the sound input section () in a state in which there is no object which blocks the sound in a predetermined range, (iii) volume determination section () for determining whether or not the input volume is lower than the estimated volume, and (iv) a function control section () for carrying out a predetermined process if the input volume is lower than the estimated volume. 1. An electronic device including a sound output section and a sound input section , comprising:input-volume measuring means for measuring input volume, which is volume of a sound inputted into the sound input section while the sound output section is performing sound output;feedback-volume estimating means for estimating estimated volume in a reference state, estimated volume being volume of a sound outputted from the sound output section and is to be inputted into the sound input section, and the reference state being a state in which there is no object which blocks the sound outputted from the sound output section and is to be collected by the sound input section in a predetermined range defined by a position of one of the sound output section and the sound input section;volume determination means for determining whether or not the input volume measured by the input-volume measuring means is lower than the estimated volume estimated by the feedback-volume estimating means; anddevice function control means for carrying out a predetermined first process if the volume determination means determines that the input volume is lower than the estimated volume.2. An electronic device as set forth in claim 1 , further comprising:state ...

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Номер записи: 12
08-08-2013 дата публикации

BEMF MONITOR GAIN CALIBRATION STAGE IN HARD DISK DRIVE SERVO INTEGRATED CIRCUIT

Номер: US20130200954A1
Автор: LI QUNYING, Swize Gregory, Tan Wenxiao
Принадлежит: TEXAS INSTRUMENTS INCORPORATED

A high performance digitalized Programmable Gain Amplifier (PGA). In prior art circuit, a dual-ladder DAC is employed for gain control, the back gate leakage of NMOS resistors in the fine ladder conquers fine ladder nominal current and it produces non-monotonic gain scallop. Two new art design techniques: (1) adaptively control the fine ladder; and (2) use dummy PMOS brunch device leakage compensates for the NMOS resistor device leakage, are proposed so that the non-monotonic scallops are substantially eliminated and 13-bit resolution/accuracy PGA has been achieved. 1. An apparatus including a programmable gain amplifier , the programmable gain amplifier including:a coarse ladder having a plurality of resistors, wherein each of the plurality of resistors are individually addressable; 'a plurality of banks of FETs, each bank including a plurality of FETs, and', 'a fine ladder that is coupleable to the coarse ladder, wherein the find ladder includes'}a fine ladder controller, wherein the each of the plurality of banks of the fine ladder are controllable by the fine ladder controller.2. The apparatus of claim 1 , wherein each of the FETs is an NFET.3. The apparatus of claim 2 , wherein a PMOS bank is coupled to a corresponding NFET banks so that the leakage current provided by the PMOS bank locally compensates for the NMOS bank back gate leakage.4. The apparatus of claim 1 , further comprising a 7 bit LSB decoder coupled to each of the banks of fine ladder.5. The apparatus of claim 1 , wherein the effective resistance of the fine ladder can be adaptively adjusted by turning on some banks of FETs and turning off other banks of FETS claim 1 , based on which coarse ladder resistor is coupled (shunted) with the fine ladder.6. The apparatus of claim 5 , wherein the effective resistance of the fine ladder is adjusted in such way that the ratio between the fine ladder resistance and the coupled (shunted) coarse ladder resistor is relatively a constant.7. The apparatus of ...

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Номер записи: 13
08-08-2013 дата публикации

SIGNAL PROCESSING APPARATUS, SIGNAL PROCESSING METHOD, PROGRAM,SIGNAL PROCESSING SYSTEM, AND COMMUNICATION TERMINAL

Номер: US20130202131A1
Автор: Inoue Akira, KEMMOCHI Chisato, Touyama Keisuke
Принадлежит: SONY CORPORATION

There is provided a signal processing apparatus including a provision control unit that provides choices expressed subjectively and associated with control for an acoustic signal, and an output unit that outputs a predetermined choice selected from the provided choices. 1. A signal processing apparatus comprising:a provision control unit that provides choices expressed subjectively and associated with control for an acoustic signal; andan output unit that outputs a predetermined choice selected from the provided choices.2. The signal processing apparatus according to claim 1 ,wherein the provision control unit changes a display aspect of the provided choices, according to the selected choice or a feature amount of an acoustic signal of a processing object.3. The signal processing apparatus according to claim 1 ,wherein the provided choices are subjective senses and/or subjective requests to be handled.4. The signal processing apparatus according to claim 1 , further comprising:a calculating unit that calculates an adjustment parameter to adjust an acoustic signal of a processing object, based on individual parameters measured in advance, the selected predetermined choice, and a feature amount of the acoustic signal of the processing object.5. The signal processing apparatus according to claim 4 ,wherein the individual parameters are parameters showing aural characteristics.6. The signal processing apparatus according to claim 4 ,wherein the individual parameters are parameters showing characteristics of a microphone and/or a speaker.7. A signal processing method comprising:providing choices expressed subjectively and associated with control for an acoustic signal; andoutputting a predetermined choice selected from the provided choices.8. A signal processing apparatus comprising:an acquiring unit that acquires an adjustment parameter calculated based on individual parameters measured in advance, a predetermined choice selected from choices expressed subjectively and ...

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Номер записи: 14
15-08-2013 дата публикации

MULTICHANNEL SPEAKER ENCLOSURE

Номер: US20130208916A1
Автор: Debard Nicolas, Pares Benjamin
Принадлежит:

The invention relates to a speaker enclosure comprising at least two channels, wherein a first and second channel are respectively dedicated to separate and adjacent first and second frequency bands, each of said channels including a filtering stage supplied by the control signal and a speaker unit, wherein said speaker enclosure is characterized in that said channels also include means for simultaneously: disconnecting the first channel from the control signal; and modifying the filtering stage of the second channel so as to modify the frequency response thereof. 1. A speaker system comprising at least two channel , wherein a first and a second channels are respectively dedicated to a first and a second different and adjacent frequency bands , each of these channels comprising a filtering stage supplied with the control signal and a driver , characterized in that they also comprise means for simultaneously:disconnecting the first channel from the control signal;modifying the filtering stage of the second channel to modify its frequency response, by displacing the cut-off frequency of the second channel towards the frequency band dedicated to the first channel.2. The speaker system of claim 1 , wherein the modification of the frequency response comprises modifying the tonal balance on all or part of the bandwidth.3. The speaker system of claim 1 , wherein the second frequency band has a high cut-off frequency higher than the high cut-off frequency of the first band.4. The speaker system of claim 1 , wherein the second frequency band has a low cut-off frequency lower than the low cut-off frequency of the first band.5. The speaker system of claim 3 , characterized in that the filtering stage of the second channel comprises a high-pass filter claim 3 , with a low cut-off frequency Fand in that the modified filtering stage of the second channel comprises a high-pass filter with a low cut-off frequency Fsmaller than F.6. The speaker system of claim 5 , characterized in ...

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Номер записи: 15
22-08-2013 дата публикации

Apparatus and method for amplifying a signal from a transmitter

Номер: US20130215995A1
Автор: Genik Anatoly
Принадлежит:

The subject matter discloses a method of amplifying a signal, the method comprising receiving a command to start transmission, gradually increasing a value of an enable signal used to amplify the transmission and intermittently transmitting the value of the enable signal to an enable transistor used to allow amplifying a transmitted signal. 1. A method of amplifying a signal , the method comprising:receiving a command to start transmission;gradually increasing a value of an enable signal used to amplify the transmission;intermittently transmitting the value of the enable signal to an enable transistor used to allow amplifying a transmitted signal.2. The method according to claim 1 , further comprises a step of generating a trapezoid signal used to gradually increase the value of the3. The method according to claim 2 , further comprises a step of converting a square signal into the trapezoid signal.4. The method according to claim 2 , wherein the trapezoid signal is received at the enable transistor.5. The method according to claim 1 , wherein the transmitted value is an impedance value.6. A transmission unit claim 1 , comprises: a common source transistor', 'an enable transistor used to allow transmission of signals from the transmission unit;, 'an amplifying module, comprisingwherein the enable transistor receives a gradually increased signal in an intermittent manner.7. The transmission unit according to claim 6 , further comprising a mechanism for generating a trapezoid signal used to gradually increase the signal;8. The transmission unit according to claim 6 , further comprising a mechanism for converting a square signal into the trapezoid signal.9. The transmission unit according to claim 6 , wherein the mechanism comprises a reverse counter for detecting signals received from a control unit and an accumulator for summing the number of detected signals.10. The transmission unit according to claim 6 , wherein the detected signals are selected from a group ...

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Номер записи: 16
22-08-2013 дата публикации

VEHICULAR ACTIVE SOUND EFFECT GENERATING APPARATUS

Номер: US20130216054A1
Автор: INOUE Toshio
Принадлежит: HONDA R&D CO., LTD.

A sound effect generating apparatus includes a delay unit for giving a delay to a sound effect output from a rear speaker depending on either an accelerator opening change which represents a change per unit time in an accelerator opening or the accelerator opening itself. 1. A vehicular active sound effect generating apparatus comprising:a waveform data table for storing waveform data of one period;a rotational frequency detecting unit for detecting a rotational frequency of an engine of a vehicle;a reference signal generating unit for generating a harmonic reference signal based on the rotational frequency by reading the waveform data from the waveform data table;a control signal generating unit for generating a control signal to generate a sound effect to be output into a passenger compartment of the vehicle, based on the reference signal;an accelerator opening detecting unit for detecting an accelerator opening of the vehicle;an amplitude-adjusted control signal generating unit for generating an amplitude-adjusted control signal by adjusting an amplitude of the control signal depending on the accelerator opening;a plurality of speakers for outputting the sound effect based on the amplitude-adjusted control signal;wherein the speakers include a front speaker positioned in a front portion of the vehicle and a rear speaker positioned in a rear portion of the vehicle; anda delay unit for giving a delay to a sound effect output from the rear speaker depending on either an accelerator opening change which represents a change per unit time in the accelerator opening or the accelerator opening itself.2. The vehicular active sound effect generating apparatus according to claim 1 , wherein the delay unit gives a delay having a predetermined amount to the sound effect output from the rear speaker when the accelerator opening change exceeds a threshold value.3. The vehicular active sound effect generating apparatus according to claim 1 , wherein the delay unit changes an ...

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Номер записи: 17
22-08-2013 дата публикации

AUDIO SUBMIX MANAGEMENT

Номер: US20130216066A1
Автор: Osterman Lawrence W., Yerrace Frank D.
Принадлежит: MICROSOFT CORPORATION

Described herein are one or more implementations offering a centralized (e.g., single-point) user-interface, where a user may manipulate audio properties (e.g., volume level) for one or more audio submixes produced by each of multiple active operating-system processes. 1. A method comprising:discovering multiple audio submixes on a computer;assigning each of the multiple audio submixes to at least one of a plurality of classifications;displaying individual audio properties for each of one or more audio submixes assigned to a first classification; anddisplaying classification-level audio properties for a second classification, wherein the classification-level audio properties control at least two audio submixes assigned to the second classification.2. The method as recited in claim 1 , wherein one or more of the multiple audio submixes are associated with an active operating system process currently executing on the computer.3. The method as recited in claim 1 , wherein one or more of the multiple audio submixes are associated with an inactive operating system process configured on the computer and not currently executing on the computer.4. The method as recited in claim 1 , wherein one or more of the multiple audio submixes are not currently audible on the computer yet have recently been audible on the computer within a predefined amount of time.5. The method as recited in claim 1 , further comprising automatically increasing volume of audio submixes with voice communications and automatically decreasing volume of audio submixes without voice communications.6. The method as recited in claim 1 , further comprising examining a memory of the computer to discover the multiple audio submixes.7. One or more computing devices storing instructions that claim 1 , when executed by one or more processors claim 1 , perform operations comprising:discovering multiple audio submixes, each audio submix being produced by a different operating system process; andgenerating a user ...

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Номер записи: 18
19-09-2013 дата публикации

Linearization Circuit and Related Techniques

Номер: US20130241655A1
Автор: Liss Cheryl V., Muir John, Shen-Schultz Qin, Tajima Yusuke
Принадлежит: Auriga Measurement Systems, LLC

Circuits and techniques to linearize the operation of an RF power amplifier are described. A linearizer circuit may include a non-amplification signal path which includes a delay line and an amplification signal path which includes at least one amplifier stage. In some embodiments, the amplification signal path may include an odd number of amplification stages. The linearizer may be used to precondition an input signal of an RF power amplifier in a manner that improves the overall linearity of operation. 1. A linearizer circuit comprising:a divider circuit having an input and first and second outputs;a first radio frequency (RF) signal path having an input and an output, the input being coupled to the first output of the divider circuit, the first RF signal path comprising a delay line having a predetermined length;a second RF signal path having an input and an output, the input being coupled to the second output of the divider circuit, the second RF signal path comprising a transistor amplifier consisting of an odd number of gain stages; anda combiner circuit having a first input, a second input, and an output, the first input of the combiner circuit being coupled to the output of the first RF signal path and the second input of the combiner circuit being coupled to the output of the second RF signal path.2. The linearizer circuit of wherein:the divider circuit is configured to create a nominal 90 degree phase difference between output signals at the first and second outputs thereof; andthe combiner circuit is adapted to receive two substantially opposite phase signals at the first and second inputs thereof with an additional nominal 90 degree phase shift and combine the signals while cancelling the 90 degree phase shift.3. The linearizer circuit of wherein the second RF signal path further comprises:a first variable attenuator coupled between the input of the second RF signal path and an input of the transistor amplifier; anda second variable attenuator coupled ...

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Номер записи: 19
07-11-2013 дата публикации

AUDIO SIGNAL PROCESSING METHOD AND ELECTRONIC DEVICE SUPPORTING THE SAME

Номер: US20130294621A1
Автор: KIM Jaehyun, KIM Misun, OH Kyungseok, OH Sanghoon
Принадлежит: SAMSUNG ELECTRONICS CO., LTD.

A method of processing an audio signal is provided. The method includes receiving at least one digital audio stream from at least one audio source, applying at least one gain value to each of the at least one digital audio stream by a gain adjustment unit, mixing the at least one digital audio stream to which the at least one gain value has been applied, calculating a representative gain value from the at least one gain value, calculating an extra valid headroom based on the representative gain value for correction of the mixed at least one digital audio stream, and post-processing the mixed at least one digital audio stream using the extra valid headroom. 1. A method of processing an audio signal , the method comprising:receiving at least one digital audio stream from at least one audio source;applying at least one gain value to each of the at least one digital audio stream by a gain adjustment unit;mixing the at least one digital audio stream to which the at least one gain value has been applied;calculating a representative gain value from the at least one gain value;calculating an extra valid headroom based on the representative gain value for correction of the mixed at least one digital audio stream; andpost-processing the mixed at least one digital audio stream using the extra valid headroom.2. The method of claim 1 , further comprising:collecting the at least one gain value before the mixing of the at least one digital audio stream to which the at least one gain value has been applied.3. The method of claim 2 , wherein the collecting includes:examining an activated audio track among audio tracks; andcollecting a gain value of a gain adjustment unit connected to the activated audio track.4. The method of claim 1 , wherein the calculating of the representative gain value includes any one of:acquiring an average value of the at least one gain value as the representative gain value; andacquiring a largest value among the at least one gain value as the ...

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Номер записи: 20
14-11-2013 дата публикации

PROGRAMMABLE-GAIN AMPLIFIER

Номер: US20130300503A1
Автор: Hebert Gary K.
Принадлежит: THAT CORPORATION

An integrated circuit (IC) includes a programmable gain amplifier. The programmable gain amplifier comprises a first-stage amplifier configured to operate with at least one relatively high power supply voltage in order to accommodate at the input of the first-stage amplifier a relatively large range of input signals, the first-stage amplifier having a gain setting that is adjustable from a set of predetermined gain settings separated in relatively coarse increments so as to minimize the number of analog switches that must be implemented with high-voltage active devices in order to set each gain setting. The programmable gain amplifier also includes a second-stage amplifier configured to operate with at least one relatively low power supply voltage, lower than the high power supply voltage in order to minimize the required IC area for the second-stage amplifier, wherein the gain of the second-stage amplifier is adjustable from a set of gain settings separated in relatively small increments between the coarse increments in order to achieve a combined predetermined gain resolution. The gain of the programmable gain amplifier is programmable by adjusting the gain of each of the first-stage and second-stage amplifiers. 1. An integrated circuit (IC) including a programmable gain amplifier , the programmable gain amplifier comprising:a first-stage amplifier configured to operate with at least one relatively high power supply voltage in order to accommodate at the input of the first-stage amplifier a relatively large range of input signals, the first-stage amplifier having a gain setting that is adjustable from a set of predetermined gain settings separated in relatively coarse increments so as to minimize the number of analog switches that must be implemented with high-voltage active devices in order to set each gain setting; anda second-stage amplifier configured to operate with at least one relatively low power supply voltage, lower than the high power supply voltage in ...

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Номер записи: 21
14-11-2013 дата публикации

METHODS AND APPARATUS FOR PROCESSING AUDIO SIGNALS

Номер: US20130304459A1
Автор: BRAMSLØW Lars, LUNNER Thomas, PONTOPPIDAN Niels Henrik, VATTI Marianna
Принадлежит: OTICON A/S

A method for processing an audio signal (i(t)), comprises: receiving a first set (x(t)) of time-varying signals representing a first sound comprised in the audio signal (i(t)), the first set (x(t)) of time-varying signals comprising an amplitude modulation signal (a(t)), a carrier frequency signal (f(t)), a pitch signal (f(t)) and an FM index signal (h(t)); and modifying the first set (x(t)) of time-varying signals by modifying the amplitude of the FM index signal (h(t)), thereby providing a first modified set (x′(t)) of time-varying signals. The resulting first modified set (x′(t)) of time-varying signals may subsequently be modulated to provide an audio output signal. 1. Method for processing an audio signal (i(t)) , the method comprising: receiving a first set (x(t)) of time-varying signals representing a first sound comprised in the audio signal (i(t)) , the first set (x(t)) of time-varying signals comprising an amplitude modulation signal (a(t)) , a carrier frequency signal (f(0) , a pitch signal (f(t)) and an FM index signal (h(t)); and modifying the first set (x(t)) of time-varying signals by modifying the amplitude of the FM index signal (h(t)) , thereby providing a first modified set (x′(t)) of time-varying signals.2. Method according to claim 1 , wherein modifying the amplitude of the FM index signal (h(t)) comprises amplifying or attenuating the FM index signal (h(t)).3. Method according to claim 1 , and further comprising: providing a first modulated audio signal (s(t)) in dependence on the first modified set (x′(t)) of time-varying signals.4. Method according to claim 3 , and further comprising: providing an audible signal in dependence on the first modulated audio signal (s(t)).5. Method according to claim 1 , and further comprising: receiving the audio signal (i(t)); and demodulating the audio signal (i(t)) claim 1 , thereby providing the first set (x(t)) of time-varying signals.6. Method according to claim 4 , wherein modifying the first set (x(t)) ...

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Номер записи: 22
21-11-2013 дата публикации

Device For Adding Harmonics To Sound Signal

Номер: US20130308793A1
Автор: KAWAHARA Takehiko
Принадлежит: YAMAHA CORPORATION

In a harmonic adding device, an input/output function part converts a digital sound signal having an input signal level into a digital sound signal having an output signal level determined according to a input/output function and the input signal level. A parameter storage unit stores at least one inflection point. A controller sets the inflection point to the input/output function to enable the input/output function part to add harmonics to the digital sound signal. The input/output function is defined between a positive maximum point and a negative maximum point. The inflection point is set between the positive maximum point and the negative maximum point. The positive maximum point, the inflection point and the negative maximum point are sequentially connected by linear interpolation to formulate the input/output function. 1. A harmonic adding device comprising:an input/output function part that is set with an input/output function determining relationship between an input signal level and an output signal level, the input/output function part receiving a digital sound signal having an input signal level, converting the received digital sound signal into a digital sound signal having an output signal level determined according to the input/output function and the input signal level of the received digital sound signal, and outputting the converted digital sound signal having the determined output signal level;a parameter storage unit that is configured to store at least one inflection point set to the input/output function for enabling the input/output function part to add harmonics to the digital sound signal; anda controller that is configured to set the inflection point stored in the parameter storage unit to the input/output function of the input/output function part,wherein the input/output function is defined between a positive maximum point at which the output signal level represents a positive maximum value when the input signal level corresponds to a ...

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Номер записи: 23
05-12-2013 дата публикации

Power Supply Regulation for Programmable Gain Amplifier Used in a CMOS Image Sensor

Номер: US20130321083A1
Автор: Jack Zheng, Steven Huang
Принадлежит: Forza Silicon Corp

An image sensor array that uses an over saturation sensor to detect when one of the pixels is being oversaturated. When that happens, the power supply to that pixel is prevented from affecting power supplies to the other pixels, by regulating the power supply to the pixel.

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Номер записи: 24
16-01-2014 дата публикации

ENGINE SOUND SYNTHESIS SYSTEM

Номер: US20140016792A1
Автор: Christoph Markus
Принадлежит:

An engine sound synthesis system is operable to analyze sound. Operation of the system may include providing an input sound signal to be analysed and determining a fundamental frequency of the input signal from the input signal or from at least one guide signal. Furthermore, the frequencies of higher harmonics of the fundamental frequency are determined, thus determining harmonic model parameters. A harmonic signal based on the harmonic model parameters is synthesized and a residual signal is estimated by subtracting the harmonic signal from the input signal. Residual model parameters are estimated based on the residual signal. Furthermore, a corresponding method for synthesizing a sound signal is described. 1. A method for generating synthesized sound comprising:receiving an input signal with a processor;determining a fundamental frequency of the input signal with the processor using at least one of the input signal or at least one guide signal, and determining the frequencies of higher harmonics of the fundamental frequency with the processor, thus determining with the processor harmonic model parameters associated with the determined frequencies;synthesizing a harmonic signal with the processor based on the harmonic model parameters;determining a residual signal with the processor by subtracting the harmonic signal from the input signal;calculating residual model parameters with the processor based on the residual signal; andgenerating synthesized sound in accordance with the harmonic model parameters and the residual module parameters.2. The method of claim 1 , wherein the input signal is transformed to the frequency domain claim 1 , thus providing a frequency domain input signal before being further processed.3. The method of claim 2 , wherein the processing of the frequency domain input signal is fully performed in the frequency domain and thus the harmonic signal and the residual signal are calculated in the frequency domain.4. The method of claim 1 , wherein ...

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Номер записи: 25
13-02-2014 дата публикации

Active Instrument Subwoofer System for Low Frequency Enhancement

Номер: US20140044282A1
Автор: JR. James K., Waller, Waller Jon J.
Принадлежит:

An instrument amplification system provides improved low frequency enhancement. A powered subwoofer system enhances the low frequency components of a standard instrument amplifier by incorporating a speaker level high-pass filter crossover network prior to connection to a standard instrument speaker. The speaker level instrument amplifier output is also attenuated, low-pass filtered and re-amplified to drive a dedicated low frequency subwoofer speaker. In one embodiment, a single speaker cabinet connects via a single speaker cable and includes both typical instrument speakers and an active powered subwoofer system. In another embodiment, a stand alone active powered subwoofer connects to a standard instrument amplifier and includes a speaker level high-pass crossover output for connection to a standard instrument speaker cabinet. The instrument amplifier speaker output is attenuated, low-pass filtered, re-amplified and connected to a low frequency subwoofer speaker. A differential attenuator is incorporated allowing connection to instrument amplifiers with differential bridge outputs. 1. A method of enhancing the low frequency audio components of an instrument amplifier output signal comprising the steps of:applying the instrument amplifier output signal to an instrument speaker;attenuating the instrument amplifier output signal to produce a line level signal;low-pass filtering the line level signal to provide a filtered signal;amplifying the filtered signal to provide an amplified filtered signal; andapplying the amplified filtered signal to a low frequency speaker.2. A system for enhancing the low frequency audio components of an instrument amplifier output signal comprising:an instrument speaker receiving said instrument amplifier output signal;means for attenuating the instrument amplifier output signal to produce a line level signal;means for low-pass filtering said line level signal to provide a filtered signal;means for amplifying said filtered signal to ...

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Номер записи: 26
27-03-2014 дата публикации

System and Method for Determining Location of Submerged Submersible Vehicle

Номер: US20140085004A1
Автор: Ball Robert E., Carkhuff Bliss G., Hundley Nathaniel J., London Morris L., Mitchell James B.
Принадлежит: THE JOHNS HOPKINS UNIVERSITY

An amplifier for use in a buoyant cable antenna operable to receive signals within a frequency band includes: a first amplifier operable to provide amplified signals based on the received signals; a bandpass filter arranged to pass filtered signals within a first portion of the frequency band, the filtered signals being based on the amplified signals; an attenuator arranged in parallel with said bandpass filter and operable to attenuate signals within a second portion of the frequency band, the attenuated signals being based on the amplified signals; and a second amplifier operable to provide an amplified output including first amplified signals within the first portion of the frequency band and to provide second amplified signals within the second portion of the frequency band. The first amplified signals have a first gain, the second amplified signals have a second gain, and the first gain is more than the second gain. 1. An amplifier for use in a buoyant cable antenna operable to receive signals within a frequency band , said amplifier comprising:a first amplifier operable to provide amplified signals based on the received signals;a bandpass filter arranged to pass filtered signals within a first portion of the frequency band, the filtered signals being based on the amplified signals;an attenuator arranged in parallel with said bandpass filter and operable to attenuate signals within a second portion of the frequency band, the attenuated signals being based on the amplified signals; anda second amplifier operable to provide an amplified output including first amplified signals within the first portion of the frequency band and to provide second amplified signals within the second portion of the frequency band,wherein the first amplified signals have a first gain,wherein the second amplified signals have a second gain, andwherein the first gain is more than the second gain.2. The amplifier of claim 1 , further comprising:a combiner arranged to receive the filtered ...

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Номер записи: 27
03-04-2014 дата публикации

Amplifying loudspeaker apparatus

Номер: US20140093097A1
Автор: Zhang Michael Weibin
Принадлежит:

An amplifying loudspeaker apparatus for an existing host device comprises a sensor coil for receiving an audio signal in electromagnetic form from an internal loudspeaker of the host device; a pre-amplifier and equalizer module connected to the sensor coil for amplifying and equalizing the audio signal to a suitable level and frequency response; and an audio power amplifier and a loudspeaker to reproduce the sound for the audio signal. 1. An amplifying loudspeaker apparatus for an existing host device having not been designed or made to use inductive coupling via its internal loudspeaker for audio transmission , comprising: a sensor coil located close to said internal loudspeaker for receiving an audio signal in electromagnetic form from said internal loudspeaker; a pre-amplifier and equalizer module connected to said sensor coil for amplifying and equalizing said audio signal to a suitable level and frequency response; and an audio power amplifier and loudspeaker to reproduce a sound for said audio signal; a power module for supplying power.2. The apparatus according to claim 1 , comprising a CPU module connected with said pre-amplifier module and said audio power amplifier module for detecting if there is an audio signal received from said sensor coil and for turning said power amplifier module on or off according to the detection.3. The apparatus according to claim 1 , comprising two or more of said sensor coils to work with different kinds of existing host devices.4. The apparatus according to claim 3 , comprising a multi-channel switch for selection of the correct sensor coil or coils for a particular host device in a particular location.5. The apparatus according to claim 4 , wherein said multi-channel switch is a manual switch.6. The apparatus according to claim 4 , wherein said multi-channel switch is an electronic switch controlled by said CPU module.7. The apparatus according to claim 1 , wherein said sensor coil is removable so as to be positioned close ...

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Номер записи: 28
03-04-2014 дата публикации

User terminal apparatus, electronic device, and method for controlling the same

Номер: US20140093100A1
Автор: Dae-Yeon Jeong, Young-Sik Lee
Принадлежит: SAMSUNG ELECTRONICS CO LTD

A user terminal apparatus connected to an electronic device, and a method thereof, are provided. The apparatus includes a communicator that performs communication with the electronic device, an audio processor that processes an audio source to be transmitted to the electronic device, and a controller that adjusts a sound level of the audio source based on a reference volume unit of the electronic device, and controls the adjusted audio source to be transmitted to the electronic device in a streaming method.

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Номер записи: 29
01-01-2015 дата публикации

SYSTEMS AND METHODS FOR TRACKING AND PRESENTING TINNITUS THERAPY DATA

Номер: US20150003635A1
Автор: Baker Michael, Drexler Daniel, Edin Brenda
Принадлежит:

The treatment of tinnitus may include a tinnitus therapy including generating a tinnitus therapy sound that is similar to a patient's perceived tinnitus sound. In one example, a method for tinnitus therapy may include tracking a tinnitus therapy over a duration, the tinnitus therapy including a tinnitus therapy sound matching a patient's perceived tinnitus played over the duration and presenting each of a volume evolution of the tinnitus therapy sound and usage data of the tinnitus therapy over the duration. 1. A method for tinnitus therapy , comprising:tracking a tinnitus therapy over a duration, the tinnitus therapy including a tinnitus therapy sound matching a patient's perceived tinnitus played over the duration; andpresenting each of a volume evolution of the tinnitus therapy sound and usage data of the tinnitus therapy over the duration.2. The method of claim 1 , wherein tracking the tinnitus therapy over the duration includes tracking volume changes to the tinnitus therapy sound.3. The method of claim 2 , wherein tracking the tinnitus therapy over the duration includes tracking volume changes separately for a left ear input and a right ear input.4. The method of claim 1 , wherein the duration includes a series of sessions claim 1 , the tinnitus therapy sound played continuously for a prescribed amount of time during each session of the series of sessions.5. The method of claim 4 , wherein tracking the tinnitus therapy over the duration includes tracking one or more of a date claim 4 , time claim 4 , and duration of each session in the series of sessions.6. The method of claim 4 , wherein the usage data includes one or more of a total number of sessions in the series of sessions claim 4 , a date and time of a first session of the series of sessions claim 4 , a date and time of a last session of the series of sessions claim 4 , an average daily use claim 4 , an average weekly use claim 4 , and a length of each session.7. The method of claim 1 , wherein ...

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Номер записи: 30
21-01-2016 дата публикации

AMPLIFIER CONTROL SYSTEMS AND METHODS

Номер: US20160020731A1
Автор: Christmas Craig Joseph, Poulin Grant Darcy, Trainor Alan
Принадлежит:

A system improve amplifier efficiency of operation relative to that of an amplifier with fixed biasing and fixed matching conditions receives a power level and an indicator of amplifier operation. The indicator is at least one of channel, channel bandwidth, out-of band spectral requirements, spectral mask requirements, error vector magnitude, modulation rate, and modulation type. A controller generates a control signal based at least in part on the power level and the indicator to control at least one of the bias current and the matching conditions of matching circuits. The matching conditions and bias current for channels at an edge of a channel band are different from the bias current and matching conditions for channels nearer a center of the channel band. 1. An amplifier circuit comprising:an amplifying transistor configured to receive a first bias current; anda control circuit configured to determine the first bias current for the amplifying transistor based at least in part on an indication of amplifier operation, the first bias current being different for channels at an edge of a channel band than for channels nearer a center of the channel band.2. The amplifier circuit of wherein the first bias current is determined to improve an amplifier efficiency of operation relative to that of an amplifying transistor with a fixed bias current3. The amplifier circuit of wherein the indication of amplifier operation includes an error vector magnitude (EVM) target claim 1 , an operating point claim 1 , and an operating channel of the amplifier circuit.4. The amplifier circuit of wherein the first bias current is selected from a plurality of discrete bias currents claim 1 , each of the discrete bias currents being selected for a different range of operation of the amplifying transistor.5. The amplifier circuit of wherein the control circuit is further configured to provide the first bias current to the amplifying transistor through a control signal.6. The amplifier ...

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Номер записи: 31
17-04-2014 дата публикации

ASYMMETRIC POLYNOMIAL PSYCHOACOUSTIC BASS ENHANCEMENT

Номер: US20140105419A1
Автор: Vickers Earl Corban
Принадлежит: STMicroelectronics, Inc.

Psychoacoustic bass audio signal enhancement can be accomplished using a monotonic, asymmetric polynomial distortion. A non-linear process applies a monotonic, asymmetric polynomial distortion function that has continuous first and second derivatives to generate even and odd harmonics of missing fundamental frequencies. This polynomial distortion produces the desired psychoacoustic effect with a fairly rapid roll-off so as to avoid unpleasant aliasing. Moreover, the lack of first-order discontinuities prevents clicks or glitches. 1. A method for enhancing an audio signal , the method comprising:receiving a bass audio signal having a fundamental frequency;normalizing an amplitude of the bass audio signal;producing a plurality of harmonics using a monotonic, asymmetric fourth order polynomial distortion function.2. The method of wherein the monotonic claim 1 , asymmetric polynomial distortion function has continuous first and second derivatives.3. The method of wherein the monotonic claim 1 , asymmetric polynomial distortion function produces even and odd harmonics in response to a sinusoidal input.4. The method of wherein the monotonic claim 1 , asymmetric polynomial distortion function limits output amplitude.6. The method of such that ƒ(1)=kand ƒ(−1)=k.7. The method of wherein magnitudes of the positive clipping level kand the negative clipping level kare unequal claim 6 , |k|≠|k|.8. The method of wherein the monotonic claim 1 , asymmetric polynomial distortion function comprises a pair of fourth-order polynomials.10. The method of wherein responsive to producing the plurality of harmonics claim 1 , compensating for normalizing the signal.11. The method of wherein the monotonic claim 1 , asymmetric polynomial distortion function is constrained to pass through the origin claim 1 , ƒ(0)=0.12. The method of wherein the monotonic claim 11 , asymmetric polynomial distortion function is constrained to have a slope of unity as it passes through the origin claim 11 , such ...

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Номер записи: 32
25-01-2018 дата публикации

Selectable Programmable Gain Or Operational Amplifier

Номер: US20180026596A1
Автор: Bartling James E., Kris Bryan
Принадлежит: MICROCHIP TECHNOLOGY INCORPORATED

An integrated circuit amplifier configurable to be either a programmable gain amplifier or an operational amplifier comprises two output blocks, one output block is optimized for programmable gain amplifier operation, and the other output block is optimized for operational amplifier applications. A common single input stage, input offset calibration and bias generation circuits are used with either amplifier configuration. Thus duplication of the input stage, offset calibration and bias generation circuits are eliminated while still selectably providing for either a programmable gain amplifier or operational amplifier configuration. 1. A configurable amplifier , comprising:a differential input stage;a first output block;a second output block;a plurality of switches coupled to the differential input stage, the first output block and the second output block;at least one configuration line controlling a switching position of said plurality of switches; when a logic state on said configuration line defines a programmable gain amplifier setting, the plurality of switches are controlled such that the differential input stage and the first output block are coupled together as a programmable gain amplifier and comprises a feedback loop, wherein at least one switch of said plurality of switches changes a feedback resistance of the feedback loop, and', 'when another logic state of said configuration line defines an operational amplifier setting, the plurality of switches are controlled such that the differential input stage and the second output block are coupled together as an operational amplifier without a feedback loop., 'wherein'}2. The configurable amplifier according to claim 1 , wherein the first output block comprises a first intermediate stage and a first output stage claim 1 , and the second output block comprises a second intermediate stage and a second output stage.3. The configurable amplifier according to claim 1 , further comprising a bias circuit coupled to ...

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Номер записи: 33
10-02-2022 дата публикации

TWO-STAGE AUDIO GAIN CIRCUIT BASED ON ANALOG-TO-DIGITAL CONVERSION AND AUDIO TERMINAL

Номер: US20220045658A1
Автор: ALPMAN Erkan, DUSTER Jon Sweat, FENG Haigang, TAN Yulin, ZHANG Liuan, Zhang Ning
Принадлежит: Radiawave Technologies Co., Ltd.

Disclosed are a two-stage audio gain circuit based on analog-to-digital conversion and an audio terminal. The two-stage audio gain circuit includes a PGA configured to receive an analog audio signal and perform programmable gain amplification processing on the received analog audio signal; an ADC configured to convert the analog audio signal after the programmable gain amplification processing into a digital audio signal and output the digital audio signal; a first AGC gain unit configured to perform a first AGC processing on the digital audio signal and output a first gain adjustment value to the PGA, for the PGA to perform gain adjustment on the received analog audio signal; and a second AGC gain unit configured to perform a second AGC processing on the digital audio signal and output a second gain adjustment value to the PGA, for the PGA to perform gain adjustment on the received analog audio signal. 1. A two-stage audio gain circuit based on analog-to-digital conversion , comprising:a programmable gain amplifier (PGA) configured to receive an analog audio signal and perform programmable gain amplification processing on the received analog audio signal;an analog-to-digital converter configured to convert the analog audio signal after the programmable gain amplification processing into a digital audio signal and output the digital audio signal;a first automatic gain control (AGC) gain unit configured to perform a first AGC processing on the digital audio signal and output a first gain adjustment value to the PGA, for the PGA to perform gain adjustment on the received analog audio signal according to the first gain adjustment value; anda second AGC gain unit configured to perform a second AGC processing on the digital audio signal and output a second gain adjustment value to the PGA, for the PGA to perform gain adjustment on the received analog audio signal according to the second gain adjustment value.2. The two-stage audio gain circuit based on analog-to-digital ...

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Номер записи: 34
04-02-2016 дата публикации

PROGRAMMABLE GAIN AMPLIFIERS WITH OFFSET COMPENSATION AND TOUCH SENSOR CONTROLLER INCORPORATING THE SAME

Номер: US20160034094A1
Автор: Choi Michael, CHOI Yoon-kyung, KANG Sang-Hyub, KIM Ki-Duk, Lee Choong-Hoon, LEE Jin-Chul, LEE Kyung-Hoon, Lee Min-chul, Park Ho-Jin, PARK Jun-Chul
Принадлежит:

A programmable gain amplifier (PGA) circuit includes a first input resistor coupled between a first input node and a first summing node and a second input resistor coupled between a second input node and a second summing node. The PGA circuit further includes a first variable reference resistor coupled between a third input node and the first summing node, a second variable reference resistor coupled between a fourth input node and the second summing node, and an operational amplifier having first and second inputs coupled to respective ones of the first and second summing nodes and first and second outputs coupled to respective ones of the first and second output nodes. At least of the first and second reference resistors may include an R-2R ladder circuit. 1. A programmable gain amplifier (PGA) circuit comprising:a first input resistor coupled between a first input node and a first summing node;a second input resistor coupled between a second input node and a second summing node;a first feedback resistor coupled between the first summing node and a first output node;a second feedback resistor coupled between the second summing node and a second output node;a first reference resistor coupled between a third input node and the first summing node;a second reference resistor coupled between a fourth input node and the second summing node; andan operational amplifier having an input coupled to the first and second summing nodes and an output coupled to the first and second output nodes, wherein at least one of the first and second reference resistors comprises an R-2R ladder circuit.2. The PGA circuit according to claim 1 , wherein the first and second input resistors have the same resistance value.3. The PGA circuit according to claim 1 , wherein a positive input voltage is applied to the first input node claim 1 , a negative input voltage is applied to the second input node claim 1 , and a difference between the positive input voltage and the negative input voltage ...

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Номер записи: 35
05-02-2015 дата публикации

Distortion compensating apparatus and distortion compensation method

Номер: US20150035608A1
Автор: Takeshi Takano, Takumi Miyashita
Принадлежит: Fujitsu Ltd

A distortion compensating apparatus includes: a memory; and a processor coupled to the memory and configured to: calculate a transient response of a power source circuit, in accordance with an estimated value of a current to be consumed by an amplifier based on a signal to be amplified by the amplifier, and in accordance with an objective supply voltage, based on the signal, of a voltage to be supplied to the amplifier from the power source circuit, and correct the signal to be input to the amplifier based on a difference caused by the transient response from the objective supply voltage.

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Номер записи: 36
01-05-2014 дата публикации

SPEECH CODING SYSTEM AND METHOD USING BI-DIRECTIONAL MIRROR-IMAGE PREDICTED PULSES

Номер: US20140119572A1
Автор: GAO Yang
Принадлежит: O'HEARN AUDIO LLC

A method of decoding speech data generated from a speech signal includes receiving the speech data having at least one main pulse in a subframe of the speech data, and generating a first predicted pulse, based on the at least one main pulse, on one side of the main pulse in the subframe of the speech data, where the first predicted pulse has a lower gain than the main pulse. The method also includes generating a second predicted pulse, as a mirror image of the first predicted pulse on a reverse time scale, on the other side of the main pulse in the subframe of the speech data, and reconstructing the speech signal using the at least one main pulse, the first predicted pulse and the second predicted pulse. 1. A method , comprising:receiving, at a computing device, an input audio signal including a zero level, wherein the input audio signal comprises a plurality of audio frames;determining, by the computing device, that at least one frame of the plurality of audio frames has a volume level within a selected range of the zero level; andmodifying, by the computing device, the volume level of the at least one frame to correspond to the zero level of the input audio signal.2. The method of claim 1 , wherein the determining includes comparing the volume level of the at least one frame to one or more quantization levels.3. The method of claim 1 , wherein the selected range includes one or more quantization levels claim 1 , wherein the one or more quantization levels correspond to quantization levels of pulse code modulation (PCM).4. The method of claim 1 , further comprising:tracking, by the computing device, the zero level adaptively by using the modified volume level of the at least one frame as a feedback.5. The method of claim 4 , wherein the tracking the zero level adaptively includes using a minimum resolution.6. The method of claim 1 , wherein the determining includes determining whether the volume level is within two quantization levels of the zero level.7. The ...

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Номер записи: 37
19-02-2015 дата публикации

GAIN CONTROL CIRCUIT AND METHOD CAPABLE OF EASING LEAKAGE CURRENT INFLUENCE

Номер: US20150048885A1
Автор: Chiang Ming-Cheng, Hsu Yuan-Ping, Kao Li-Lung
Принадлежит:

The present invention discloses a gain control circuit capable of easing leakage current influence. According to an embodiment of the present invention, the gain control circuit comprises: at least one signal input end for receiving at least one input signal; a signal output end for outputting an output signal; an amplifier coupled between an amplifier input end and the signal output end; and a plurality of gain schemes. Each of the gain schemes is set between the at least one signal input end and the signal output end; and when one of the gain schemes is activated to generate the output signal, the rest gain schemes are inactivated to stop gain production and concurrently discharge leakage currents through their respective grounding paths. 1. A gain control circuit capable of easing leakage current influence , comprising:at least one signal input end operable to receive at least one input signal;a signal output end operable to output an output signal;an amplifier coupled between an amplifier input end and the signal output end; and [ a first node;', 'a first signal path operable to electrically connect or disconnect the at least one signal input end with or from the amplifier input end through the first node according to a first control signal; and', 'a first grounding path operable to electrically connect or disconnect the first node with or from a reference voltage end according to the inversion of the first control signal, and especially operable to disconnect the first node from the reference voltage end when the first signal path electrically connects the at least one signal input end with the amplifier input end through the first node; and, 'a first gain scheme including, a second node;', 'a second signal path operable to electrically connect or disconnect the at least one signal input end with or from the amplifier input end through the second node according to a second control signal; and', 'a second grounding path operable to electrically connect or ...

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Номер записи: 38
19-02-2015 дата публикации

Low Delay Real-to-Complex Conversion in Overlapping Filter Banks for Partially Complex Processing

Номер: US20150049880A1
Автор: MUNDT Harald, VILLEMOES Lars
Принадлежит: DOLBY INTERNATIONAL AB

An arrangement of overlapping filter banks comprises a synthesis stage and an analysis stage. The synthesis stage receives a first signal segmented into time blocks and outputs, based thereon, an intermediate signal to be received by the analysis stage forming the basis for the computation of a second signal segmented into time frames. In an embodiment, the synthesis stage is operable to release an approximate value of the intermediate signal in a time block located L−1 time blocks ahead of its output block, which approximate value is computed on the basis of any available time blocks of the first signal, so that the approximate value contributes, in the analysis stage, to the second signal. The delay is typically reduced by L−1 blocks. Applications include audio signal processing in general and real-to-complex conversion in particular. 122-. (canceled)23. An audio processing system comprising a multiband filter for providing a partially complex frequency-domain representation of a signal , the multiband filter comprising:a synthesis stage receiving a first subband range of a first frequency-domain representation of a signal, the first frequency-domain representation being segmented into time blocks and comprising first spectral components representing spectral content of the signal in the first subband range expressed in a first subspace of a multidimensional space, and outputting, based on the first subband range, an intermediate time-domain representation of the signal;an analysis stage receiving the intermediate time-domain representation of the signal and outputting, based thereon, a second frequency-domain representation of the signal, the second frequency-domain representation being segmented into time blocks and comprising second spectral components representing spectral content of the signal in the first subband range expressed in a second subspace of the multidimensional space that includes a portion of the multidimensional space not included in the first ...

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Номер записи: 39
15-02-2018 дата публикации

Analog signal automatic gain control over copper pairs

Номер: US20180048274A1
Автор: Ponganis Edward P., Scheans Daryl, St-Jacques Sylvain
Принадлежит:

An apparatus and method to automatically adjust a gain of an analog signal adapted to be transmitted over a twisted pair of telephone lines between a first end (e.g., a DSLAM), and a second end (e.g., a modem), is described. The apparatus comprises an amplifier, and a control mechanism. The amplifier receives the analog signal from a respective first or second end, and transmits the received analog signal in the respective downstream or upstream direction. The control mechanism, which preferably is operative only during a train or re-train mode, senses whether the analog signal is within a specified amplitude range associated with a receiver at the respective second end or first end, and, responsive to a determination that the analog signal is not within the specified amplitude range, determines and generates a control signal. The control signal is operative to adjust a gain of the amplifier to a determined value. 1. Apparatus to automatically adjust a gain of an analog signal adapted to be transmitted over a twisted pair of telephone lines between a first end that is a Digital Subscriber Line Access Multiplexer (DSLAM) , and a second end , wherein signaling between the first end and the second end is in a downstream direction , and wherein signaling between the second end and the first end is in an upstream direction , comprising:an amplifier that receives the analog signal from a respective first or second end, calibrates the analog signal to generate a calibrated analog signal, and transmits the calibrated analog signal in the respective downstream or upstream direction; anda control mechanism including a sensing circuit operative during a train or re-train mode associated with the DSLAM to receive the calibrated analog signal from the amplifier and to sense whether the calibrated analog signal is within a specified amplitude range associated with a receiver at the respective second end or first end, and, responsive to a determination that the calibrated analog ...

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Номер записи: 40
26-02-2015 дата публикации

POWER AMPLIFIER

Номер: US20150054583A1
Автор: Miyashita Miyo, Takahashi Yoshinori, Yamamoto Kazuya
Принадлежит: Mitsubishi Electric Corporation

A power amplifier includes: a first transistor having a gate, a drain, and a source that is grounded; a second transistor having a gate, a drain, and a source that is connected to the drain of the first transistor; a capacitor connected between the gate of the second transistor and a grounding point; an idling current control circuit having a positive temperatures coefficient and making an idling current flowing through the first transistor proportional to an ambient temperature; and a drain voltage control circuit having a positive temperature gradient coefficient and making a drain voltage on the first transistor proportional to the ambient temperature. 1. A power amplifier comprising:a first transistor having a gate, a drain and a source that is grounded;a second transistor having a gate, a drain and a source that is connected to the drain of the first transistor;a capacitor connected between the gate of the second transistor and a grounding point;an idling current control circuit having a positive temperature coefficient and making an idling current flowing through the first transistor proportional to an ambient temperature; anda drain voltage control circuit having a positive temperature coefficient and making a drain voltage on the first transistor proportional to the ambient temperature.2. The power amplifier according to claim 1 , wherein the drain voltage control circuit supplies a voltage proportional to the ambient temperature to the gate of the second transistor.3. The power amplifier according to claim 1 , wherein the drain voltage control circuit supplies a body voltage proportional to the ambient temperature to a substrate of the second transistor.4. The power amplifier according to claim 1 , further comprising a third transistor having a gate claim 1 , a source connected to the drain of the first transistor claim 1 , and a drain connected to the drain of the second transistor claim 1 , wherein the drain voltage control circuit supplies a voltage ...

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Номер записи: 41
14-02-2019 дата публикации

VARIABLE GAIN CIRCUIT AND TRANSIMPEDANCE AMPLIFIER USING THE SAME

Номер: US20190052236A1
Автор: ITABASHI Naoki, SUGIMOTO Yoshiyuki
Принадлежит: Sumitomo Electric Industries, Ltd.

A transimpedance amplifier includes a variable gain circuit configured to generate a pair of complementary signals in accordance with an input signal and a reference signal. A first differential circuit of the variable gain circuit includes a first transistor including a control terminal to receive the input signal, a second transistor including a control terminal to receive the reference signal, and a variable resistance circuit including a first field effect transistor (FET) and a second FET. A first timing when a voltage of a first linearity adjustment signal input to the first FET reaches a first threshold voltage of the first FET and a second timing when a voltage of a second linearity adjustment signal input to the second FET reaches a second threshold voltage of the second FET are different from each other. 1. A transimpedance amplifier , comprising:a variable gain circuit configured to generate a pair of complementary signals in accordance with an input signal and a reference signal, the complementary signals including a first complementary signal and a second complementary signal; anda linearity control circuit configured to generate a plurality of linearity adjustment signals to secure linearity of the variable gain circuit,wherein the variable gain circuit includesa first current source configured to supply a first current,a second current source configured to supply a second current,a first differential circuit configured to divide each of the first current and the second current into two parts in accordance with the input signal and the reference signal to generate a first current signal and a second current signal,a first load element configured to generate the first complementary signal based at least in part on the first current signal, anda second load element configured to generate the second complementary signal based at least in part on the second current signal,wherein the first differential circuit includesa first transistor including a control ...

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Номер записи: 42
15-05-2014 дата публикации

CIRCUIT, TRANSCEIVER AND MOBILE COMMUNICATION DEVICE

Номер: US20140133526A1
Автор: Belitzer Alexander, Camuffo Andrea, Sogl Bernhard
Принадлежит:

A circuit for providing a bias signal for a power amplifier includes a first input, a second input and an output. The first input is configured to receive an input signal to be amplified by the power amplifier. The second input is configured to receive the amplified input signal. The output is configured to provide the bias signal. 1. A circuit for providing a bias signal for a power amplifier , the circuit comprising:a first input configured to receive an input signal to be amplified by the power amplifier,a second input configured to receive the amplified input signal, andan output configured to provide the bias signal.2. The circuit according to claim 1 , the circuit comprising:a bias modifier configured to vary the bias signal for the power amplifier based on the input signal;a feedback receiver configured to determine an information describing the amplified input signal; andan adjuster configured to adjust a distortion compensation rule based on the information describing the amplified input signal, which is provided by the feed-back receiver, to counteract or compensate a distortion of the amplified input signal.3. The circuit according to claim 2 , wherein the adjuster is configured to adjust the distortion compensation rule to counteract or compensate a distortion of the amplified input signal induced by the bias signal variation.4. The circuit according to claim 2 ,wherein the bias modifier is configured to perform an envelope tracking (ET) modulation,wherein the feedback receiver and the adjuster are configured to perform an amplitude modulation (AM), andwherein the adjuster is configured to adjust the distortion compensation rule to counteract or compensate a distortion of the amplified input signal induced by a time misalignment between the amplitude modulation (AM) and the envelope tracking (ET) modulation.5. The circuit according to claim 2 ,wherein the adjuster is configured to adjust a bias modification rule, andwherein the bias modifier is ...

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Номер записи: 43
05-03-2015 дата публикации

CLOSED LOOP CONTROL SYSTEM, AND AN AMPLIFIER IN COMBINATION WITH SUCH A CLOSED LOOP CONTROL SYSTEM

Номер: US20150061769A1
Автор: Bodnar Rares Andrei, Bourke Donal, Pratt Patrick Joseph, Tonge Peter James
Принадлежит:

A control apparatus is provided that can provide high dynamic resolution and is suitable for inclusion within an integrated circuit. The control apparatus receives a demand signal representing a desired value of a measurand, and a feedback signal representing a present value or a recently acquired value of the measurand. The processing circuit forms a further signal a further signal which is a function of the demand and feedback signals. The further signal is then subjected to at least an integrating function. The demand signal, feedback signal or the further signal is processed or acquired in a sampled manner. The use of such sampled, i.e. discontinuous, processing allows integration time constants to be synthesized which would otherwise require the use of unfeasibly large components within an integrated circuit, or the use of off-chop components. Both of these other options are expensive. 1. A control circuit comprising a processing circuit configured to receive a demand signal representing a desired value of a measurand , and a feedback signal representing the measurand , wherein the processing circuit is configured to perform at least an integrating function based on a further signal formed as a function of the demand and feedback signals , and wherein the at least one of the demand signal , the feedback signal or the further signal is processed or acquired in a sampled manner.2. A control circuit as claimed in claim 1 , in which the processing circuit has a first input for receiving the demand signal claim 1 , and wherein the demand signal is updated in a discontinuous manner claim 1 , and a time period between updates is T claim 1 , and wherein a sampling circuit within the control circuit is configured to sample the demand signal or the further signal every T claim 1 , where Tis less than T.3. A control circuit as claimed in claim 1 , in which the processing circuit comprises an integrator configured to perform the integrating function claim 1 , and a switch ...

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Номер записи: 44
05-03-2015 дата публикации

Digital Receiver System Activated by RSSI Signal

Номер: US20150063504A1
Автор: Chen Chun-Chin, Fan Yiping, Huang Sheng-Chia, Lin Chun-Yuan
Принадлежит: UNIBAND ELECTRONIC CORP.

A digital receiver includes a radio frequency analog front end, a digital processing unit, a plurality of cascaded amplifier stages configured to receive output of the radio frequency analog front end, a first analog to digital converter configured to convert an analog signal output from the plurality of cascaded amplifier stages into a digital signal output to the digital processing unit, a first received signal strength indicator unit configured to receive outputs of each of the plurality of cascaded amplifier stages and output signal to the digital processing unit, a second received signal strength indicator unit configured to receive output of at least one amplifier stage in the plurality of cascaded amplifier stages, and a received signal strength indicator detection unit configured to activate and to deactivate digital units according to a comparison of output from the second received signal strength indicator unit to a predetermined threshold. 1. A digital receiver comprising:a radio frequency analog front end;a digital processing unit;a plurality of cascaded amplifier stages configured to receive output of the radio frequency analog front end;a first analog to digital converter configured to convert an analog signal output from the plurality of cascaded amplifier stages into a digital signal output to the digital processing unit;a first received signal strength indicator unit configured to receive outputs of each of the plurality of cascaded amplifier stages and output signal to the digital processing unit;a second received signal strength indicator unit configured to receive output of at least one amplifier stage in the plurality of cascaded amplifier stages; anda received signal strength indicator detection unit configured to activate and to deactivate the digital processing unit according to a comparison of output from the second received signal strength indicator unit to a predetermined threshold.2. The digital receiver of wherein the received signal ...

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Номер записи: 45
05-03-2015 дата публикации

SOUND CONTROL FOR NETWORK-CONNECTED DEVICES

Номер: US20150063598A1
Автор: Shah Tejash Rajnikant
Принадлежит: QUALCOMM INCORPORATED

A first device receives a sound suppression message from a second device via a communication network. The sound suppression message indicates that the second device will produce an audible sound. The first device determines a sound profile associated with the second device. The first device then modifies (e.g., suppresses or reduces) a volume of sound that that the first device (or a third device) produces in response to receiving the sound suppression request message and based, at least in part, on the sound profile associated with the second device. The sound profile can include a device identifier associated with classes, models, and makes of devices. 1. A method comprising:receiving, at a first device from a second device, a first message that at least indicates a first frequency of a first sound of the second device;determining whether a second sound produced by the first device could interfere or interferes with the first sound based, at least in part, on the first frequency, after receiving the first message; andmodifying the second sound to avoid interfering or to no longer interfere with the first sound in response to determining that the second sound could interfere or interferes with the first sound.2. The method of claim 1 , wherein modifying the second sound comprises suppressing the second sound or reducing volume of the second sound.3. The method of claim 1 , wherein the first message further indicates at least one member selected from the group consisting of a volume of the first sound claim 1 , a duration of the first sound claim 1 , and a type of the second device.4. (canceled)5. (canceled)6. (canceled)7. (canceled)8. (canceled)9. (canceled)10. (canceled)11. The method of claim 1 , wherein the first sound is an alarm associated with the second device.12. (canceled)13. (canceled)14. (canceled)15. (canceled)16. (canceled)17. (canceled)18. (canceled)19. (canceled)20. (canceled)21. A method comprising:transmitting, by a first device, a sound profile ...

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Номер записи: 46
05-03-2015 дата публикации

Gain Control for a Hearing Aid with a Facial Movement Detector

Номер: US20150063615A1
Автор: KeeHyun Park, Kuntal Dilipsinh Sampat
Принадлежит: Qualcomm Inc

Methods, systems and devices are provided for controlling a hearing aid. Embodiments include receiving an input audio signal from a microphone. Also, a facial movement indication may be received from a facial movement detector measured contemporaneously with the input audio signal. Additionally, whether a first movement pattern associated with the wearer speaking is a movement match to the facial movement indication may be determined. In this way, a first gain profile may be applied to the input audio signal for generating an augmented audio segment in response to determining the first movement pattern is the movement match to the facial movement indication. Also, a second gain profile may be applied to the input audio signal for generating the augmented audio segment in response to determining the first movement pattern does not match the facial movement indication. Thus, the augmented audio segment may be output.

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Номер записи: 47
22-05-2014 дата публикации

Dynamic Speaker Management for Multichannel Audio Systems

Номер: US20140140535A1
Автор: DOY Anthony S., Nigam Vivek P., Polleros Robert
Принадлежит: MAXIM INTEGRATED PRODUCTS, INC.

A multiband limiter with selective sideband linking includes first and second frequency band splitters, a first and second plurality of limiters, first and second summers, and a plurality of selectable links coupling the first plurality of limiters to the second plurality of limiters. The first plurality of limiters each have a band input coupled to one of the first plurality of band outputs, a link port and a limiter output, and the first summer is receptive to the limiter outputs of the first plurality of limiters and has a first channel output. The second plurality of limiters each have a band input coupled to one of the second plurality of band outputs, a link port and a limiter output, and the second summer is receptive to the limiter outputs of the second plurality of limiters and has a second channel output. 1. A multiband limiter with selective sideband linking comprising:a first frequency band splitter having a first channel input and a first plurality of frequency band outputs;a first plurality of limiters each having a band input coupled to one of the first plurality of band outputs, a link port and a limiter output;a first summer receptive to the limiter outputs of the first plurality of limiters and having a first channel output;a second frequency band splitter having a second channel input and a second plurality of frequency band outputs;a second plurality of limiters each having a band input coupled to one of the second plurality of band outputs, a link port and a limiter output;a second summer receptive to the limiter outputs of the second plurality of limiters and having a second channel output; anda plurality of selectable links coupling link ports of the first plurality of limiters to link ports of the second plurality of limiters.2. A multiband limiter with selective sideband linking as recited in wherein the plurality of selectable links comprises a plurality of switches.3. A multiband limiter with selective sideband linking as recited in ...

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Номер записи: 48
29-05-2014 дата публикации

AUDIO SYSTEM

Номер: US20140146981A1
Автор: GAUTAMA Temujin
Принадлежит: NXP B.V.

An audio system includes a channel () for processing signals. The channel () includes a processing module () that follows a chain of modules () wherein the chain () includes a preceding processing module (). The following processing module () is coupled to the preceding processing module () in the chain of modules () for receiving the output signal (). The channel () further includes a combiner (). The combiner () has two inputs, a first input () receives the signal () to be processed in the channel (), and a second input () receives a reference signal (). The combiner () further includes an output () coupled to an input of the preceding processing module () in the chain (). By coupling a combination of the signal () to be processed and the reference signal () to the input () of the preceding processing module () in the chain () and by having a correction signal () from the processing unit () generated in response to a modification of the reference signal () in the output signal () of the preceding processing module () in the chain (), the amount and type of processing in the preceding processing module () in the chain () can be estimated in the processing unit () and be corrected for in the following processing module (). 1. An audio system including a channel for processing signals , the channel comprising:a preceding processing module,a following processing module being coupled to the preceding processing module for receiving an output signal from the preceding processing module,a combiner having a first input receiving a signal to be processed by the channel, a second input for receiving a reference signal and having an output coupled to an input of the preceding processing module, anda processing unit for receiving the output signal, wherein the processing unit is configured for generating a correction signal in response to a modification of the reference signal in the output signal and wherein the following processing module is configured for changing a ...

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Номер записи: 49
10-03-2016 дата публикации

SYSTEMS AND METHODS FOR GAIN CALIBRATION OF AN AUDIO SIGNAL PATH

Номер: US20160072465A1
Автор: Burk Ted, Das Tejasvi, Fei Xiaofan, He Ku, Melanson John L., ZHAO XIN
Принадлежит:

A signal path may operate in one of a plurality of gain modes such that for each gain mode, the product of a digital gain and an analog signal gain of the signal path associated with the particular gain mode are approximately equal to a fixed path gain. During each of one or more calibration phases, a calibration system may measure analog signals at a plurality of nodes of the first path portion, calculate an actual analog gain associated with the gain mode based on the analog signals measured at the plurality of nodes, calculate an error between the fixed path gain and a mathematical product of the actual analog gain associated with the gain mode and the digital gain associated with the gain mode, and modify at least one of the digital gain and the analog gain associated with the gain mode in conformity with the error. 1. An integrated circuit , comprising: a first path portion comprising an amplifier having an audio input for receiving an analog input signal, an audio output for providing an output signal, and an analog gain selected from a plurality of analog gains in accordance with a gain mode, and configured to generate the output signal based on the analog input signal and in conformity with the analog gain; and', 'a second path portion having a digital gain selected from a plurality of digital gains in accordance with the gain mode and configured to convert a digital audio input signal into the analog input signal in conformity with the digital gain;', 'wherein the gain mode is selected from a plurality of gain modes such that for each particular gain mode of the plurality of gain modes, the product of the digital gain associated with the particular gain mode and the analog signal gain associated with the particular gain mode are approximately equal to a fixed path gain; and, 'a signal path comprising measure analog signals at a plurality of nodes of the first path portion;', 'calculate an actual analog gain associated with the gain mode based on the analog ...

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Номер записи: 50
28-02-2019 дата публикации

DC Offset Calibration Circuit

Номер: US20190068176A1
Автор: Chan Ka-Un, Chang Yi-Shao
Принадлежит:

A DC offset calibration circuit for calibrating DC offset with multi-level method includes analog DC offset cancellation unit and digital DC offset cancellation unit, wherein analog DC offset cancellation unit includes first amplifier and integrator, first amplifier receives analog signal with DC offset, and transmits to integrator, and integrator transmits first feedback signal to first amplifier to output amplified signal with fixed DC offset, and digital DC offset cancellation unit includes comparator, digital circuit, digital-to-analog converter and second amplifier, where second amplifier receives amplified signal with fixed DC offset and transmits to comparator for determining DC offset value and transmitting to digital circuit, digital circuit generates logical result according to DC offset value and transmits to digital-to-analog converter, and therefore digital-to-analog converter accordingly generates second feedback signal to second amplifier, to calibrate DC offset value on second amplifier. 1. A DC offset calibration circuit , for calibrating DC offset with multi-level method , comprising:an analog DC offset cancellation unit, comprising an analog integrator and a first amplifier, wherein the first amplifier is utilized for receiving an analog signal with a DC offset, and the analog integrator is utilized for receiving an output signal of the first amplifier and outputting a first feedback signal to the first amplifier, whereby the first amplifier outputs an amplified signal with fixed DC offset; anda digital DC offset cancellation unit, coupled to the analog DC offset cancellation unit, for receiving the amplified signal with fixed DC offset from the analog DC offset cancellation unit, and comprising a comparator, a digital circuit, a digital-to-analog converter and a second amplifier, wherein the second amplifier is utilized for receiving the amplified signal with fixed DC offset, the comparator receives an output signal of the second amplifier for ...

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Номер записи: 51
19-03-2015 дата публикации

CURRENT-FEEDBACK OPERATIONAL AMPLIFIER

Номер: US20150077183A1
Автор: Ciubotaru Alexandru A.
Принадлежит: ANALOG DEVICES, INC.

An integrated, fully-differential current-feedback transimpedance operational amplifier circuit is disclosed. The circuit can be configured as a class-AB, low-impedance input stage, followed by an inverter-based, rail-to-rail output stage. For enhancing the open-loop transimpedance gain of the amplifier without consuming additional DC power, the same bias current is used both in the input stage and in a gain-enhancement stage serving as its load. The gain-enhancement stage can be either DC- or AC-coupled to the input of the amplifier. In the case of DC coupling, an output common-mode feedback loop can be used to provide the proper operating voltages in the amplifier. 1. An apparatus comprising an operational amplifier , the operational amplifier comprising:an input stage configured to receive a differential input current at an input port and to generate a first voltage signal, the differential current corresponding to a difference between a first input current at a non-inverting input node and a second input current at an inverting input node, the input stage comprising a first input transistor, a second input transistor, a third input transistor, and a fourth input transistor; anda gain-enhancement stage comprising a first gain-enhancement transistor, a second gain-enhancement transistor, a third gain-enhancement transistor, and a fourth gain-enhancement transistor;the first and third input transistors and the third and fourth gain-enhancement transistors comprising a first semiconductor type, and the second and fourth input transistors and the first and second gain-enhancement comprising a second semiconductor type complementary to the first semiconductor type;wherein a source of the first input transistor, a source of the second input transistor, a gate of the second gain-enhancement transistor, and a gate of the fourth gain-enhancement transistor are operatively coupled to the non-inverting input node, and wherein a source of the third input transistor, a source ...

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Номер записи: 52
07-03-2019 дата публикации

Speaker Distortion Reduction

Номер: US20190075395A1
Автор: HATAB Ziad, LINDEMANN Eric
Принадлежит: Cirrus Logic International Semiconductor Ltd.

A spectral tilt of an audio signal is used to determine whether a speaker will introduce perceptible distortion during playback of the audio signal. The spectral tilt may be indicated by determining a ratio between energy in a distortion-producing frequency band and energy in a distortion-masking frequency band. Based on the determined spectral tilt, the distortion-producing frequency band may be attenuated to reduce the distortion introduced by the speaker. Additionally, the distortion-masking frequency band may be amplified to reduce perceptibility of the distortion produced by the speaker. 1. A method for reducing perceived audio distortion in a loudspeaker in response to an input audio signal , the method comprising:determining a first signal level of a distortion-producing frequency band of the input audio signal;determining a second signal level of a distortion-masking frequency band of the input audio signal; andattenuating the signal level in an attenuation frequency band of the input audio signal to produce a modified audio signal based, at least in part, on the signal level of the distortion-producing frequency band and on the signal level of the distortion-masking frequency band.2. The method of claim 1 , wherein the step of attenuating the signal level comprises determining a ratio between the second signal level and the first signal level.3. The method of claim 2 , wherein the distortion-producing frequency band comprises an entire audio spectrum claim 2 , and wherein the ratio is a ratio of high-frequency energy in the distortion-masking frequency band to all energy in the input audio signal.4. The method of claim 1 , wherein a frequency range of the distortion-producing frequency band is centered at a resonant frequency of the loudspeaker.5. The method of claim 4 , wherein the loudspeaker is a microspeaker with a resonant frequency in the 300 Hz to 1500 Hz range.6. The method of claim 1 , wherein a frequency range of the distortion-masking frequency ...

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Номер записи: 53
17-03-2016 дата публикации

SYSTEMS AND METHODS FOR REDUCTION OF AUDIO ARTIFACTS IN AN AUDIO SYSTEM WITH DYNAMIC RANGE ENHANCEMENT

Номер: US20160080865A1
Автор: Das Tejasvi, He Ku, Melanson John L.
Принадлежит:

In accordance with embodiments of the present disclosure, a control circuit may be configured to, responsive to an indication to switch between gain modes of a signal path having an analog path portion and a digital signal path portion, switch a selectable analog gain of the analog path portion between a first analog gain and a second analog gain, switch a selectable digital gain of the digital signal path portion between a first digital gain and a second digital gain, wherein the product of the first analog gain and the first digital gain is approximately equal to the product of the second analog gain and the second digital gain, and control an analog response of the signal path to reduce the occurrence of audio artifacts present in the output signal as a result of the switch between gain modes of the signal path. 127.-. (canceled)28. An apparatus for providing an output signal to an audio transducer , comprising: an analog signal path portion having an audio input for receiving an analog input signal, an audio output for providing the output signal, and a selectable analog gain, and configured to generate the output signal based on the analog input signal and in conformity with the selectable analog gain; and', [ a loop filter configured to generate a filtered signal responsive to the digital audio input signal and a feedback signal; and', 'a quantizer responsive to the filtered signal and configured to generate a quantized signal; and, 'a forward path comprising, 'a feedback path configured to generate the feedback signal responsive to the quantized signal, wherein the feedback path includes a first gain element having a selectable first digitally-controlled gain such that a signal gain of the modulator is inversely proportional to the selectable analog gain; and, 'a digital signal path portion having a selectable digitally-controlled gain and configured to convert a digital audio input signal into the analog input signal in conformity with the selectable ...

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Номер записи: 54
12-06-2014 дата публикации

AMPLIFIER AND OPTICAL RECEIVER

Номер: US20140158866A1
Автор: Oku Hideki
Принадлежит: FUJITSU LIMITED

An amplifier circuit includes: a first transistor and a second transistor of which collectors/drains are coupled to a first power-source via a first load-impedance-element and the first power-source via a second load-impedance-element, respectively; a gain-adjustment-resistance-element that is connected to an emitter/source of the first transistor and an emitter/source of the second transistor; a first current-source and a second current-source that are connected to the emitters/the sources of the first transistor and the second transistor respectively, and a second power-source; a third transistor and a fourth transistor of which collectors/drains are connected to the first power-source and bases/gates are connected to the first load-impedance-element and the second load-impedance-element, respectively; a first feedback-resistance-element that is connected to a base/gate of the first transistor and an emitter/source of the third transistor; and a second feedback-resistance-element that is connected to a base/gate of the second transistor and an emitter/source of the fourth transistor. 1. An amplifier circuit , comprising:a first transistor of which a collector or a drain is coupled to a first power source via a first load impedance element;a second transistor of which a collector or a drain is coupled to the first power source via a second load impedance element;a gain adjustment resistance element that is connected to an emitter or a source of the first transistor and an emitter or a source of the second transistor;a first current source that is connected to the emitter or the source of the first transistor and a second power source;a second current source that is connected to the emitter or the source of the second transistor and the second power source;a third transistor of which a collector or a drain is connected to the first power source and a base or a gate is connected to the first load impedance element;a fourth transistor of which a collector or a drain ...

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Номер записи: 55
12-06-2014 дата публикации

AMPLIFIER CIRCUIT

Номер: US20140159816A1
Автор: Lesso John Paul
Принадлежит: Wolfson Microelectronics plc

An amplifier circuit comprises an input, for receiving an input signal to be amplified; a preamplifier, for amplifying the input signal based on a variable gain; a power amplifier for amplifying the signal output from the preamplifier; and a variable voltage power supply for supplying one or more supply voltages to the power amplifier. The supply voltages are adjusted based on the variable gain or the input digital signal. According to other aspects of the invention, a power supply of an amplifier circuit is clocked using a clock signal, whereby the clock signal has a frequency that varies in accordance with a volume signal or an input signal. 1. An amplifier circuit for amplifying an input signal and outputting an output signal , said input signal being amplified by a variable gain , said gain being controlled by a received volume signal , said circuit comprising;an amplifier for outputting said output signal; anda variable voltage power supply for supplying supply voltages to the amplifier, said supply voltages being variable based on a control signal,wherein the variable voltage power supply is a charge pump having flying capacitor terminals for connecting at least one flying capacitor and is operable, in use with just a single flying capacitor connected to said flying capacitor terminals, in first and second modes, wherein in the first mode the charge pump generates first positive and first negative supply voltages each substantially equal in magnitude to the magnitude of the input voltage and in the second mode the charge pump generates second positive and second negative output voltages each substantially equal in magnitude to half the magnitude of the input voltage, and wherein the charge pump selectively operates in said first mode or said second mode based on said control signal;wherein said control signal is based on at least one of the input signal and said received volume signal.2. An amplifier circuit as claimed in claim 1 , further comprising:an ...

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Номер записи: 56
12-06-2014 дата публикации

AUDIO SIGNAL CORRECTION AND CALIBRATION FOR A ROOM ENVIRONMENT

Номер: US20140161280A1
Автор: Nackvi Fawad
Принадлежит: AMX, LLC

Disclosed are an apparatus and method of processing an audio signal to optimize audio for a room environment. One example method of operation may include recording the audio signal generated within a particular room environment and processing the audio signal to create an original frequency response based on the audio signal. The method may also include creating at least two iterative filters based on at least two separate frequency ranges of the original frequency response, calculating an error difference between the frequency response modified by the at least two iterative filters and the original frequency response, and applying the error difference to the audio signal. 1. A method of processing an audio signal , the method comprising:recording the audio signal generated within a particular room environment;processing the audio signal to create an original frequency response based on the audio signal;creating at least two iterative filters based on at least two separate frequency ranges of the original frequency response;calculating an error difference between the frequency response modified by the at least two iterative filters and the original frequency response; andapplying the error difference to the audio signal.2. The method of claim 1 , wherein the original frequency response is generated based on an actual room measurement derived from at least one of multi-point averaging claim 1 , minimum phase calculations claim 1 , windowing claim 1 , logarithmic smoothing claim 1 , and subtracting microphone reference signals.3. The method of claim 1 , further comprising:processing the original frequency response to separate a range of lower frequencies within the original frequency response from a range of higher frequencies within the original frequency response, and wherein creating the at least two iterative filters further comprises creating at least one first iterative filter for the range of higher frequencies and at least one second iterative filter for the ...

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Номер записи: 57
12-06-2014 дата публикации

METHOD AND AN APPARATUS FOR PROCESSING AN AUDIO SIGNAL

Номер: US20140161285A1
Автор: JUNG Yang Won, OH Hyen O
Принадлежит: LG ELECTRONICS INC.

A method of processing an audio signal, and which includes a receiving object information including object level information indicating a level of objects, object gain information and object correlation information; receiving preset presence information and preset number information; receiving preset information based on the preset presence information and the preset number information by an audio decoding apparatus, the preset information including preset metadata representing an attribute mode of the preset information, preset rendering data and preset type information indicating whether the preset rendering data is in a matrix type or not obtaining a preset matrix from the preset rendering data by the audio decoding apparatus, and generating a processed audio signal by controlling a gain or panning of the at least one object included in the audio signal based on the downmix processing information. 1. A method of processing an audio signal , the method comprising:receiving the audio signal, wherein the audio signal includes a plurality of objects;receiving object information including object level information indicating a level of the plurality of objects, object gain information indicating gains of each of the plurality of objects, and object correlation information indicating correlation between objects;receiving preset presence information and preset number information, the preset presence information indicating the preset information is available, and the preset number information indicating a number of the preset information;receiving preset information based on the preset presence information and the preset number information by an audio decoding apparatus, the preset information including preset metadata representing an attribute mode of the preset information, preset rendering data for rendering the plurality of objects and preset type information indicating whether the preset rendering data is in a matrix type or not;obtaining a preset matrix from the ...

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Номер записи: 58
14-03-2019 дата публикации

FEMTOWATT NON-VACUUM TUBE DETECTOR ASSEMBLY

Номер: US20190081603A1
Автор: Martinez Marcelo, Mohan Karan
Принадлежит:

In one embodiment, a femtowatt sensitivity optical detector is provided using one or more photodiodes, intended as a replacement for the photomultiplier based photon counting unit. 114-. (canceled)15. A device comprising:a plurality of photodiodes;an analog amplification system comprising at least a high gain transimpedance amplifier (TIA) and at least a buffer on each of said photodiodes, followed by a fully differential amplifier to combine outputs of multiple TIAs; anda digital acquisition system comprising at least one analog-to-digital converter (ADC), followed by a programmable processor, which is linked to a central processor as well as on-board memory,wherein the programmable processor implements a data acquisition algorithm, wherein the programmable processor implements the data acquisition algorithm using a long time average.16. The device of further comprising a mechanical housing module of the analog amplification system are contained.17. The device of wherein the device has femtowatt sensitivity.18. The device of further comprising multiple digital-to-analog converters (DACs) on the programmable processor configured to provide feedback control19. The device of wherein one of said DACs is configured for offset adjustment in the differential amplifier claim 18 , and one of said DACs is set the reference level of the ADC.20. The device of further comprising at least one shaped reflector to direct light to at least one of said photodetectors.21. The device of wherein the shaped reflector has a semi-hemispherical shape.22. The device of wherein the shaped reflector comprises at least one opening sized and positioned to allow a sample vessel to be placed at a desired location in a cavity defined at least in part by the shaped reflector. Photomultiplier tubes (PMTs for short), members of the class of vacuum tubes, and more specifically vacuum phototubes, are extremely sensitive detectors of light in the ultraviolet, visible, and near-infrared ranges of the ...

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Номер записи: 59
14-03-2019 дата публикации

Apparatus and method for centrally controlling common mode voltages for a set of receivers

Номер: US20190081604A1
Автор: Pradeep Thiagarajan, Todd Morgan Rasmus, Xiaobin Yuan
Принадлежит: Qualcomm Inc

A differential signal processing circuit includes a local common mode voltage control circuit for controlling a common mode voltage of an output differential signal generated by the differential signal processing circuit based on an external common mode control current generated by an external common mode voltage control circuit. The differential signal processing circuit, which may be configured as a variable gain amplifier (VGA) or a continuous time linear equalizer (CTLE), includes a pair of load devices, a pair of input transistors, and a pair of current source transistors coupled via separate paths between upper and lower voltage rails. The external control circuit includes a replica circuit including a replica load device, a replica input transistor, and a replica current source transistor. The external control circuit sets the replica common mode voltage to a target using a current, wherein the external common mode control current is based on that current.

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Номер записи: 60
02-04-2015 дата публикации

PULSED DYNAMIC LOAD MODULATION POWER AMPLIFIER CIRCUIT

Номер: US20150091649A1
Автор: Jeon Moon-Suk, KIM Jung Hyun, Kwon Young, PARK Sung-Hwan, Woo Jung-Rin
Принадлежит: Avago Technologies General IP (Singapore) Pte. Ltd

A power amplifier circuit for amplifying an envelope modulated Radio Frequency (RF) signal with improved linearity and efficiency includes a power amplifier, and a variable load matching circuit coupled to an output port of the power amplifier. The input impedance of the variable load matching circuit is changed such that an output power of the power amplifier is at a first output power level, or a second output power level which is higher than the first output power level. 1. A power amplifier circuit , comprising:a power amplifier configured to amplify an envelope modulated radio frequency (RF) signal; anda variable load matching circuit coupled to an output port of the power amplifier, the variable load matching circuit configured to have an input impedance that is changeable so that an output power of the power amplifier changes between a first output power level and a second output power level which is higher than the first output power level.2. The power amplifier circuit of claim 1 , wherein the variable load matching circuit is configured so that the input impedance is high when the output power of the power amplifier is at the first output power level and low when the output power of the power amplifier is at the second output power level.3. The power amplifier circuit of claim 1 , wherein the variable load matching circuit comprises a shunt capacitor and a switch configured to switch the shunt capacitor.4. The power amplifier circuit of claim 1 , further comprising an attenuator coupled to an input port of the power amplifier claim 1 , the attenuator configured to change a gain of the power amplifier so that the power amplifier operates in a saturation region.5. The power amplifier circuit of claim 4 , wherein the attenuator comprises a gain adjusting circuit including a shunt resistor and a switch configured to switch the shunt resistor.6. The power amplifier circuit of claim 4 , wherein the attenuator comprises:a power limiter configured to limit power ...

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Номер записи: 61
19-06-2014 дата публикации

INDEPENDENT GAIN CONTROL FOR MULTIPLE RECEIVE CIRCUITS CONCURRENTLY PROCESSING DIFFERENT TRANSMITTED SIGNALS

Номер: US20140170999A1
Автор: Aparin Vladimir
Принадлежит: QUALCOMM INCORPORATED

Techniques for simultaneously receiving multiple transmitted signals with independent gain control are disclosed. In an exemplary design, an apparatus (e.g., a wireless device, an integrated circuit, etc.) includes a low noise amplifier (LNA) and first and second receive circuits. The LNA amplifies a receiver input signal and provides (i) a first amplified signal for a first set of at least one transmitted signal being received and (ii) a second amplified signal for a second set of at least one transmitted signal being received. The first receive circuit scales the first amplified signal based on a first adjustable gain selected for the first set of transmitted signal(s). The second receive circuit scales the second amplified signal based on a second adjustable gain selected for the second set of transmitted signal(s). The first and second adjustable gains may be independently selected, e.g., based on the received powers of the transmitted signals. 1. An apparatus comprising:a low noise amplifier (LNA) configured to simultaneously provide a first amplified signal on a first output for a first set of at least one transmitted signal being received and a second amplified signal on a second output for a second set of at least one transmitted signal being received;a first receive circuit configured to scale the first amplified signal based on a first adjustable gain; anda second receive circuit configured to scale the second amplified signal based on a second adjustable gain.2. The apparatus of claim 1 , the first adjustable gain being selected for the first set of at least one transmitted signal claim 1 , and the second adjustable gain being selected for the second set of at least one transmitted signal.3. The apparatus of claim 1 , the first receive circuit comprising a first gain control circuit configured to scale the first amplified signal based on the first adjustable gain claim 1 , and the second receive circuit comprising a second gain control circuit configured ...

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Номер записи: 62
25-03-2021 дата публикации

FEMTOWATT NON-VACUUM TUBE DETECTOR ASSEMBLY

Номер: US20210091737A1
Автор: Martinez Marcelo, Mohan Karan
Принадлежит:

In one embodiment, a femtowatt sensitivity optical detector is provided using one or more photodiodes, intended as a replacement for the photomultiplier based photon counting unit. 114-. (canceled)15. A method comprising: using an analog amplification system comprising at least a high gain transimpedance amplifier (TIA) and at least a buffer on each of said photodiodes, followed by a fully differential amplifier to combine outputs of multiple TIAs; and', 'using a digital acquisition system on said signal comprising at least one analog-to-digital converter (ADC), followed by a programmable processor to detect, which is linked to a central processor as well as on-board memory, wherein the programmable processor implements a data acquisition algorithm, wherein the programmable processor implements the data acquisition algorithm using a long time average., 'detecting a signal at femtowatt sensitivity by using a plurality of photodiodes to collect light emitted from a sample to generate said signal and then amplifying said signal by16. The method of further comprising containing said analog amplification system in a mechanical housing module.17. The method of wherein the sample comprises a blood sample.18. The method of further comprising using multiple digital-to-analog converters (DACs) on the programmable processor configured to provide feedback control19. The method of wherein one of said DACs is configured for offset adjustment in the differential amplifier claim 18 , and one of said DACs is set the reference level of the ADC.20. The method of further comprising using at least one shaped reflector to direct light to at least one of said photodetectors.21. The method of wherein the shaped reflector has a semi-hemispherical shape.22. The method of wherein the shaped reflector comprises at least one opening sized and positioned to allow a sample vessel to be placed at a desired location in a cavity defined at least in part by the shaped reflector. Photomultiplier tubes ...

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Номер записи: 63
31-03-2016 дата публикации

SELECTABLE PROGRAMMABLE GAIN OR OPERATIONAL AMPLIFIER

Номер: US20160094193A1
Автор: Bartling James E., Kris Bryan
Принадлежит: MICROCHIP TECHNOLOGY INCORPORATED

An integrated circuit amplifier configurable to be either a programmable gain amplifier or an operational amplifier comprises two output blocks, one output block is optimized for programmable gain amplifier operation, and the other output block is optimized for operational amplifier applications. A common single input stage, input offset calibration and bias generation circuits are used with either amplifier configuration. Thus duplication of the input stage, offset calibration and bias generation circuits are eliminated while still selectably providing for either a programmable gain amplifier or operational amplifier configuration. 1. A configurable amplifier , comprising:a differential input stage;a first output block;a second output block;a plurality of switches coupled to the differential input stage, the first output block and the second output block; the differential input stage and the first output block are coupled together as a programmable gain amplifier when certain ones of the plurality of switches are arranged in a first mode, and', 'the differential input stage and the second output block are coupled together as an operational amplifier when the certain ones of the plurality of switches are arranged in a second mode., 'wherein'}2. The configurable amplifier according to claim 1 , wherein the first output block comprises a first intermediate stage and a first output stage claim 1 , and the second output block comprises a second intermediate stage and a second output stage.3. The configurable amplifier according to claim 1 , further comprising a bias circuit coupled to the differential input stage.4. The configurable amplifier according to claim 3 , wherein the bias circuit has a first set of bias parameters for the programmable gain amplifier configuration when in the first mode claim 3 , and a second set of bias parameters for the operational amplifier configuration when in the second mode.5. The configurable amplifier according to claim 4 , wherein ...

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Номер записи: 64
30-03-2017 дата публикации

LOUDSPEAKER PROTECTION CIRCUITRY AND METHODS

Номер: US20170094408A1
Автор: Lawrence Jason William, NAPOLI Roberto
Принадлежит: Cirrus Logic International Semiconductor Ltd.

This application relates to methods and apparatus for thermal protection of a loudspeaker (). A controller () is configured to generate a control signal (G) for modulating the gain of a signal processing chain () that drives the loudspeaker. The controller is configured such that the control signal is generated as a function of each of: an indication of voice coil temperature of the loudspeaker (T); an indication of power dissipation in the voice coil of the loudspeaker (P); and an indication of a reservoir temperature (T) of a thermal reservoir for heat flow from the voice coil. The reservoir temperature may be an ambient temperature of the environment or a temperature of a component of the loudspeaker or apparatus that acts as a heat sink. 1. A system for thermal protection of a loudspeaker comprising:a controller configured to generate a control signal for modulating the gain of a signal processing chain driving said loudspeaker, an indication of voice coil temperature of the loudspeaker;', 'an indication of power dissipation in the voice coil of the loudspeaker; and', 'an indication of a reservoir temperature of a thermal reservoir for heat flow from the voice coil., 'wherein said controller is configured such that the control signal is generated as a function of each of2. A system as claimed in wherein the controller comprises;a power limit module configured to determine an allowed power function of an allowed power dissipation with voice coil temperature based on said indication of a reservoir temperature; anda gain calculation module configured to determine a gain setting based on the indication of voice coil temperature, the indication of power dissipation in the voice coil and the allowed power function,wherein said control signal is based on said gain setting.3. A system as claimed in wherein the power limit module is configured to determine the allowed power function such that the allowed power dissipation at a maximum allowed temperature of the voice ...

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Номер записи: 65
26-06-2014 дата публикации

PORTABLE ELECTRONIC DEVICE WITH COMBINATION BUTTON FOR POWER AND VOLUME AND OPERATING METHOD

Номер: US20140177873A1
Автор: CHANG CHIH-WEI, LI XIAO-SHAN
Принадлежит:

A portable electronic device includes a combination button and a gravity sensor. The gravity sensor detects gravity variation of the portable electronic device. When the combination button is pressed for a first predetermined time, the gravity sensor begins. When the combination button is pressed within a second predetermined time and the gravity sensor detects no gravity variation, the combination button's power switch function shuts down the portable electronic device. If the gravity sensor detects a gravity variation, the combination button's volume adjusting function can increase or decrease the volume of the portable electronic device according to the gravity variation. 1. A portable electronic device , comprising:a combination button; anda gravity sensor,wherein the combination button is pressed for a first predetermined time, the gravity sensor detects a gravity variation of the portable electronic device; when the combination button is pressed within a second predetermined time, and when the gravity sensor detects no gravity variation, the combination button shuts down the portable electronic device; when the gravity sensor detects a gravity variation, the combination button increases or decreases a volume of the portable electronic device according to the gravity variation.2. The portable electronic device of claim 1 , further comprising a first end and a second end opposite to the first end claim 1 , a display claim 1 , and an earphone claim 1 , wherein the display and the earphone are arranged on a front surface of the portable electronic device claim 1 , the earphone is arranged on the first end claim 1 , the gravity sensor is arranged on the second end claim 1 , the combination button is arranged on a sidewall and on the first end.3. The portable electronic device of claim 2 , wherein when the second end of the portable electronic device rotates counter to a gravity direction claim 2 , the gravity sensor detects a gravity increment and a displacement of ...

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Номер записи: 66
26-06-2014 дата публикации

Method and apparatus for switching between a directly connected an a networked audio source

Номер: US20140177875A1
Автор: Millington Nicholas A.J.
Принадлежит: Sonos, Inc.

A system is described for maintaining synchrony of operations among a plurality of devices that have independent clocking arrangements. The system includes a task distribution device that distributes tasks to a synchrony group comprising a plurality of devices that are to perform the tasks distributed by the task distribution device in synchrony. The task distribution device distributes each task to the members of the synchrony group over a network. Each task is associated with a time stamp that indicates a time, relative to a clock maintained by the task distribution device, at which the members of the synchrony group are to execute the task. Each member of the synchrony group periodically obtains from the task distribution device an indication of the current time indicated by its clock, determines a time differential between the task distribution device's clock and its respective clock and determines therefrom a time at which, according to its respective clock, the time stamp indicates that it is to execute the task. 120-. (canceled)21. An audio playback device comprising:an audio information source interface configured to receive first information from an audio information source directly connected to the audio playback device;an analog to digital converter (ADC) configured to sample the first audio information;a network interface configured to receive from a network audio information source packets containing second audio information and playback timing information;a digital to analog converter (DAC) configured to generate an analog audio signal based on one of the first audio information or the second audio information;an audio amplifier connected to the DAC and configured to amplify the analog audio signal;an audio reproduction device interface connected to the audio amplifier; anda control module configured to receive one or more commands and to provide to the DAC, based on the one or more commands, one of the first audio information or the second audio ...

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Номер записи: 67
03-07-2014 дата публикации

CURRENT CANCELING GAIN CONTROL FOR HIGH FREQUENCY WIDEBAND CROSS-COUPLED AMPLIFIERS

Номер: US20140184329A1
Автор: Goldberger Eyal, Shoham Doron
Принадлежит:

An embodiment of the present invention provides a configuration of a cross-coupled common-source differential amplifier stage which enables performing a gain step down (attenuation) while maintaining good step flatness over a large relative bandwidth. 1. A circuit to amplify a differential input signal , the circuit comprising:a plurality of input stages each having cross-coupled transistors, and first and second transistors coupled as a common source differential pair to cooperate in amplifying the differential input signal; anda controller operable to apply a mode signal to the cross-coupled transistors of at least one input stage to selectively activate the at least one input stage in a first mode or to selectively deactivate the at least one input stage in a second mode;wherein gain and an attenuation provided by the at least one input stage is dependent on an applied mode signal.2. The circuit in accordance to claim 1 , wherein the first mode is a gain attenuation mode.3. The circuit in accordance to claim 2 , wherein the second mode is a full gain mode.4. The circuit in accordance to claim 2 , wherein the controller is configured to turn ON the cross-coupled transistors and turn OFF the common source (CS) differential pair at the at least one input stage in the gain attenuation mode.5. The circuit in accordance to claim 3 , wherein the controller is configured to turn OFF the cross-coupled transistors and turn ON the common source differential pair at the at least one input stage in the full gain mode.6. The circuit in accordance to claim 3 , wherein the transistors at the plurality of input stages are of the same size.7. The circuit in accordance to claim 3 , wherein the gain attenuation is caused by the cross-coupled transistors at the at least one input stage carrying an opposite phase current that resists a main current.8. The circuit in accordance to claim 3 , wherein the controller is at least one of multiplexer claim 3 , digital-to-analog converter ...

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Номер записи: 68
03-07-2014 дата публикации

TIME GAIN COMPENSATION

Номер: US20140184330A1
Автор: Dusad Shagun
Принадлежит: TEXAS INSTRUMENTS INCORPORATED

In certain embodiments, circuits and methods for time gain compensation are provided. A circuit includes a first op-amp that is configured to compare a first and a second input voltage signal received from first and second input circuits, respectively, and output a first op-amp output signal. A control circuit coupled with a first semiconductor element of the second input circuit is configured to vary a first resistance value of the first semiconductor element to control the first op-amp output signal. The first op-amp output signal includes a relatively high voltage signal and a relative low voltage signal when an input control voltage signal corresponds to a first reference voltage and a second reference voltage signal, respectively associated with the first op-amp. The first op-amp output signal is input to a gate terminal of a load semiconductor element so-as to vary an impedance of the load semiconductor element. 1. A circuit for time gain compensation comprising:a first op-amp comprising an output terminal, the first op-amp configured to conduct a comparison between first and second input voltage signals and output a first op-amp output signal based on the comparison;a first input circuit coupled with the first op-amp and configured to provide the first input voltage signal to the first op-amp, the first input signal being generated based on signal levels of an input control voltage signal and a first reference voltage signal;a second input circuit comprising a first semiconductor element, the second input circuit coupled with the output terminal, the second input circuit configured to provide the second input voltage signal to the first op-amp, the second input voltage signal being generated based on signal levels of the first op-amp output signal and a relatively high voltage signal; anda control circuit coupled with the first semiconductor element and configured to vary a first resistance value of the first semiconductor element to thereby control the first ...

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Номер записи: 69
03-07-2014 дата публикации

HIGH SPEED RECEIVERS CIRCUITS AND METHODS

Номер: US20140185661A1
Автор: CHANG KEVIN, GIACONI Stefano
Принадлежит:

The present invention provides GPA embodiments. In some embodiments, a GPA stage with a negative capacitance unit is provided. 1. A chip , comprising: (I) a source-degenerative trans-conductance stage (SDG-Gm) having an input to be a GPA stage input;', '(ii) a trans-impedance amplifier (Tia) having an output to be a GPA stage output; and', '(iii) a negative capacitance unit (NCU) to couple the SDG-Gm to the Tia., 'a gain peaking amplifier (GPA) stage including'}2. The chip of claim 1 , in which the Tia comprises at least one LC resonant circuit.3. The chip of claim 2 , in which the at least one LC resonance circuit comprises a dual resonant (LC-LC) circuit coupled to the SDG-Gm as part of a negative feedback path from the Tia to the SDG-Gm.4. The chip of claim 1 , in which the negative cap. unit comprises (i) cross-coupled transistors each having an output claim 1 , and (ii) a capacitor coupled between the transistor outputs.5. The chip of claim 4 , in which the Tia comprises first and second inverters claim 4 , each having a dual resonant circuit (LC-LC) coupled between an input and output of the inverter.6. The chip of claim 5 , in which the cross-coupled transistors of the NCU has inputs that are coupled to the Tia inverter inputs.7. The chip of claim 1 , in which the GPA stage is one of three GPA stages cascaded together to form a composite GPA amplifier.8. The chip of claim 7 , in which the NCU in each stage serves to cancel capacitance on an inside node at an output of the SDG-Gm circuit.9. The chip of claim 8 , in which the NCU in each stage has a controlled current source coupled as a load for an associated SDG-Gm.10. The chip of claim 7 , in which the composite GPA is configured as a Cherry-Hooper amplifier.11. The chip of claim 7 , in which the composite GPA has at least one control for controlling output offset for at least one of the GPA stages.12. The chip of claim 11 , in which the at least one control is to control a current level in the NCU for the ...

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Номер записи: 70
03-07-2014 дата публикации

SYSTEM AND METHOD FOR VARIABLE DECORRELATION OF AUDIO SIGNALS

Номер: US20140185811A1
Автор: Stein Edward, Walsh Martin
Принадлежит: DTS, INC.

Various embodiments relate to a system and method for decorrelating an audio signal with a hybrid filter. The hybrid filter is generated by first generating a decorrelation filter. A frequency-dependent warping is applied to the decorrelation filter. The warped decorrelation filter is then mixed with a carrier filter to generate the hybrid filter. The carrier filter may include filters for spatial processing of an audio signal, filters for upmixing an audio signal, and/or filters for downmixing an audio signal. 1. A method for decorrelating an audio signal , comprising:generating a decorrelation filter;applying a frequency-dependent warping to the decorrelation filter to generate a warped decorrelation filter;mixing the warped decorrelation filter with a carrier filter to generate a hybrid filter; andprocessing an audio signal with the hybrid filter.2. The method of claim 1 , wherein generating a decorrelation filter comprises:generating a sequence of random numbers;computing a fast Fourier transform (FFT) for the sequence of random numbers;normalizing the magnitude of the FFT of the sequence of random numbers to unity; andcomputing an inverse FFT of the normalized sequence of random numbers.3. The method of claim 1 , wherein the frequency-dependent warping applies a frequency-dependent weighting to the phase of the decorrelation filter.4. The method of claim 3 , wherein the frequency-dependent weighting decreases for higher frequencies.5. The method of claim 1 , wherein mixing the carrier filter with the warped decorrelation filter comprises:subtracting the phase of the warped decorrelation filter from the phase of the carrier filter to generate a hybrid filter phase.6. The method of claim 5 , further comprising:generating the hybrid filter by combining the magnitude of the carrier filter with the hybrid filter phase.7. The method of claim 1 , wherein the carrier filter comprises:at least one binaural room impulse response (BRIR) filter.8. The method of claim 1 , ...

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Номер записи: 71
13-04-2017 дата публикации

FEMTOWATT NON-VACUUM TUBE DETECTOR ASSEMBLY

Номер: US20170104464A1
Автор: Martinez Marcelo, Mohan Karan
Принадлежит:

In one embodiment, a femtowatt sensitivity optical detector is provided using one or more photodiodes, intended as a replacement for the photomultiplier based photon counting unit. 114-. (canceled)15. A device comprising:a plurality of photodiodes;an analog amplification system comprising at least a high gain transimpedance amplifier (TIA) and at least a buffer on each of said photodiodes, followed by a fully differential amplifier to combine outputs of multiple TIAs; anda digital acquisition system comprising at least one analog-to-digital converter (ADC), followed by a programmable processor, which is linked to a central processor as well as on-board memory,wherein the programmable processor implements a data acquisition algorithm.16. The device of further comprising a mechanical housing module of the analog amplification system are contained.17. The device of wherein the programmable processor implements the data acquisition algorithm using a long time average.18. The device of further comprising multiple digital-to-analog converters (DACs) on the programmable processor configured to provide feedback control19. The device of wherein one of said DACs is configured for offset adjustment in the differential amplifier claim 18 , and one of said DACs is set the reference level of the ADC.20. The device of further comprising at least one shaped reflector to direct light to at least one of said photodetectors.21. The device of wherein the shaped reflector has a semi-hemispherical shape.22. The device of wherein the shaped reflector comprises at least one opening sized and positioned to allow a sample vessel to be placed at a desired location in a cavity defined at least in part by the shaped reflector.23. The device of wherein the programmable processor implements the data acquisition algorithm using Butterworth filtering.24. The device of wherein the programmable processor implements the data acquisition algorithm using Kalman filtering.25. The device of wherein the ...

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Номер записи: 72
26-03-2020 дата публикации

FULLY-DIFFERENTIAL PROGRAMMABLE GAIN AMPLIFIER

Номер: US20200099353A1
Автор: DANYUK Dimitri, EICHENBAUM Todd A.
Принадлежит: HARMAN INTERNATIONAL INDUSTRIES, INCORPORATED

A programmable a fully-differential programmable gain amplifier for reducing distortion, switching transients and interference, and improving bandwidth. In one embodiment, the amplifier includes a programmable gain module, an amplifier coupled to the current mode outputs and a data latch circuit of the programmable gain module, the amplifier configured to apply common mode voltage to the data latch circuit, and a current-to-voltage converter. In one embodiment, the fully-differential programmable gain amplifier controls distortion and switching interference during amplification by sensing common mode signals to produce an error signal, and applying the resulting error signal to the programmable gain module for multiplying digital to analog conversion. Components of the fully-differential programmable gain amplifier provide compensation of distortion caused by nonlinearity of device switches and switch resistance, and can include a floating supply, galvanic isolation of control signals and a common mode voltage controller. 1. A fully-differential programmable gain amplifier comprising:a first input;a second input;a first output;a second output; [ control a first set of switches for a first resistive ladder network to provide output to a first current mode output, and', 'control a second set of switches for a second resistive ladder network to provide output to a second current mode output;, 'a data latch circuit configured to'}, 'an amplifier coupled to the first current mode output, the second current mode output, and the data latch circuit, the amplifier configured to apply common mode voltage to the data latch circuit; and', receive at least one output current mode signal from the first current mode output and the second current mode output, and', 'produce an output signal by converting differential input received from the at least one output current mode signal from the first current mode output and the second current mode output., 'a current-to-voltage converter ...

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Номер записи: 73
07-05-2015 дата публикации

POWER TRANSFERRING HEADPHONES

Номер: US20150124993A1
Автор: Saideh Isaac
Принадлежит:

The invention relates to headphones which can facilitate the transfer of electrical power from the headphones' internal power source to other devices. A pair of headphones can connect to a device through a modified cable. The modified cable triggers the transfer of electrical power to the device. A pair headphones may have a modified port which, when connected to the device through a non-modified or regular cable, causes the transfer of power from the headphones. A power management component connected to the internal power source of the headphones helps control or regulate the transfer of power transfer to and from the headphones. 1. A headphone device , comprising:a first speaker unit for providing audio output;a second speaker unit for providing audio output and connected to the first speaker unit with a band;an internal power source disposed in an interior portion of the headphone device;one or more powered components electrically coupled with the internal power source to receive electrical power from the internal power source;a port located on one of the first speaker unit and the second speaker unit, and in electrical communication with the internal power source; andan internal power management component operatively connected between the internal power source and the port, the internal power management component configured to cause electrical power to flow from the internal power source through the port.2. The headphone device of claim 1 , wherein the one or more powered components comprise a wireless communication receiver.3. The headphone device of claim 1 , wherein the one or more powered components comprise an amplifier.4. The headphone device of claim 1 , wherein the internal power management component is configured to control an output voltage of the internal power source.5. The headphone device of claim 1 , wherein the port is configured to receive a first end of an electrical cable with a second end connectable to an external device.6. The headphone ...

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Номер записи: 74
07-05-2015 дата публикации

METHODS, SYSTEMS, AND COMPUTER READABLE MEDIA FOR SYNTHESIZING SOUNDS USING ESTIMATED MATERIAL PARAMETERS

Номер: US20150124999A1
Автор: Lin Ming, Ren Zhimin, Yeh Hengchin
Принадлежит:

The subject matter described herein includes methods, systems, and computer readable media for synthesizing sounds using estimated material parameters. According to one aspect, a method for sound synthesis using estimated material parameters is provided. The method includes at a computing platform including a memory and a processor, estimating, by the processor and based on a recorded audio sample of an impact on a physical object, one or more material parameters of a physical object for use in synthesizing a sound associated with a virtual object having material properties similar to the physical object. The method further includes storing the one or more material parameters in memory. The method further includes using the estimated material parameters to generate a synthesize sound for the virtual object 1. A method for sound synthesis using estimated material parameters , the method comprising: estimating, by the processor and based on a recorded audio sample of an impact on a physical object, one or more material parameters of the physical object for use in synthesizing a sound associated with a virtual object having material properties similar to the physical object;', 'storing the one or more material parameters in the memory; and', 'using the estimated material parameters to generate a synthesized sound for the virtual object., 'at a computing platform including a memory and a processor2. The method of wherein estimating the one or more material parameters of the physical object includes extracting a set of damped sinusoids from the recorded audio sample.3. The method of wherein extracting the set of damped sinusoids comprises:computing a set of multi-level power spectrograms for the recorded audio sample;identifying potential modes by searching through each level of the multi-level power spectrograms for local maxima; andfor each potential mode, estimating a frequency and damping value by performing a local shape fitting around the local maximum.4. The ...

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Номер записи: 75
07-05-2015 дата публикации

Audio Device and Method Having Bypass Function for Effect Change

Номер: US20150125001A1
Автор: Shimizu Atsushi
Принадлежит:

When an effect parameter of an effector is changed, if only a switching operation is provided to bypass the original audio signals, which are input signals of the effector, during the period required for making that change, the output sound level may drastically change before and after the switching causing one to feel a sense of discomfort. In order to eliminate such a drawback, a gain adjustment circuit is provided in a bypass channel that outputs the original audio signals by bypassing the effector. The gain adjustment circuit is controlled in accordance with a rate of the output signal level of the effector and the original audio signal level, and the output signal level of the bypass channel is adjusted thereby. Consequently, a fluctuation in the output sound level before and after switching of the output signals can be eliminated. 1. An audio device comprising:an audio signal processor configured to process an original audio signal input thereto to impart at least one of various effects to the input audio signal, and output the processed audio signal;a bypass channel configured to transfer the original audio signal without being processed by the audio signal processor;a gain adjustment circuit provided in the bypass channel;a gain setting circuit configured to set a gain of the gain adjustment circuit in accordance with a ratio of input and output signal levels of the audio signal processor; andan output controller configured to select output signals from at least one of the audio signal processor and the bypass channel.2. The audio device according to claim 1 , wherein the gain setting circuit is configured to set the gain of the gain adjustment circuit so that a sound pressure level of an output signal output from the bypass channel claim 1 , for which gain adjustment has been made by the gain adjustment circuit claim 1 , approaches a sound pressure level of an output signal output from the audio signal processor.3. The audio device according to claim 1 , ...

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Номер записи: 76
17-07-2014 дата публикации

METHOD FOR IMPROVING TX GAIN IN ENVELOPE TRACKING SYSTEMS

Номер: US20140199949A1
Автор: Black Gregory R., Goedken Ryan J., Nagode Thomas D.
Принадлежит: MOTOROLA MOBILITY LLC

A method and system enhances the gain of a propagation path of a radio frequency (RF) signal while utilizing an envelope tracking (ET) mechanism to provide power to a power amplifier within the propagation path. An envelope tracking (ET) controller detects using the ET mechanism an RF envelope of the RF signal being propagated towards the power amplifier. The ET controller applies envelope pre-distortion to the RF signal. The ET controller initiates a function for shaping the supply voltage of the power amplifier by selecting a shaping table that can provide a specific level of increasing amplifier gain at higher signal drive level. The ET controller shapes the supply voltage for the power amplifier by adjusting values corresponding to the detected RF envelope. As a result, RF signals are propagated from the transceiver to the power amplifier output port across high and low transceiver drive levels with net constant gain. 1. A method for providing gain adjustment in a power amplifier , the method comprising:propagating a radio frequency (RF) signal;initiating an envelope tracking (ET) mechanism to detect an RF envelope of the RF signal propagating along a propagation path that includes the power amplifier;applying to the RF signal an envelope pre-distortion to (a) compensate for distortion that is expected at an output of the power amplifier and (b) provide a decreasing RF envelope gain at higher signal drive levels of a corresponding transceiver; andadjusting amplitude values of the detected RF envelope to shape a supply voltage of the power amplifier in order to provide at higher signal drive levels an increasing amplifier gain that is substantially compensated for by said decreasing RF envelope gain and enables the RF signal propagating along the propagation path to the output of the power amplifier to achieve a net constant gain.2. The method of claim 1 , wherein said adjusting further comprises:accessing a stored data structure having a number of shaping tables ...

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Номер записи: 77
13-05-2021 дата публикации

DIGITALLY CONTROLLED VARIABLE GAIN AMPLIFIER

Номер: US20210143784A1
Автор: Brebels Steven, Khalaf Khaled
Принадлежит:

A digitally controlled variable gain amplifier (VGA) for generating amplification output levels is disclosed. In one aspect, the digitally controlled VGA includes a positive amplification stage including at least two positive amplifiers, and a corresponding negative amplification stage coupled to the positive amplification stage. The negative amplification stage includes at least two negative amplifiers. The positive amplification stage and the corresponding negative amplification stage are digitally controlled by one or more digital codes. The corresponding negative amplification stage is coupled in parallel with the positive amplification stage and is equally weighted as the positive amplification stage, and both the positive amplification stage and the corresponding negative amplification stage selectively contribute to the generation of the amplification output levels for the digitally controlled VGA. 1. A digitally controlled variable gain amplifier (VGA) for generating amplification output levels , the digitally controlled VGA comprising:a positive amplification stage comprising at least two positive amplifiers; and the positive amplification stage and the corresponding negative amplification stage are digitally controlled by one or more digital codes,', 'the corresponding negative amplification stage is coupled in parallel to the positive amplification stage,', 'the corresponding negative amplification stage is equally weighted as the positive amplification stage, and', 'both the positive amplification stage and the corresponding negative amplification stage are configured to selectively contribute to the generation of the amplification output levels for the digitally controlled VGA., 'a corresponding negative amplification stage comprising at least two negative amplifiers, wherein2. The digitally controlled VGA of claim 1 , wherein the digital codes comprise a control bit claim 1 , and wherein the control bit is configured to control one or more of the at ...

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Номер записи: 78
10-05-2018 дата публикации

LINEAR HIGH VOLTAGE DRIVER WITH PROGRAMMABLE DIFFERENTIAL AND COMMON MODE GAIN

Номер: US20180131341A1
Автор: Nallamothu Pavan
Принадлежит: STMicroelectronics, Inc.

A low voltage to high voltage (LVHV) conversion circuit has an input configured to receive an input signal (at a relatively low voltage) and an output configured to generate an output signal (at a relatively high voltage). The LVHV conversion circuit includes a voltage to current conversion circuit referenced to the relatively low voltage and configured to convert a voltage of the input signal to a first current, wherein a magnitude of the first current is dependent on said voltage of the input signal and a gain setting value. A current mirroring circuit mirrors the first current and outputs a second current. A current to voltage conversion circuit converts the second current to a voltage of the output signal. The current mirroring circuit and current to voltage conversion circuit are referenced to the relatively high voltage. 1. A voltage driver circuit , comprising: a first voltage to current conversion circuit configured to convert a voltage of the first input signal to a first current, wherein a magnitude of the first current is dependent on said voltage of the first input signal and a gain setting value;', 'a first current mirroring circuit configured to mirror the first current and output a second current; and', 'a first current to voltage conversion circuit configured to convert the second current to a voltage of said first output signal', 'wherein said first current mirroring circuit and first current to voltage conversion circuit are referenced to a second supply voltage, said second supply voltage being greater than said first supply voltage., 'a first low voltage to high voltage (LV2HV) conversion circuit having a first input configured to receive a first input signal referenced to a first supply voltage and having a first output configured to generate a first output signal, wherein the first LV2HV conversion circuit comprises2. (canceled)3. The voltage driver circuit of claim 1 , wherein said first voltage to current conversion circuit comprises an ...

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Номер записи: 79
07-08-2014 дата публикации

METHOD OF REDUCING UN-CORRELATED NOISE IN AN AUDIO PROCESSING DEVICE

Номер: US20140219474A1
Автор: BENJAMINSEN Claus, CHRISTIANSEN Torben, FELDT Svend, Kaulberg Thomas
Принадлежит:

An audio processing device comprises a multitude of electric input signals, each electric input signal being provided in a digitized form, and a control unit receiving said digitized electric input signals and providing a resulting enhanced signal. The control unit is configured to determine the resulting enhanced signal from said digitized electric input signals, or signals derived therefrom, according to a predefined scheme. 1. An audio processing device comprisinga multitude of electric input signals, each electric input signal being provided in a digitized form, and further in a time-frequency representation comprising a number of frequency bands k and a number of time instances m,a control unit receiving said digitized electric input signals and providing a resulting enhanced signal, wherein the control unit is configured to determine the resulting enhanced signal from said digitized electric input signals, or signals derived therefrom, according to a predefined scheme, wherein the predefined scheme comprises that the content of a given time-frequency bin (k,m) of the enhanced signal is determined from the content of the time-frequency bin (k,m) of the electric input signal comprising the least energy.2. An audio processing device according to wherein one or more of said electric input signals X(k claim 1 ,m) (i=1 claim 1 , 2 claim 1 , . . . claim 1 , N) represents a signal from an input transducer claim 1 , such as a microphone or a wireless receiver.3. An audio processing device according to wherein one or more of said electric input signals X(k claim 1 ,m) (i=1 claim 1 , 2 claim 1 , . . . claim 1 , N) represents an omni-directional signal or a directional signal.4. An audio processing device according to wherein an electric input signal Xis an output from a processing algorithm in the sense that the electric input signal Xis the resulting signal after having been subject to a processing algorithm.5. An audio processing device according to comprising at least ...

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Номер записи: 80
23-04-2020 дата публикации

CHARGE-SCALING MULTIPLIER CIRCUIT WITH DIGITAL-TO-ANALOG CONVERTER

Номер: US20200127626A1
Автор: Erickson Karl, II John E., Paone Phil, Paulik George, Paulsen David, Sheets
Принадлежит:

A multiplier circuit can be fabricated within an integrated circuit and can draw a product output node to a voltage proportional to a product of first and second binary numbers received at two sets of inputs. The multiplier circuit includes a set of scaled capacitors, each capacitor of the set connected to an output of a multiplexor and to a local product output node. Each multiplexor is connected to the output of a multiplexor configured to generate an analog voltage in proportion to the value of the first binary number. Each scaled capacitor has a capacitance proportional to a significance of a respective bit of the second binary number. The multiplier circuit includes a reference capacitor connected to ground and the product output node, and a reset circuit configured to draw, in response to a RESET signal, the product output node to ground. 1. A multiplier circuit fabricated within an integrated circuit (IC) , the multiplier circuit configured to draw a product output node to a voltage proportional to a product of two received N-bit binary numbers , the multiplier circuit comprising:a first set of N inputs configured to receive a first N-bit binary number, each input of the first set of N inputs indexed by an integer bit number “n” corresponding to each input's respective significance, where n is in a range between and including 0 and N−1;a second set of N inputs configured to receive a second N-bit binary number, each input of the second set of N inputs indexed by the integer bit number “n” corresponding to each input's respective significance;a local reset device configured to draw, in response to receiving a reset signal, a local product node to ground;a unity gain amplifier configured to drive a product output node to a voltage equivalent to a voltage on the local product node; [{'sup': 'N', 'a voltage divider circuit configured to generate a set of 2analog voltages; and'}, [{'sup': N', 'N, 'receive, through 2analog inputs electrically connected to the ...

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Номер записи: 81
28-05-2015 дата публикации

SYSTEM AND METHOD FOR ENHANCING COMPREHENSIBILITY THROUGH SPATIALIZATION

Номер: US20150146889A1
Автор: Hetherington Phillip Alan, Paranjpe Shreyas
Принадлежит: QNX Software Systems Limited

A system and method for enhancing comprehensibility through spatialization may receive two or more audio signals each associated with one of two or more audio sources. A respective panning gain may be calculated for each of the two or more audio signals using a count of the total number of audio sources and a count of a total number of output channels. The respective panning gain may be calculated further responsive to audio source metadata associated with each of two or more audio sources. Each of the two or more audio signals may be gain adjusted responsive to the respective panning gain. Each of the two or more gain adjusted audio signals may be mixed to create two or more output channels wherein a reproduction of the output channels produces enhanced comprehensibility. 1. A method for enhancing comprehensibility through spatialization comprising:receiving two or more audio signals each associated with one of two or more audio sources;calculating a respective panning gain for each of the two or more audio signals using a count of the total number of audio sources and a count of a total number of output channels;gain adjusting each of the two or more audio signals responsive to the respective panning gain; andmixing each of the two or more gain adjusted audio signals to create two or more output channels wherein a reproduction of the output channels produces enhanced comprehensibility.2. The method for enhancing comprehensibility through spatialization of claim 1 , further comprising receiving audio source metadata associated with each of two or more audio sources.3. The method for enhancing comprehensibility through spatialization of claim 2 , calculating the respective panning gain further responsive to audio source metadata associated with each of two or more audio sources.4. The method for enhancing comprehensibility through spatialization of claim 2 , where the audio source metadata comprises any one or more of audio source location information claim 2 , ...

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Номер записи: 82
26-05-2016 дата публикации

TRANS-IMPEDANCE AMPLIFIER WITH REPLICA GAIN CONTROL

Номер: US20160149548A1
Автор: GORECKI James Lawrence, QUEK Irene
Принадлежит:

This disclosure relates to the field of amplifiers for multi-level optical communication and more particularly to techniques for trans-impedance amplifiers (TIA) with gain control. The claimed embodiments address the problem of implementing a low cost TIA that exhibits high linearity, low noise, low power, and wide bandwidth. More specifically, some claims are directed to approaches for providing TIA gain control using a plurality of inverter-based replica gain control cells controlled by a feedback loop to manage the current into the amplifying output stage and thereby the TIA output voltage. 1. A trans-impedance amplifier comprising:a first common node to receive a first current input;a first inverting amplifier having a first amplifier input coupled to the first common node, and having a first voltage output; anda first replica gain control module comprising a first module input coupled to the first common node, and at least one replica gain control cell having a cell terminal coupled to the first module input,wherein the first replica gain control module diverts a first replica gain control portion of the first current input away from the first inverting amplifier to effect the first voltage output.2. The trans-impedance amplifier of claim 1 , wherein at least one replica gain control cell further comprises at least one control input to control a magnitude of the first replica gain control portion.3. The trans-impedance amplifier of claim 2 , wherein at least one replica gain control cell further comprises at least one pass gate device coupled to the cell terminal and coupled to at least one control input.4. The trans-impedance amplifier of claim 2 , further comprising a gain control loop coupled to the first voltage output and at least one control input.5. The trans-impedance amplifier of claim 4 , wherein the gain control loop provides a discrete control signal coupled to at least one control input.6. The trans-impedance amplifier of claim 4 , wherein the gain ...

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Номер записи: 83
25-05-2017 дата публикации

Programmable gain amplifier with analog gain trim using interpolation

Номер: US20170149397A1
Автор: Aniruddha Roy, Nitin Agarwal
Принадлежит: Texas Instruments Inc

Disclosed examples include programmable gain amplifier (PGA) circuits with an operation amplifier circuit having a first amplifier input and a second amplifier input including a plurality of second input nodes, a resistor array including a plurality of resistor sections connected in series with one another between the amplifier output and a reference voltage node, and a trim select circuit coupled between the second amplifier input and the resistor array circuit to deliver a feedback voltage signal to each individual one of the second input nodes from a given selected one of a plurality of the tap points of the resistor array circuit according to a trim code to provide analog gain trimming by interpolation.

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Номер записи: 84
21-08-2014 дата публикации

ULTRASONIC SPEAKER SYSTEM

Номер: US20140233760A1
Автор: Konno Fumiyasu, KOTEGAWA Kazuhisa, Takeda Katsu
Принадлежит: Panasonic Corporation

An ultrasonic speaker system has a first variable gain block, a modulation block, a second variable gain block, an ultrasonic actuator, and a controller, wherein the controller controls gain of the first variable gain block so that a modulation degree of a modulated signal becomes a predetermined value, and when the controller raises the gain of the first variable gain block, the controller lowers the gain of the second variable gain block, while when the controller lowers the gain of the first variable gain block, the controller raises the gain of the second variable gain block. 1. An ultrasonic speaker system comprising:a first variable gain block for receiving a speech signal outputted from a speech signal source;a modulation block for receiving the speech signal outputted from the first variable gain block;a second variable gain block for receiving a modulated signal generated in the modulation block based on the speech signal;an ultrasonic actuator that is driven by the modulated signal outputted from the second variable gain block, coverts the modulated signal to an acoustic wave of a finite amplitude level, and radiates the acoustic wave into a medium; anda controller that controls the first variable gain block and the second variable gain block,wherein the controller controls gain of the first variable gain block so that a modulation degree of the modulated signal becomes a predetermined value,when the controller raises the gain of the first variable gain block, the controller lowers gain of the second variable gain block, andwhen the controller lowers the gain of the first variable gain block, the controller raises the gain of the second variable gain block.2. The ultrasonic speaker system according to claim 1 ,wherein the controller receives sound volume information from the speech signal source, and controls the gain of the first variable gain block and the gain of the second variable gain block according to the sound volume information.3. The ultrasonic ...

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Номер записи: 85
07-05-2020 дата публикации

SYSTEMS AND METHODS FOR TIA BASE CURRENT DETECTION AND COMPENSATION

Номер: US20200144971A1
Автор: Pinto Roger, Venkatesan Pravin Kumar
Принадлежит: Velodyne LiDAR, Inc.

Described herein are systems and methods that can adjust the performance of a transimpedance amplifier (TIA) in order to compensate for changing environmental and/or manufacturing conditions. In some embodiments, the changing environmental and/or manufacturing conditions may cause a reduction in beta of a bipolar junction transistor (BJT) in the TIA. A low beta may result in a high base current for the BJT causing the output voltage of the TIA to be formatted as an unusable signal output. To compensate for the low beta, the TIA generates an intermediate signal voltage, based on the base current and beta that is compared with the PN junction bias voltage on another BJT. Based on the comparison, the state of a digital state machine may be incremented, and a threshold base current is determined. This threshold base current may decide whether to compensate the operation of the TIA, or discard the chip. 1. A system comprising:a current digital to analog converter (DAC) operable to generate an idac current based on a first state level of a digital state machine;a transimpedance amplifier (TIA) operable to receive the idac current and to generate an intermediate signal voltage (VF) and generate an output voltage (Vout);a comparator operable to receive the intermediate signal voltage (VF) and a reference voltage and generate an output; andthe digital state machine operable to generate a second state level based on the output of the comparator,wherein, the current DAC changes its generated idac current if there is a difference between the first state level and the second state level.2. The system of claim 1 , wherein if the intermediate signal voltage (VF) is greater than the reference voltage claim 1 , the output of the comparator is a “1” claim 1 , causing the digital state machine to increment the first state level to a higher level state for the second state level claim 1 , in turn causing the current DAC to increase the idac current.3. The system of claim 2 , wherein if ...

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Номер записи: 86
16-06-2016 дата публикации

Dc offset calibration of wireless receivers

Номер: US20160173048A1
Автор: Khurram Waheed
Принадлежит: FREESCALE SEMICONDUCTOR INC

A receiver system includes an automatic gain control (AGC) module configured to control a first gain control signal to a first gain element having variable gain control. The receiver system also includes a DC (direct current) offset correction block coupled to the AGC module, the DC offset correction block configured to trigger the AGC module to output a set of calibration gain control signals to the first gain element and capture a set of DC offset measurements of a first signal received at the DC offset correction block, where the first signal is passed by the first gain element. The DC offset correction block is further configured to estimate one or more DC offset components using the set of DC offset measurements, and calculate a first correction control signal corresponding to a first gain level of the first gain element using the one or more DC offset components.

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Номер записи: 87
11-09-2014 дата публикации

Current Conveyor Circuit and Method

Номер: US20140253233A1
Автор: MCCAIN Terrie, Miller Matthew Richard
Принадлежит: Futurewei Technologies, Inc.

A system includes a first variable gain amplifier configured to receive an input signal and a first down-mixer coupled to the first variable gain amplifier. Also, the system includes a first current conveyor coupled to the first down mixer, where the first current conveyor includes a first cascode and a second cascode coupled to the first cascode. Additionally, the system includes a first channel filter coupled to the first current conveyor and a second variable gain amplifier coupled to the first channel filter.

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Номер записи: 88
29-09-2022 дата публикации

Systems and methods for linear variable gain amplifier

Номер: US20220311403A1
Автор: Karthik Raviprakash, Luke Wang, Praveen Prabha, Stephane Dallaire
Принадлежит: Marvell Asia Pte Ltd

The present invention is directed to electrical circuits. In a specific embodiment, the present invention provides variable gain amplifier that includes an impedance ladder and a control circuit. The impedance ladder includes n switches configured in parallel. The control circuit includes a digital-to-analog converter and an amplifier. The control circuit generates n control signals for the n switches. There are other embodiments as well.

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Номер записи: 89
18-09-2014 дата публикации

Methods and systems to provide low noise amplification

Номер: US20140266439A1
Автор: Keith Pinson, Nicholas P. Cowley, Viatcheslav I. Suetinov
Принадлежит: Intel Corp

An amplifier, including a voltage-to-current converter (V2I) to control an output current based on an input voltage, resistive degeneration circuitry to reduce baseband gain of the voltage-to-current converter, capacitive degeneration circuitry to increase passband gain of the voltage-to-current converter, and impedance control circuitry to compensate for negative input impedance of the capacitive degeneration circuitry. The V2I may include series-connected complimentary V2Is. The impedance control circuitry may include resistive negative feedback to provide a real part of input impedance, which may increase a frequency range for which the amplifier is linear. Capacitive degeneration and associated phase compensation may increase a frequency range for which the resistive feedback is negative. The amplifier may be configured as a single-input/single-output system and/or as a differential system.

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Номер записи: 90
02-07-2015 дата публикации

FACILITATING PURCHASES USING PERIPHERAL DEVICES

Номер: US20150186983A1
Автор: GANDHI Saumil Ashvin
Принадлежит:

A peripheral device, e.g., a headphone, connected to a communication device may have controls that are configured to switch between a regular mode and a purchase mode. When in the purchase mode, the controls of the peripheral device may be configured to facilitate purchase by receiving user input related to making a purchase. The peripheral or the communication device may be configured to receive user instructions, such as a voice command, to switch between the regular mode and the purchase mode. In particular, the controls may include volume buttons configured to adjust volume in the regular mode and configured to adjust purchase price in purchase mode. The controls also may include a start/end button configured to selectively activate or end an application in the regular mode and configured to confirm or select a purchase in the purchase mode. 1. A communication device comprising: receive, via a peripheral device connected to the communication device, a request to switch functions of peripheral controls of the peripheral device;', 'switch the functions of the peripheral controls of the peripheral device from a first mode for controlling audio settings to a second mode for receiving information;', 'receive information from the user via the peripheral controls of the peripheral device in the second mode that was switched from the first mode; and', 'process the information., 'one or more processors configured to2. The communication device of claim 1 , wherein the information received from the user comprises purchase information for making a purchase.3. The communication device of claim 1 , wherein the information received from the user comprises browsing information for navigating an electronic content.4. The communication device of claim 1 ,wherein the peripheral device is an audio output device configured to output an audio signal received from the communication device to the user; andwherein the peripheral controls of the peripheral device comprises a volume ...

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Номер записи: 91
28-05-2020 дата публикации

Sigma delta analog to digital converter

Номер: US20200169267A1
Автор: Xavier Albinet
Принадлежит: NXP BV

A Sigma-Delta analog to digital converter (ADC) is described. The Sigma-Delta ADC includes a series arrangement of a gain tracker, a first discrete-time integrator stage and a quantizer between an ADC input and an ADC output. The Sigma-Delta ADC includes a digital to analog converter (DAC) having a DAC input and a DAC output connected to the gain tracker. The Sigma-Delta analog to digital converter includes a controller having a control input connected to the quantizer output. The controller provides a digital input to the DAC input and provides a gain control signal to the gain tracker.

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Номер записи: 92
18-09-2014 дата публикации

APPARATUSES AND METHODS FOR ACOUSTIC CHANNEL AUTO-BALANCING DURING MULTI-CHANNEL SIGNAL EXTRACTION

Номер: US20140278384A1
Автор: Fan Dashen
Принадлежит: Kopin Corporation

Systems and methods are described to automatically balance acoustic channel sensitivity. A long-term power level of a main acoustic signal is calculated to obtain an averaged main acoustic signal. Segments of the main acoustic signal are excluded from the averaged main acoustic signal using a desired voice activity detection signal. A long-term power level of a reference acoustic signal is calculated to obtain an averaged reference acoustic signal. Segments of the reference acoustic signal are excluded from the averaged reference acoustic signal using a desired voice activity detection signal. An amplitude correction signal is created using the averaged main acoustic signal and the averaged reference acoustic signal. 1. A method to automatically balance acoustic channel sensitivity , comprising:calculating a long-term power level of a main acoustic signal to obtain an averaged main acoustic signal, wherein segments of the main acoustic signal are excluded from the averaged main acoustic signal using a desired voice activity detection signal;calculating a long-term power level of a reference acoustic signal to obtain an averaged reference acoustic signal, wherein segments of the reference acoustic signal are excluded from the averaged reference acoustic signal using the desired voice activity detection signal; andcreating an amplitude correction signal using the averaged main acoustic signal and the averaged reference acoustic signal.2. The method of claim 1 , wherein excluded segments of the main acoustic signal contain desired audio claim 1 , and excluded segments of the reference acoustic signal contain desired audio.3. The method of claim 1 , wherein the creating normalizes the averaged main acoustic signal by the averaged reference acoustic signal and the method further comprising:correcting the reference acoustic signal with the amplitude correction signal.4. The method of claim 3 , wherein the correcting multiplies the amplitude correction signal by the ...

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Номер записи: 93
16-07-2015 дата публикации

AUDIO OUTPUT CONTROL METHOD AND ELECTRONIC DEVICE SUPPORTING THE SAME

Номер: US20150200638A1
Автор: HONG Sang Phil, KO Han Ho, Lee Nam-II, PARK Je Heon
Принадлежит:

Disclosed is an audio output control method and an electronic device supporting the same. The audio output control method includes determining an output of an audio processing unit decoding an audio source signal, and controlling generating of a reference signal to be supplied to an audio output unit in response to an output of the audio processing unit. 1. An electronic device which controls an audio output , the electronic device comprising:an audio output unit;an audio processing unit for decoding audio data; anda controller configured to control the audio output unit to output a reference audio signal based on an output of the audio processing unit.2. The electronic device of claim 1 , wherein the controller is configured to control the audio output unit to output the reference audio signal by controlling to generate the reference audio signal or by controlling to provide the generated reference audio signal.3. The electronic device of claim 2 , wherein the audio output unit outputs the reference audio signal when the output of the audio processing unit includes value which is greater than or equal to a preset threshold.4. The electronic device of claim 2 , wherein the audio output unit outputs the reference audio signal when the audio processing unit outputs a signal of an audible frequency band.5. The electronic device of claim 2 , wherein the audio output unit does not output the reference audio signal when the output of the audio processing unit includes value which is less than a preset threshold.6. The electronic device of claim 1 , further comprising:a sensor module that detects at least one of a voltage signal and a current signal of the audio output unit;a temperature limiter that detects at least one of an impedance value and a temperature value, based on at least one of the detected voltage signal and the current signal;a gain control unit that performs a gain control on a decoded signal, based on at least one of the impedance value or the temperature ...

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Номер записи: 94
06-07-2017 дата публикации

Programmable impedance network in an amplifier

Номер: US20170194923A1
Автор: Rajendrakumar Joish
Принадлежит: Texas Instruments Inc

The disclosure provides an amplifier. The amplifier includes a first transistor that receives a first input. A second transistor receives a second input. A plurality of impedance networks is coupled between the first transistor and the second transistor. At least one impedance network of the plurality of impedance networks includes a first impedance path and a second impedance path. The first impedance path is activated during single ended operation, and the second impedance path is activated during differential operation.

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Номер записи: 95
23-07-2015 дата публикации

Adjusting Controls of an Audio Mixer

Номер: US20150207478A1
Автор: Duwenhorst Sven
Принадлежит:

Systems, methods, and computer program products relating to a user interface for mixing audio signals. In one embodiment, a method includes displaying in a user interface multiple source icons and a manipulator, each source icon representing a separate one of multiple audio sources, each audio source having an output level, receiving a first input modifying a position of the manipulator in the user interface, and determining gain control parameters of an audio mixer to adjust the output levels of each of the multiple audio sources according to the positions of the manipulator and the source icons relative to a reference center in response to the first input. Other embodiments include systems and computer program products. 1. A computer-implemented method comprising:displaying in a user interface multiple source icons and a manipulator, each source icon representing a separate one of multiple audio sources, each audio source having an output level, the manipulator and each source icon having a displayed position;receiving a first input modifying the position of the manipulator in the user interface;in response to receiving the first input, determining gain control parameters of an audio mixer to adjust the output levels of each of the multiple audio sources, the gain control parameters of the audio mixer determined according to a maximum gain factor and a perpendicular projection of the position of the manipulator onto each line of a plurality of lines, each line of the plurality of lines connecting a corresponding one of the positions of the source icons to a reference center;receiving an input grouping one or more audio sources into distinct groups; andassigning to each distinct group an independent manipulator element.2. The computer-implemented method of claim 1 , wherein adjusting the output level of an audio source comprises:setting a reference distance for each of the audio sources to a distance between the corresponding source icon and the reference center; ...

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Номер записи: 96
23-07-2015 дата публикации

DYNAMIC RANGE CONTROL WITH LARGE LOOK-AHEAD

Номер: US20150207479A1
Автор: Baumgarte Frank M.
Принадлежит:

A system and method applying Dynamic Range Control/Compression (DRC) to an audio signal. The dynamic range controller presented here differs from conventional DRC techniques by providing a much larger look-ahead time. In particular, the system and method takes advantage of the look-ahead by analyzing macroscopic loudness changes in the order of seconds as opposed to the microscopic changes most conventional DRCs are designed to control. This approach avoids most of the typical DRC distortions associated with conventional DRC techniques and preserves the micro-dynamics of the audio signal. Gain changes are applied at a rate comparable with manual volume adjustments by mixing and mastering engineers to balance a mix. Ideally, the DRC will approach what a professional sound engineer would do to reduce the dynamic range if there were only a volume control to accomplish the task on the final mix. 1. A method of performing dynamic range control (DRC) with a large look-ahead on an audio signal , comprising:generating a loudness estimate for the audio signal;generating adaptive time constants by analyzing the loudness estimate during a predefined look-ahead time period;smoothing the loudness estimate using the adaptive time constants;generating DRC gain values to apply to a delayed version of the audio signal based on the smoothed loudness estimate; andapplying the DRC gain values to the delayed audio signal.2. The method of claim 1 , wherein generating the adaptive time constants comprises:pre-smoothing the loudness estimate to smooth out transient peaks and dips in the loudness estimate.3. The method of claim 2 , wherein generating the adaptive time constants further comprises:{'sub': 'D', 'generating one or more decay slopes for the pre-smoothed loudness estimate based on a decay weight w; and'}{'sub': 'R', 'generating one or more rise slopes for the pre-smoothed loudness estimate based on a rise weight w, wherein the one or more decay slopes and the one or more rise ...

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Номер записи: 97
02-10-2014 дата публикации

Compensating for non-linear capacitance effects in a power amplifier

Номер: US20140295776A1
Автор: Bockelman David E., Srinivasan Vishnu
Принадлежит:

In one implementation, a power amplifier may include a gain device to receive an input signal and to output an amplified signal, and a compensation device coupled to the gain device to compensate for a change in a capacitance of the gain device occurring due to a change in the input signal. The power amplifier may be formed using a complementary metal oxide semiconductor (CMOS) process. 17.-. (canceled)8. A power amplifier comprising:a gain stage having first and second complementary amplifiers, the gain stage to receive a differential input signal on a differential input line and to output a differential amplified signal;a first compensation stage having a first compensation device coupled to a first amplifier of the first complementary amplifier and a second compensation device coupled to a first amplifier of the second complementary amplifier; anda second compensation stage having a first compensation device coupled to a second amplifier of the first complementary amplifier and a second compensation device coupled to a second amplifier of the second complementary amplifier, wherein each compensation device is to compensate for a change in capacitance of the corresponding amplifier when the differential input signal is in a predetermined transition region of an input range.9. The power amplifier of claim 8 , wherein the first compensation stage is formed in a well and is driven differentially.10. The power amplifier of claim 9 , further comprising a bias generator to provide a bias voltage to the first and second compensation devices of the first compensation stage claim 9 , and wherein a return current of the first compensation device is to travel through the second compensation device.11. The power amplifier of claim 8 , wherein each compensation device is of opposite polarity to the amplifier to which it is coupled.12. A method comprising:detecting an amplitude of an input signal into a gain stage;determining an amount of capacitance to be coupled to the gain ...

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Номер записи: 98
30-07-2015 дата публикации

Software for Manipulating Equalization Curves

Номер: US20150215703A1
Автор: Paumier Fabrice Gabriel
Принадлежит:

The disclosed embodiment may be a parametric equalization hardware that is coupled to computer readable memory software configured to present a command interface to a user and control the equalization hardware to manipulate the frequency, Q, and gain. Additionally, software is configured to simultaneously vary the Q and gain of an equalization curve between two preset values defined by: (1) a high gain and narrow Q (“Fire”); and (2) low gain and wide Q (“Water”). 1. An equalizer comprising:parametric equalization hardware that is coupled to computer readable memory with software in the form of programming code configured to present a command interface to a user and control the equalization hardware to manipulate the frequency, the Q, and the gain of an audio signal.2. The equalizer of wherein the software is further in the form of programming code that is configured with to display a character control slider that claim 1 , when manipulated claim 1 , simultaneously varies the Q and gain of an equalization curve between two preset values defined by: (1) a high gain and narrow Q; and (2) low gain and wide Q.3. An equalizer comprising:audio equipment hardware, including an equalizer hardware and computer hardware coupled to computer readable memory; andsoftware in the form of programming code installed on the computer readable memory for equalizing an audio signal.4. The equalizer of wherein the computer hardware and software are configured to visually present the frequency response curve of the audio equipment to the user.5. The equalizer of wherein the computer software may be operationally configured to alter the shape of the resonance response curve and correspondingly equalize the audio signal.6. The equalizer of wherein claim 5 , the frequency response is presented as a normal bell curve claim 5 , wherein the software is configured for adjusting the curve via manipulating the frequency for translating the curve claim 5 , Q for manipulating the horizontal scale of ...

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Номер записи: 99
26-07-2018 дата публикации

SPECTROMETER AND SPECTRUM MEASUREMENT METHOD THEREOF

Номер: US20180209845A1
Автор: Chen Cheng-Hsiung, Hsieh He-Yi, Huang Yung-Yu, LI HSI-PIN, Lin Ming-Hui
Принадлежит: InnoSpectra Corporation

A spectrometer and a spectrum measurement method thereof are provided. An analog-to-digital converter converts an amplified signal into a digital signal according to a reference voltage provided by a variable reference voltage generation circuit and amplifies the digital signal according to a target signal value, thereby approximating a signal value of the amplified digital signal to the target signal value. A control circuit outputs a spectral signal according to the amplified digital signal. A user can obtain spectrum measurement results that can be easily interpreted by the spectrometer and the spectrum measurement method thereof, without changing hardware or software, so as to improve convenience of use of the spectrometer. 1. A spectrometer , comprising:a first light sensor, sensing light to be measured from a testing object to generate a sensing signal;a variable gain amplifier, coupled to the first light sensor to amplify the sensing signal to generate an amplified signal;a variable reference voltage generation circuit, providing a reference voltage;an analog-to-digital converter, coupled to the variable gain amplifier and the variable reference voltage generation circuit, converting the amplified signal into a digital signal according to the reference voltage and amplifying the digital signal according to a target signal value, thereby approximating a signal value of the amplified digital signal to the target signal value; anda control circuit, coupled to the analog-to-digital converter and output a spectral signal according to the amplified digital signal.2. The spectrometer according to claim 1 , further comprising:a light source, coupled to the control circuit, controlled by the control circuit to generate irradiation light to irradiate the testing object to generate the light to be measured; anda second light sensor, coupled to the control circuit to sense a light intensity of the irradiation light to generate a light intensity sensing signal, wherein ...

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Номер записи: 100