МНОГОКАНАЛЬНЫЙ ФИЛЬТР НА ПОВЕРХНОСТНЫХ АКУСТИЧЕСКИХ ВОЛНАХ

Полезная модель относится к области радиоэлектроники и может быть использована в технике связи, в частности для предварительной селекции радиосигналов. Задачей полезной модели является повышение избирательности многоканального фильтра на ПАВ путем внесения в тракт выключенных (неработающих) каналов дополнительного затухания, что приводит к повышению внеполосного затухания для включенного канала. Поставленная задача достигается тем, что в многоканальный фильтр на ПАВ, имеющий входную и выходную клеммы, каждый канал которого содержит входной и выходной ключи, между которыми включено частотно-селективное устройство на ПАВ, причем вход входного ключа соединен со входом канала, а выход выходного ключа соединен с выходом канала, введены входной и выходной коммутаторы, содержащие ключи, причем вход и выход каждого канала (или группы каналов) соединены с первыми выводами ключей соответственно входного и выходного коммутаторов, вторые выводы которых соединены соответственно с входной и выходной ...

CIRCUIT AND METHOD FOR DYNAMICALLY MODIFIABLE SIGNAL PROCESSOR

SELECTABLE BAND-PASS FILTERING APPARATUS AND METHOD

A selectable band-pass filtering apparatus for use at the input of analysis instrumentation such as a spectrum analyzer for testing a multi-channel communication system, comprises a high-pass filter section including a plurality of separate high-pass filters each characterized by a respective high-pass cut- off frequency within a predetermined input frequency spectrum characterizing the communication system. The apparatus further comprises a low-pass filter section including a plurality of separate low-pass filters each characterized by a corresponding low-pass cut-off frequency within the input frequency spectrum. The apparatus further switching devices capable of connecting a selected high- pass filter in series with a selected low-pass filter, to select a passband having center frequency and bandwidth characteristics defined by corresponding high-pass cut-off frequency and said low-pass cut-off frequency. The selected passband characteristics correspond to one or more selected channels ...

LOW DELAY MODULATED FILTER BANK

The document relates to modulated sub-sampled digital filter banks, as well as to methods and systems for the design of such filter banks. In particular, the present document proposes a method and apparatus for the improvement of low delay modulated digital filter banks. The method employs modulation of an asymmetric low-pass prototype filter and a new method for optimizing the coefficients of this filter. Further, a specific design for a 64 channel filter bank using a prototype filter length of 640 coefficients and a system delay of 319 samples is given. The method substantially reduces artifacts due to aliasing emerging from independent modifications of subband signals, for example when using a filter bank as a spectral equalizer. The method is preferably implemented in software, running on a standard PC or a digital signal processor (DSP), but can also be hardcoded on a custom chip. The method offers improvements for various types of digital equalizers, adaptive filters, multiband companders ...

LOW DELAY MODULATED FILTER BANK

The document relates to modulated sub-sampled digital filter banks, as well as to methods and systems for the design of such filter banks. In particular, the present document proposes a method and apparatus for the improvement of low delay modulated digital filter banks. The method employs modulation of an asymmetric low-pass prototype filter and a new method for optimizing the coefficients of this filter. Further, a specific design for a 64 channel filter bank using a prototype filter length of 640 coefficients and a system delay of 319 samples is given. The method substantially reduces artifacts due to aliasing emerging from independent modifications of subband signals, for example when using a filter bank as a spectral equalizer. The method is preferably implemented in software, running on a standard PC or a digital signal processor (DSP), but can also be hardcoded on a custom chip. The method offers improvements for various types of digital equalizers, adaptive filters, multiband companders ...

COMPLEX EXPONENTIAL MODULATED FILTER BANK FOR HIGH FREQUENCY RECONSTRUCTION OR PARAMETRIC STEREO

The document relates to modulated sub-sampled digital filter banks, as well as to methods and systems for the design of such filter banks. In particular, the present document proposes a method and apparatus for the improvement of low delay modulated digital filter banks. The method employs modulation of an asymmetric low-pass prototype filter and a new method for optimizing the coefficients of this filter. Further, a specific design for a 64 channel filter bank using a prototype filter length of 640 coefficients and a system delay of 319 samples is given. The method substantially reduces artifacts due to aliasing emerging from independent modifications of subband signals, for example when using a filter bank as a spectral equalizer. The method is preferably implemented in software, running on a standard PC or a digital signal processor (DSP), but can also be hardcoded on a custom chip. The method offers improvements for various types of digital equalizers, adaptive filters, multiband companders and spectral envelope adjusting filter banks used in high frequency reconstruction (HFR) or parametric stereo systems.

LOW DELAY MODULATED FILTER BANK

The document relates to modulated sub-sampled digital filter banks, as well as to methods and systems for the design of such filter banks. In particular, the present document proposes a method and apparatus for the improvement of low delay modulated digital filter banks. The method employs modulation of an asymmetric low-pass prototype filter and a new method for optimizing the coefficients of this filter. Further, a specific design for a (64) channel filter bank using a prototype filter length of (640) coefficients and a system delay of (319) samples is given. The method substantially reduces artifacts due to aliasing emerging from independent modifications of subband signals, for example when using a filter bank as a spectral equalizer. The method is preferably implemented in software, running on a standard PC or a digital signal processor (DSP), but can also be hardcoded on a custom chip. The method offers improvements for various types of digital equalizers, adaptive filters, multiband ...

aparelho de processamento de sinal para filtrar e processar um sinal de áudio e método realizado por um aparelho de processamento de sinal para filtrar e processar um sinal de áudio

Low delay modulated filter bank and method for the design of the low delay modulated filter bank

ATTENUATION ELEMENT

The invention relates to an attenuation element. According to the invention, this attenuation element has two rail pieces (46, 48) and two conducting pieces (50, 52), wherein a rail piece (46, 48) and a conducting piece (50, 52) each are electrically connected in parallel, wherein these rail pieces (46, 48) are spatially disposed in parallel at a distance from each other, and wherein the conducting pieces (50, 52) each are made of electrically highly conductive material, and the rail pieces (46, 48) each are made of an electrically poorly conductive material. In this manner, the high-frequency currents can be substantially attenuated in a rectifier having distributed intermediate voltage circuits without the power loss in the intermediate voltage circuit markedly increasing such that the capacitors (10, 12, 24, 28) of the rectifier having distributed intermediate voltage circuits no longer need to be oversized with regard to an RMS current of the intermediate voltage circuit of this rectifier.

Hearing apparatus having an adaptive filter and method for filtering an audio signal

A hearing apparatus that processes an audio signal by adaptive filtering operates efficiently. The hearing apparatus has a first stage transformation unit and at least two second stage transformation units. Each of the second stage transformation units splits the signal of one of the first stage channels through transformation onto sub-channels of the channel. A filter unit in each channel that has a second stage transformation unit filters the signal of the channel depending on weighting factors that are determined in each case for the sub-channels. The filter units are configured to exchange weighting factors among themselves, which means that only some of the weighting factors actually need to be calculated.

Complex exponential modulated filter bank for high frequency reconstruction

An apparatus and method are disclosed for filtering and performing high frequency reconstruction of an audio signal. The apparatus includes an analysis filter bank, a phase shifter, a high frequency reconstructor, and a synthesis filter bank. The analysis filterbank receives real-valued time domain input audio samples and generates complex valued subband samples. The phase shifter shifts a phase of the complex-valued subband samples by an arbitrary amount. The high frequency reconstructor modifies at least some of the complex valued subband samples. A phase shifter unshifts a phase of the modified complex-valued subband samples by the arbitrary amount. The synthesis filter bank receives the modified complex valued subband samples and generates time domain output audio samples. The analysis filter bank comprises analysis filters that are complex exponential modulated versions of a prototype filter with an arbitrary phase shift.

Method, system, and apparatus for resonator circuits and modulating resonators

Embodiments of resonator circuits and modulating resonators and are described generally herein. One or more acoustic wave resonators may be coupled in series or parallel to generate tunable filters. One or more acoustic wave resonances may be modulated by one or more capacitors or tunable capacitors. One or more acoustic wave modules may also be switchable in a filter. Other embodiments may be described and claimed.

Crystal filter array

... 1,082,040. Electro-mechanical filters. HUGHES AIRCRAFT CO. Aug. 3, 1966 [Sept. 3, 1965], No. 34745/66. Heading H3U. A comb filter comprises crystal filters 1, 2, 3, . . . n each providing heavy attenuation for signals at all frequencies except for those falling within the sharply defined narrow passband of the particular crystal filter, the respective passbands of the various crystal filters being contiguous so as to cover overall a wide frequency range. The comb filter is driven from a signal source 60 of variable frequency and is connected to the input leads 62, 70 of the crystal filters, transformer windings 66, 68 being connected between the leads. The crystal filters are similar to each other except that they have slightly different resonant frequencies. Considering, for example, crystal filter 1, this comprises a first quartz crystal 13 connected between the input lead 62 and a terminal 14 and a second quartz crystal 15 connected between the input lead 70 and the terminal 14. A load ...

COMPLEX EXPONENTIAL MODULATED FILTER BANK FOR HIGH FREQUENCY RECONSTRUCTION

COMPLEX EXPONENTIAL MODULATED FILTER BANK FOR HIGH FREQUENCY RECONSTRUCTION OR PARAMETRIC STEREO

Signal processing devices and methods filter and process an audio signal. A signal processing device includes a high frequency reconstructor or a parametric stereo processor that generates modified complex-valued subband sample; and a synthesis filter bank that receives the modified complex-valued subband samples and generates time domain output audio samples. The analysis filter bank comprises analysis filters (h k(n)) and the synthesis filter bank comprises synthesis filters (f k(n)) that are complex exponential modulated versions of a prototype filter (p0(n)) that has a length N. The analysis filter bank and synthesis filter bank have a system delay of D samples, wherein D is smaller than N. This structure can provide a reduced overall delay.

LOW DELAY MODULATED FILTER BANK

The document relates to modulated sub-sampled digital filter banks, as well as to methods and systems for the design of such filter banks. In particular, the present document proposes a method and apparatus for the improvement of low delay modulated digital filter banks. The method employs modulation of an asymmetric low-pass prototype filter and a new method for optimizing the coefficients of this filter. Further, a specific design for a (64) channel filter bank using a prototype filter length of (640) coefficients and a system delay of (319) samples is given. The method substantially reduces artifacts due to aliasing emerging from independent modifications of subband signals, for example when using a filter bank as a spectral equalizer. The method is preferably implemented in software, running on a standard PC or a digital signal processor (DSP), but can also be hardcoded on a custom chip. The method offers improvements for various types of digital equalizers, adaptive filters, multiband ...

CRYSTAL FILTER ARRAY

Complex exponential modulated filter bank for high frequency reconstruction or parametric stereo

An apparatus and method are disclosed for filtering and performing high frequency reconstruction of an audio signal. The apparatus includes an analysis filter bank, a phase shifter, a high frequency reconstructor, and a synthesis filter bank. The analysis filterbank receives real-valued time domain input audio samples and generates complex valued subband samples. The phase shifter shifts a phase of the complex-valued subband samples by an arbitrary amount. The high frequency reconstructor modifies at least some of the complex valued subband samples. A phase shifter unshifts a phase of the modified complex-valued subband samples by the arbitrary amount. The synthesis filter bank receives the modified complex valued subband samples and generates time domain output audio samples. The analysis filter bank comprises analysis filters that are complex exponential modulated versions of a prototype filter with an arbitrary phase shift.

METHOD, SYSTEM, AND APPARATUS FOR WIDEBAND SIGNAL PROCESSEING

БЛОК МОДУЛИРОВАННЫХ ФИЛЬТРОВ С МАЛЫМ ЗАПАЗДЫВАНИЕМ

... 1. Способ (300) определения N коэффициентов асимметричного фильтра-прототипа рдля его использования для построения М-канального блока (101, 102) прореженных анализирующих/синтезирующих фильтров с малым запаздыванием, включающего М анализирующих фильтров h(103) и М синтезирующих фильтров f(106), k=0, …, M-1, где М больше 1, и содержащего передаточную функцию, причем способ включает следующие этапы на которых:- выбирают (301) целевую передаточную функцию блока фильтров, включающую целевое запаздывание D, где D меньше или равно N;- определяют (303, 304, 305) сложную целевую функцию е, включающую член еошибки полосы пропускания и член еошибки эффекта наложения спектров; где член еошибки полосы пропускания связан с отклонением между передаточной функцией блока фильтров и целевой передаточной функцией; и где член еошибки эффекта наложения спектров связан с ошибками, возникающими вследствие субдискретизации блока фильтров; при этом член еошибки полосы пропускания определяют (303) путем накопления ...

ПОЛОСОВОЙ ПЬЕЗОЭЛЕКТРИЧЕСКИЙ ФИЛЬТР

Изобретение относится к радиоэлектронике и может быть использовано в качестве фильтра основной селекции профессиональных радиоприемных устройств. Фильтр содержит N пар пьезорезонаторов (ПР), первый и второй трансформаторы (Т) (2, 3), из которых первый Т (2) имеет одну обмотку с (N+1) выводами, второй Т (3) имеет две обмотки, причем первая обмотка второго Т (3) имеет (2N+1) выводов, а вторая обмотка имеет два вывода. Первые выводы каждой i-пары ПР объединены и подключены соответственно к i-му (i=1,2,...N) отводу обмотки первого Т (2). Вторые выводы каждой i-й пары ПР подключены к отводам первой обмотки второго Т (3). При этом второй вывод первого ПР i-й пары подключен к i-му отводу, а второй вывод второго ПР i-й пары подключен к (2N+2-i)-му отводу соответственно. (N+1)-й вывод первого Т (2) соединен с входной потенциальной клеммой фильтра, (N+1)-й отвод первой обмотки второго Т (3) соединен с общей шиной, выводы второй обмотки второго Т (3) подключены к выходным клеммам фильтра. Технический результат - уменьшение уровня интермодуляционных искажений третьего порядка. 1 ил. 9196г с ПЧ ГЭ РОССИЙСКОЕ АГЕНТСТВО ПО ПАТЕНТАМ И ТОВАРНЫМ ЗНАКАМ (19) ВИ “” 2 195 765 ^^ С1 (51) МПК? Н 03 н 7/12, 9/54 12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ РОССИЙСКОЙ ФЕДЕРАЦИИ (21), (22) Заявка: 2001114905/09, 30.05.2001 (24) Дата начала действия патента: 30.05.2001 (46) Дата публикации: 27.12.2002 (56) Ссылки: БОСЫЙ Н.Д. Электрические фильтры. - Киев: Государственное издательство технической литературы УССР, 1960, с.348, рис.7, 336. КО 1579418 С, 15.12.1994. СВ 2208459 А, 30.03.1989. ВЕЛИКИН Я.И. и др. Пьезоэлектрические фильтры. - М.: Связь, 1966, с.210, рис. 4.1а. (98) Адрес для переписки: 644009, г.Омск-9, ул. Масленникова, 231, ОНИИП ГУП (71) Заявитель: Государственное унитарное предприятие Омский научно-исследовательский институт приборостроения (72) Изобретатель: Насонова Л.В., Яковлев А.Н., Ясинский И.М. (73) Патентообладатель: Государственное унитарное предприятие Омский научно- ...

Filter device esp. for two band radio system

The filter device has a housing (30) and at least two filter elements (21,22) provided in the housing. Each of the filter elements (21,22) only passes signals within a predetermined frequency band. The predetermined frequency bands of the filters have average frequencies different from each other. The device has an input terminal (T1) which is connected to the respective inputs of the at least two filter elements (21,22) and is used by both or all of these in common. The device also has an output terminal (T3) which is connected to the respective outputs of the at least two filter elements (21,22) and is used by both or all of these in common. The device may also have a first phase adaptor unit (31) between the input terminal (T1) and the filter inputs. It may also have a second phase adaptor unit (32) between the output terminal (T3) and the filter outputs.

Elektrisch/akustischer und akustisch/elektrischer Wandler für Oberflächenwellenanordnung mit niedriger Diffraktion und entsprechende Oberflächenwellenanordnung.

Multiple response filtering apparatus

COMPLEX EXPONENTIAL MODULATED FILTER BANK FOR HIGH FREQUENCY RECONSTRUCTION OR PARAMETRIC STEREO

... ²The document relates to modulated sub-sampled digital filter banks, as well as ²to methods ²and systems for the design of such filter banks. In particular, the present ²document proposes ²a method and apparatus for the improvement of low delay modulated digital ²filter banks. ²The method employs modulation of an asymmetric low-pass prototype filter and a ²new ²method for optimizing the coefficients of this filter. Further, a specific ²design for a 64 ²channel filter bank using a prototype filter length of 640 coefficients and a ²system delay of ²319 samples is given. The method substantially reduces artifacts due to ²aliasing emerging ²from independent modifications of subband signals, for example when using a ²filter bank as ²a spectral equalizer. The method is preferably implemented in software, ²running on a ²standard PC or a digital signal processor (DSP), but can also be hardcoded on ²a custom ²chip. The method offers improvements for various types of digital equalizers, ²adaptive ...

ACOUSTIC/ELECTRIC TRANSDUCERS AND ACOUSTIC/ELECTRIC SAW DEVICE REDUCED AND DIFFRACTIVE SURFACE WAVE DEVICE CORRESPONDING

고 주파수 재구성을 위한 복소 지수 변조 필터 뱅크

... 본 문서는 변조되고 서브-샘플링된 디지털 필터 뱅크들뿐만 아니라, 그와 같은 필터 뱅크들의 설계를 위한 방법들 및 시스템들에 관한 것이다. 특히, 본 문서는 저 지연 변조 디지털 필터 뱅크들의 개선을 위한 방법 및 장치를 제안한다. 상기 방법은 비대칭 저역 통과 프로토타입 필터의 변조 및 이 필터의 계수들을 최적화하기 위한 새로운 방법을 이용한다. 더욱이, 계수들(640)의 프로토타입 필터 길이 및 샘플들(319)의 시스템 지연을 이용하는 채널 필터 뱅크(64)에 대한 특정 설계가 제공된다. 상기 방법은 예를 들어 필터 뱅크를 스펙트럼 이퀄라이저로 이용할 때, 서브대역 신호들의 독자적인 변경들로부터 발생하는 에일리어싱으로 인한 아티팩트들을 실질적으로 감소시킨다. 상기 방법은 바람직하게도 표준 PC 또는 디지털 신호 프로세서(DSP)에서 운영되는 소프트웨어에서 구현되지만, 또한 주문형 칩에서 하드코딩될 수 있다. 상기 방법은 다양한 유형들의 디지털 이퀄라이저들, 적응형 필터들, 다중대역 압신기들 및 고주파 복원(HFR) 또는 파라메트릭 스테레오 시스템들에서 이용되는 필터 뱅크들을 조정하는 스펙트럼 포락선에 대한 개선들을 제공한다.

고 주파수 재구성 또는 파라메트릭 스테레오를 위한 복소 지수 변조 필터 뱅크

... 본 문서는 변조되고 서브-샘플링된 디지털 필터 뱅크들뿐만 아니라, 그와 같은 필터 뱅크들의 설계를 위한 방법들 및 시스템들에 관한 것이다. 특히, 본 문서는 저 지연 변조 디지털 필터 뱅크들의 개선을 위한 방법 및 장치를 제안한다. 상기 방법은 비대칭 저역 통과 프로토타입 필터의 변조 및 이 필터의 계수들을 최적화하기 위한 새로운 방법을 이용한다. 더욱이, 계수들(640)의 프로토타입 필터 길이 및 샘플들(319)의 시스템 지연을 이용하는 채널 필터 뱅크(64)에 대한 특정 설계가 제공된다. 상기 방법은 예를 들어 필터 뱅크를 스펙트럼 이퀄라이저로 이용할 때, 서브대역 신호들의 독자적인 변경들로부터 발생하는 에일리어싱으로 인한 아티팩트들을 실질적으로 감소시킨다. 상기 방법은 바람직하게도 표준 PC 또는 디지털 신호 프로세서(DSP)에서 운영되는 소프트웨어에서 구현되지만, 또한 주문형 칩에서 하드코딩될 수 있다. 상기 방법은 다양한 유형들의 디지털 이퀄라이저들, 적응형 필터들, 다중대역 압신기들 및 고주파 복원(HFR) 또는 파라메트릭 스테레오 시스템들에서 이용되는 필터 뱅크들을 조정하는 스펙트럼 포락선에 대한 개선들을 제공한다.

SIGNAL HANDLING APPARATUS FOR IMPROVING LINEARITY OF RADIO FREQUENCY CIRCUITS

A signal handler providing high linearity in a small size, applicable across wide operating frequencies and bandwidths, while also adapted to preferred integrated circuit (IC) and printed circuit board technologies. In one implementation, a signal handling apparatus (100) includes an input impedance transformer (102) for receiving an input signal and matching an internal apparatus impedance, a splitter (104) for providing N split signals, a number of signal processing circuits (110; 112-1,..., 112-m) for processing the N split signals, a combiner (120) for combining the N split signals into a combined signal, and output impedance transformer (122) for receiving the combined signal and for matching the internal apparatus impedance to an output impedance of the apparatus. The apparatus may provide filtering, duplexing and other radio frequency signal processing functions. A tunable duplexer may be implemented using a vector inductor and tunable capacitor array with frequency dependent impedance ...

High linearity variable capacitor array

A highly linear, variable capacitor array constructed from multiple cells. Each cell includes a pair of passive, capacitor components connected in anti-parallel. The capacitor components may be Metal Oxide Semiconductor (MOS) capacitors. A control circuit applies bias voltages to bias voltage terminals associated with each capacitor component, to thereby control the overall capacitance of the array.

COMPLEX EXPONENTIAL MODULATED FILTER BANK FOR HIGH FREQUENCY RECONSTRUCTION OR PARAMETRIC STEREO

COMPLEX EXPONENTIAL MODULATED FILTER BANK FOR HIGH FREQUENCY RECONSTRUCTION OR PARAMETRIC STEREO

A signal processing device for filtering and processing an audio signal, the signal processing device comprising: an analysis filter bank that receives real valued time domain input audio samples and generates complex valued subband samples; a high frequency reconstructor or parametric stereo processor that generates modified complex valued subband samples; and a synthesis filter bank that receives the modified complex valued subband samples and generates time domain output audio samples, wherein the analysis filter bank comprises analysis filters (h k(n)) that are complex exponential modulated versions of a prototype filter (p0(n)) according to: (see above formula) 0<=n < N, 0 <=k < M where A is a phase shift, the analysis filter bank has M channels, the prototype filter (p0(n)) has a length N, and the analysis filter bank and synthesis filter bank have a system delay of D samples, wherein the analysis filterbank includes a plurality of decimators that down sample the complex valued subband ...

COMPLEX EXPONENTIAL MODULATED FILTER BANK FOR HIGH FREQUENCY RECONSTRUCTION OR PARAMETRIC STEREO

The document relates to modulated sub-sampled digital filter banks, as well as to methods and systems for the design of such filter banks. In particular, the present document proposes a method and apparatus for the improvement of low delay modulated digital filter banks. The method employs modulation of an asymmetric low-pass prototype filter and a new method for optimizing the coefficients of this filter. Further, a specific design for a 64 channel filter bank using a prototype filter length of 640 coefficients and a system delay of 319 samples is given. The method substantially reduces artifacts due to aliasing emerging from independent modifications of subband signals, for example when using a filter bank as a spectral equalizer. The method is preferably implemented in software, running on a standard PC or a digital signal processor (DSP), but can also be hardcoded on a custom chip. The method offers improvements for various types of digital equalizers, adaptive filters, multiband companders and spectral envelope adjusting filter banks used in high frequency reconstruction (HFR) or parametric stereo systems.

LOW DELAY MODULATED FILTER BANK

The document relates to modulated sub-sampled digital filter banks, as well as to methods and systems for the design of such filter banks. In particular, the present document proposes a method and apparatus for the improvement of low delay modulated digital filter banks. The method employs modulation of an asymmetric low-pass prototype filter and a new method for optimizing the coefficients of this filter. Further, a specific design for a 64 channel filter bank using a prototype filter length of 640 coefficients and a system delay of 319 samples is given. The method substantially reduces artifacts due to aliasing emerging from independent modifications of subband signals, for example when using a filter bank as a spectral equalizer. The method is preferably implemented in software, running on a standard PC or a digital signal processor (DSP), but can also be hardcoded on a custom chip. The method offers improvements for various types of digital equalizers, adaptive filters, multiband companders and spectral envelope adjusting filter banks used in high frequency reconstruction (HFR) or parametric stereo systems.

Vector inductor having multiple mutually coupled metalization layers providing high quality factor

저 지연 변조 필터 뱅크

본 문서는 변조되고 서브-샘플링된 디지털 필터 뱅크들뿐만 아니라, 그와 같은 필터 뱅크들의 설계를 위한 방법들 및 시스템들에 관한 것이다. 특히, 본 문서는 저 지연 변조 디지털 필터 뱅크들의 개선을 위한 방법 및 장치를 제안한다. 상기 방법은 비대칭 저역 통과 프로토타입 필터의 변조 및 이 필터의 계수들을 최적화하기 위한 새로운 방법을 이용한다. 더욱이, 계수들(640)의 프로토타입 필터 길이 및 샘플들(319)의 시스템 지연을 이용하는 채널 필터 뱅크(64)에 대한 특정 설계가 제공된다. 상기 방법은 예를 들어 필터 뱅크를 스펙트럼 이퀄라이저로 이용할 때, 서브대역 신호들의 독자적인 변경들로부터 발생하는 에일리어싱으로 인한 아티팩트들을 실질적으로 감소시킨다. 상기 방법은 바람직하게도 표준 PC 또는 디지털 신호 프로세서(DSP)에서 운영되는 소프트웨어에서 구현되지만, 또한 주문형 칩에서 하드코딩될 수 있다. 상기 방법은 다양한 유형들의 디지털 이퀄라이저들, 적응형 필터들, 다중대역 압신기들 및 고주파 복원(HFR) 또는 파라메트릭 스테레오 시스템들에서 이용되는 필터 뱅크들을 조정하는 스펙트럼 포락선에 대한 개선들을 제공한다. This document relates to modulated and sub-sampled digital filter banks as well as methods and systems for designing such filter banks. In particular, this document proposes a method and apparatus for improvement of low delay modulation digital filter banks. The method uses a new method for modulating the asymmetric low-pass prototype filter and for optimizing the coefficients of this filter. Moreover, a specific design for the channel filter bank 64 utilizing the prototype filter length of the coefficients 640 and the system delay of the samples 319 is provided. The method substantially reduces artifacts due to aliasing resulting from unique modifications of subband signals, for example when using a filter bank as a spectrum equalizer. The method is preferably implemented in software running on a standard PC or a digital signal processor (DSP), but may also be hard coded on a custom chip. The method provides improvements for various types of digital equalizers, adaptive filters, multiband compressors, and spectral envelopes that adjust filter banks used in high frequency reconstruction (HFR) or parametric stereo systems.

저 지연 변조 필터 뱅크

... 본 문서는 변조되고 서브-샘플링된 디지털 필터 뱅크들뿐만 아니라, 그와 같은 필터 뱅크들의 설계를 위한 방법들 및 시스템들에 관한 것이다. 특히, 본 문서는 저 지연 변조 디지털 필터 뱅크들의 개선을 위한 방법 및 장치를 제안한다. 상기 방법은 비대칭 저역 통과 프로토타입 필터의 변조 및 이 필터의 계수들을 최적화하기 위한 새로운 방법을 이용한다. 더욱이, 계수들(640)의 프로토타입 필터 길이 및 샘플들(319)의 시스템 지연을 이용하는 채널 필터 뱅크(64)에 대한 특정 설계가 제공된다. 상기 방법은 예를 들어 필터 뱅크를 스펙트럼 이퀄라이저로 이용할 때, 서브대역 신호들의 독자적인 변경들로부터 발생하는 에일리어싱으로 인한 아티팩트들을 실질적으로 감소시킨다. 상기 방법은 바람직하게도 표준 PC 또는 디지털 신호 프로세서(DSP)에서 운영되는 소프트웨어에서 구현되지만, 또한 주문형 칩에서 하드코딩될 수 있다. 상기 방법은 다양한 유형들의 디지털 이퀄라이저들, 적응형 필터들, 다중대역 압신기들 및 고주파 복원(HFR) 또는 파라메트릭 스테레오 시스템들에서 이용되는 필터 뱅크들을 조정하는 스펙트럼 포락선에 대한 개선들을 제공한다.

고 주파수 재구성 또는 파라메트릭 스테레오를 위한 복소 지수 변조 필터 뱅크

... 본 문서는 변조되고 서브-샘플링된 디지털 필터 뱅크들뿐만 아니라, 그와 같은 필터 뱅크들의 설계를 위한 방법들 및 시스템들에 관한 것이다. 특히, 본 문서는 저 지연 변조 디지털 필터 뱅크들의 개선을 위한 방법 및 장치를 제안한다. 상기 방법은 비대칭 저역 통과 프로토타입 필터의 변조 및 이 필터의 계수들을 최적화하기 위한 새로운 방법을 이용한다. 더욱이, 계수들(640)의 프로토타입 필터 길이 및 샘플들(319)의 시스템 지연을 이용하는 채널 필터 뱅크(64)에 대한 특정 설계가 제공된다. 상기 방법은 예를 들어 필터 뱅크를 스펙트럼 이퀄라이저로 이용할 때, 서브대역 신호들의 독자적인 변경들로부터 발생하는 에일리어싱으로 인한 아티팩트들을 실질적으로 감소시킨다. 상기 방법은 바람직하게도 표준 PC 또는 디지털 신호 프로세서(DSP)에서 운영되는 소프트웨어에서 구현되지만, 또한 주문형 칩에서 하드코딩될 수 있다. 상기 방법은 다양한 유형들의 디지털 이퀄라이저들, 적응형 필터들, 다중대역 압신기들 및 고주파 복원(HFR) 또는 파라메트릭 스테레오 시스템들에서 이용되는 필터 뱅크들을 조정하는 스펙트럼 포락선에 대한 개선들을 제공한다.

Method, system, and apparatus for resonator circuits and modulating resonators

Embodiments of resonator circuits and modulating resonators and are described generally herein. One or more acoustic wave resonators may be coupled in series or parallel to generate tunable filters. One or more acoustic wave resonances may be modulated by one or more capacitors or tunable capacitors. One or more acoustic wave modules may also be switchable in a filter. Other embodiments may be described and claimed.

Differential filter topology with dielectric absorption cancellation for a data acquisition device

In one embodiment, a differential filter is configured using a differential operational amplifier (op-amp) with two feedback RC networks, each RC network coupled between a respective input and a respective output of the op-amp. Two capacitive elements may each provide mid-band positive feedback from a respective output of the op-amp to the midpoint of a respective corresponding resistive element, where each resistive element is coupled to a respective input of the op-amp. The mid-band positive feedback may operate to convert a first-order response of the filter to a second-order response. In one set of embodiments, dielectric absorption (DA) cancellation may be implemented with positive RC feedback from a divided version of a respective one of the op-amp outputs. For cascaded filters, DA cancellation may be implemented with positive RC feed-forward. Transistors coupled across the feedback RC networks may be used to disable the filter, decoupling the filter from other circuit components ...

Surface acoustic wave device

A surface acoustic wave device includes a semiconductor substrate, a piezoelectric film disposed on the semiconductor substrate, at least one pair of comb-shaped electrodes constituting an input transducer and an output transducer, a plurality of surface acoustic wave filters having different bands which include a plurality of metal electrodes, so disposed that each of them is located between the input and output comb-shaped electrodes of each of the surface, acoustic wave filters, a bias voltage applying arrangement for applying bias voltages to each of the metal electrodes; and a bias voltage regulating arrangement for regulating the bias voltages.

Complex Exponential Modulated Filter Bank for High Frequency Reconstruction

An apparatus and method are disclosed for filtering and performing high frequency reconstruction of an audio signal. The apparatus includes an analysis filter bank, a high frequency reconstructor, and a synthesis filter bank. The analysis filterbank receives real-valued time domain input audio samples and generates complex valued subband samples. The high frequency reconstructor modifies at least some of the complex valued subband samples. The synthesis filter bank receives the modified complex valued subband samples and generates time domain output audio samples. The analysis filter bank comprises analysis filters that are complex exponential modulated versions of a prototype filter with an arbitrary phase shift.

Hearing device with adaptive filter and method of filtering an audio signal

Eine Aufgabe der vorliegenden Erfindung besteht darin, bei einer Hörvorrichtung, die ein Audiosignal mittels eines adaptiven Filters verarbeitet, einen effizienten Betrieb zu ermöglichen. Die erfindungsgemäße Hörvorrichtung (10) umfasst eine Transformationseinrichtung (14) erster Stufe und zumindest zwei Transformationseinrichtungen (16) zweiter Stufe, wobei jede Transformationseinrichtung (16) zweiter Stufe dazu ausgelegt ist, das Signal eines der Kanäle erster Stufe durch Transformieren auf Subkanäle des Kanals aufzuteilen. Eine Filtereinrichtung (18) in jedem Kanal, der eine Transformationseinrichtung (16) zweiter Stufe aufweist, filtert das Signal des Kanals in Abhängigkeit von zu den Subkanälen jeweils ermittelten Gewichtungsfaktoren. Die Filtereinrichtung (18) sind dabei dazu ausgelegt, untereinander Gewichtungsfaktoren auszutauschen, so dass nur einige der Gewichtungsfaktoren tatsächlich berechnet werden müssen.

COMPLEX EXPONENTIAL MODULATED FILTER BANK FOR HIGH FREQUENCY RECONSTRUCTION OR PARAMETRIC STEREO

The document relates to modulated sub-sampled digital filter banks, as well as to methods and systems for the design of such filter banks. In particular, the present document proposes a method and apparatus for the improvement of low delay modulated digital filter banks. The method employs modulation of an asymmetric low-pass prototype filter and a new method for optimizing the coefficients of this filter. Further, a specific design for a 64 channel filter bank using a prototype filter length of 640 coefficients and a system delay of 319 samples is given. The method substantially reduces artifacts due to aliasing emerging from independent modifications of subband signals, for example when using a filter bank as a spectral equalizer. The method is preferably implemented in software, running on a standard PC or a digital signal processor (DSP), but can also be hardooded on a custom chip. The method offers improvements for various types of digital equalizers, adaptive filters, multiband companders and spectral envelope adjusting filter banks used in high frequency reconstruction (HFR) or parametric stereo systems.

COMPLEX-VALUED SYNTHESIS FILTER BANK WITH PHASE SHIFT

The document relates to modulated sub-sampled digital filter banks, as well as to methods and systems for the design of such filter banks. In particular, the present document proposes a method and apparatus for the improvement of low delay modulated digital filter banks. The method employs modulation of an asymmetric low-pass prototype filter and a new method for optimizing the coefficients of this filter. Further, a specific design for a 64 channel filter bank using a prototype filter length of 640 coefficients and a system delay of 319 samples is given. The method substantially reduces artifacts due to aliasing emerging from independent modifications of subband signals, for example when using a filter bank as a spectral equalizer. The method is preferably implemented in software, running on a standard PC or a digital signal processor (DSP), but can also be hardcoded on a custom chip. The method offers improvements for various types of digital equalizers, adaptive filters, multiband companders and spectral envelope adjusting filter banks used in high frequency reconstruction (HFR) or parametric stereo systems.

LOW DELAY MODULATED FILTER BANK

The document relates to modulated sub-sampled digital filter banks, as well as to methods and systems for the design of such filter banks. In particular, the present document proposes a method and apparatus for the improvement of low delay modulated digital filter banks. The method employs modulation of an asymmetric low-pass prototype filter and a new method for optimizing the coefficients of this filter. Further, a specific design for a 64 channel filter bank using a prototype filter length of 640 coefficients and a system delay of 319 samples is given. The method substantially reduces artifacts due to aliasing emerging from independent modifications of subband signals, for example when using a filter bank as a spectral equalizer. The method is preferably implemented in software, running on a standard PC or a digital signal processor (DSP), but can also be hardcoded on a custom chip. The method offers improvements for various types of digital equalizers, adaptive filters, multiband companders ...

LOW DELAY MODULATED FILTER BANK

The document relates to modulated sub-sampled digital filter banks, as well as to methods and systems for the design of such filter banks. In particular, the present document proposes a method and apparatus for the improvement of low delay modulated digital filter banks. The method employs modulation of an asymmetric low-pass prototype filter and a new method for optimizing the coefficients of this filter. Further, a specific design for a 64 channel filter bank using a prototype filter length of 640 coefficients and a system delay of 319 samples is given. The method substantially reduces artifacts due to aliasing emerging from independent modifications of subband signals, for example when using a filter bank as a spectral equalizer. The method is preferably implemented in software, running on a standard PC or a digital signal processor (DSP), but can also be hardcoded on a custom chip. The method offers improvements for various types of digital equalizers, adaptive filters, multiband companders ...

SELECTABLE BAND-PASS FILTERING APPARATUS AND METHOD

A selectable band-pass filtering apparatus for use at the input of analysis instrumentation such as a spectrum analyzer for testing a multi-channel communication system, comprises a high-pass filter section including a plurality of separate high-pass filters each characterized by a respective high-pass cut- off frequency within a predetermined input frequency spectrum characterizing the communication system. The apparatus further comprises a low-pass filter section including a plurality of separate low-pass filters each characterized by a corresponding low-pass cut-off frequency within the input frequency spectrum. The apparatus further switching devices capable of connecting a selected high- pass filter in series with a selected low-pass filter, to select a passband having center frequency and bandwidth characteristics defined by corresponding high-pass cut-off frequency and said low-pass cut-off frequency. The selected passband characteristics correspond to one or more selected channels used by the communication system, in a such way that the so connected filters generate a band-pass filtered communication signal corresponding to the selected channels. A manually or electronically operated control device is provided for operating the switching devices according to the selected filters. The apparatus can be build in the form of a portable, pocket-size instrument for field testing, or integrated within a spectrum analyzer. Related methods for selectively band- pass filtering an electrical signal, selectively band-pass filtering a communication signal to be fed to a spectrum analyzer for testing a multi-channel communication system and for spectrally analyzing a communication signal supplied by a multi-channel communication system, are presented.

고 주파수 재구성을 위한 복소 지수 변조 필터 뱅크

... 본 문서는 변조되고 서브-샘플링된 디지털 필터 뱅크들뿐만 아니라, 그와 같은 필터 뱅크들의 설계를 위한 방법들 및 시스템들에 관한 것이다. 특히, 본 문서는 저 지연 변조 디지털 필터 뱅크들의 개선을 위한 방법 및 장치를 제안한다. 상기 방법은 비대칭 저역 통과 프로토타입 필터의 변조 및 이 필터의 계수들을 최적화하기 위한 새로운 방법을 이용한다. 더욱이, 계수들(640)의 프로토타입 필터 길이 및 샘플들(319)의 시스템 지연을 이용하는 채널 필터 뱅크(64)에 대한 특정 설계가 제공된다. 상기 방법은 예를 들어 필터 뱅크를 스펙트럼 이퀄라이저로 이용할 때, 서브대역 신호들의 독자적인 변경들로부터 발생하는 에일리어싱으로 인한 아티팩트들을 실질적으로 감소시킨다. 상기 방법은 바람직하게도 표준 PC 또는 디지털 신호 프로세서(DSP)에서 운영되는 소프트웨어에서 구현되지만, 또한 주문형 칩에서 하드코딩될 수 있다. 상기 방법은 다양한 유형들의 디지털 이퀄라이저들, 적응형 필터들, 다중대역 압신기들 및 고주파 복원(HFR) 또는 파라메트릭 스테레오 시스템들에서 이용되는 필터 뱅크들을 조정하는 스펙트럼 포락선에 대한 개선들을 제공한다.

METHOD, SYSTEM, AND APPARATUS FOR WIDEBAND SIGNAL PROCESSING

Low Delay Modulated Filter Bank

The document relates to modulated sub-sampled digital filter banks, as well as to methods and systems for the design of such filter banks. In particular, the present document proposes a method and apparatus for the improvement of low delay modulated digital filter banks. The method employs modulation of an asymmetric low-pass prototype filter and a new method for optimizing the coefficients of this filter. Further, a specific design for a 64 channel filter bank using a prototype filter length of 640 coefficients and a system delay of 319 samples is given. The method substantially reduces artifacts due to aliasing emerging from independent modifications of subband signals, for example when using a filter bank as a spectral equalizer. The method is preferably implemented in software, running on a standard PC or a digital signal processor (DSP), but can also be hardcoded on a custom chip. The method offers improvements for various types of digital equalizers, adaptive filters, multiband companders ...

МНОГОКАНАЛЬНОЕ ЧАСТОТНО-ИЗБИРАТЕЛЬНОЕ УСТРОЙСТВО НА ПОВЕРХНОСТНЫХ АКУСТИЧЕСКИХ ВОЛНАХ

Изобретение относится к области радиоэлектроники и может быть использовано в приемных, передающих и других радиотехнических устройствах. Достигаемый технический результат - улучшение идентичности каналов при сохранении частотных характеристик устройства. Многоканальное частотно-избирательное устройство на поверхностных акустических волнах содержит блок управления, входной разветвитель, N канальных коммутаторов, частотно-избирательную матрицу на ПАВ с N входами и М выходами, выходной разветвитель, М канальных коммутаторов, N канальных усилителей, М канальных усилителей. 1 ил.

SURFACE ACOUSTIC WAVE DEVICES

COMPLEX EXPONENTIAL MODULATED FILTER BANK FOR HIGH FREQUENCY RECONSTRUCTION

... ²²The document relates to modulated sub-sampled digital filter banks, as well as ²to methods ²and systems for the design of such filter banks. In particular, the present ²document proposes ²a method and apparatus for the improvement of low delay modulated digital ²filter banks. ²The method employs modulation of an asymmetric low-pass prototype filter and a ²new ²method for optimizing the coefficients of this filter. Further, a specific ²design for a 64 ²channel filter bank using a prototype filter length of 640 coefficients and a ²system delay of ²319 samples is given. The method substantially reduces artifacts due to ²aliasing emerging ²from independent modifications of subband signals, for example when using a ²filter bank as ²a spectral equalizer. The method is preferably implemented in software, ²running on a ²standard PC or a digital signal processor (DSP), but can also be hardcoded on ²a custom ²chip. The method offers improvements for various types of digital equalizers, ²adaptive ...

COMPLEX EXPONENTIAL MODULATED FILTER BANK FOR HIGH FREQUENCY RECONSTRUCTION OR PARAMETRIC STEREO

The document relates to modulated sub-sampled digital filter banks, as well as to methods and systems for the design of such filter banks. In particular, the present document proposes a method and apparatus for the improvement of low delay modulated digital filter banks. The method employs modulation of an asymmetric low-pass prototype filter and a new method for optimizing the coefficients of this filter. Further, a specific design for a 64 channel filter bank using a prototype filter length of 640 coefficients and a system delay of 319 samples is given. The method substantially reduces artifacts due to aliasing emerging from independent modifications of subband signals, for example when using a filter bank as a spectral equalizer. The method is preferably implemented in software, running on a standard PC or a digital signal processor (DSP), but can also be hardcoded on a custom chip. The method offers improvements for various types of digital equalizers, adaptive filters, multiband companders and spectral envelope adjusting filter banks used in high frequency reconstruction (HFR) or parametric stereo systems.

LOW DELAY MODULATED FILTER BANK

The document relates to modulated sub-sampled digital filter banks, as well as to methods and systems for the design of such filter banks. In particular, the present document proposes a method and apparatus for the improvement of low delay modulated digital filter banks. The method employs modulation of an asymmetric low-pass prototype filter and a new method for optimizing the coefficients of this filter. Further, a specific design for a (64) channel filter bank using a prototype filter length of (640) coefficients and a system delay of (319) samples is given. The method substantially reduces artifacts due to aliasing emerging from independent modifications of subband signals, for example when using a filter bank as a spectral equalizer. The method is preferably implemented in software, running on a standard PC or a digital signal processor (DSP), but can also be hardcoded on a custom chip. The method offers improvements for various types of digital equalizers, adaptive filters, multiband ...

DEVICE OF FILTER AND SYSTEM OF RADIO HAS TWO BANDS IN WHICH THE DEVICE OF FILTER EAST USES

Un dispositif de filtre inclut au moins deux éléments de filtre (21, 22) prévus dans un module, chacun des éléments de filtre laissant passer seulement des signaux dans une bande de fréquences prédéterminée, les bandes de fréquences prédéterminées des éléments de filtre présentant des fréquences centrales (f1, f2) qui sont distinctes l'une de l'autre. Une borne d'entrée (T1) est connectée à des entrées respectives des éléments de filtre et est partagée par celles-ci et une borne de sortie (T3) est connectée à des sorties respectives des éléments de filtre et est partagée par celles-ci ...

저 지연 변조 필터 뱅크

... 본 문서는 변조되고 서브-샘플링된 디지털 필터 뱅크들뿐만 아니라, 그와 같은 필터 뱅크들의 설계를 위한 방법들 및 시스템들에 관한 것이다. 특히, 본 문서는 저 지연 변조 디지털 필터 뱅크들의 개선을 위한 방법 및 장치를 제안한다. 상기 방법은 비대칭 저역 통과 프로토타입 필터의 변조 및 이 필터의 계수들을 최적화하기 위한 새로운 방법을 이용한다. 더욱이, 계수들(640)의 프로토타입 필터 길이 및 샘플들(319)의 시스템 지연을 이용하는 채널 필터 뱅크(64)에 대한 특정 설계가 제공된다. 상기 방법은 예를 들어 필터 뱅크를 스펙트럼 이퀄라이저로 이용할 때, 서브대역 신호들의 독자적인 변경들로부터 발생하는 에일리어싱으로 인한 아티팩트들을 실질적으로 감소시킨다. 상기 방법은 바람직하게도 표준 PC 또는 디지털 신호 프로세서(DSP)에서 운영되는 소프트웨어에서 구현되지만, 또한 주문형 칩에서 하드코딩될 수 있다. 상기 방법은 다양한 유형들의 디지털 이퀄라이저들, 적응형 필터들, 다중대역 압신기들 및 고주파 복원(HFR) 또는 파라메트릭 스테레오 시스템들에서 이용되는 필터 뱅크들을 조정하는 스펙트럼 포락선에 대한 개선들을 제공한다.

Complex exponential modulated filter bank for high frequency reconstruction or parametric stereo

The document relates to modulated sub-sampled digital filter banks, as well as to methods and systems for the design of such filter banks. In particular, the present document proposes a method and apparatus for the improvement of low delay modulated digital filter banks. The method employs modulation of an asymmetric low-pass prototype filter and a new method for optimizing the coefficients of this filter. Further, a specific design for a 64 channel filter bank using a prototype filter length of 640 coefficients and a system delay of 319 samples is given. The method substantially reduces artifacts due to aliasing emerging from independent modifications of subband signals, for example when using a filter bank as a spectral equalizer. The method is preferably implemented in software, running on a standard PC or a digital signal processor (DSP), but can also be hardcoded on a custom chip. The method offers improvements for various types of digital equalizers, adaptive filters, multiband companders ...

METHOD, SYSTEM, AND APPARATUS FOR RESONATOR CIRCUITS AND MODULATING RESONATORS

Embodiments of resonator circuits and modulating resonators and are described generally herein. One or more acoustic wave resonators may be coupled in series or parallel to generate tunable filters. One or more acoustic wave resonances may be modulated by one or more capacitors or tunable capacitors. One or more acoustic wave modules may also be switchable in a filter. Other embodiments may be described and claimed.

METHODS, SYSTEMS, AND NON-TRANSITORY COMPUTER READABLE MEDIA FOR WIDEBAND FREQUENCY AND BANDWIDTH TUNABLE FILTERING

Methods, systems, and computer readable media for wideband frequency and bandwidth tunable filtering are disclosed. According to one aspect, the subject matter described herein includes a wideband frequency and bandwidth tunable filter that includes: a first signal path for receiving a first input signal from a filter input node and producing a first output signal; a second signal path for receiving a second input signal from the filter input node and producing a second output signal, the second signal path including a filter circuit for adjusting the frequency spectrum of the second output signal; a conditioning circuit for conditioning at least one of the first input signal and the second input signal; a compensation device for adjusting at least one of a phase of the first output signal relative to a phase of the second output signal and an amplitude of the first output signal relative to an amplitude of the second output signal; and a signal combiner for combining the first output signal ...

Multiband filter for non-contiguous channel aggregation

Methods and apparatus, including computer program products, are provided for receivers. In one aspect there is provided an apparatus. In some example embodiments, there is provided an apparatus. The apparatus may include a first N-path filter configured with at least a first passband, wherein the first N-path filter is coupled to a radio frequency input port providing at least a first carrier aggregation signal, a second carrier aggregation signal, and an interfering signal; a second N-path filter configured with at least a second passband, wherein the second N-path filter is coupled to the radio frequency input port providing at least the first carrier aggregation signal, the second carrier aggregation signal, and the interfering signal; and a combiner configured to subtract a first output of the first N-path filter from a second output of the second N-path filter. Related apparatus, systems, methods, and articles are also described.

High-frequency composite components comprising first and second circuits connected in parallel for multi-frequency systems

A high-frequency composite component used for a multi-band system, includes first and second circuits connected in parallel, the first and second circuits having infinite input impedances respectively at first and second frequencies, corresponding to first and second bands. Each of the first and second circuits includes a phase shifter, and a trap circuit connected as a load of the phase shifter. The phase shifter of each of the first and second circuits includes a strip line having a length of λ/4, wherein λ is a wavelength corresponding to one of the first and second frequencies. The trap circuit of each of the first and second circuits includes a series resonance circuit, and the trap circuit resonates at one of the first and second frequencies.

SURFACE ACOUSTIC WAVE DEVICE

LOW DELAY MODULATED FILTER BANK

The document relates to modulated sub-sampled digital filter banks, as well as to methods and systems for the design of such filter banks. In particular, the present document proposes a method and apparatus for the improvement of low delay modulated digital filter banks. The method employs modulation of an asymmetric low-pass prototype filter and a new method for optimizing the coefficients of this filter. Further, a specific design for a 64 channel filter bank using a prototype filter length of 640 coefficients and a system delay of 319 samples is given. The method substantially reduces artifacts due to aliasing emerging from independent modifications of subband signals, for example when using a filter bank as a spectral equalizer. The method is preferably implemented in software, running on a standard PC or a digital signal processor (DSP), but can also be hardcoded on a custom chip. The method offers improvements for various types of digital equalizers, adaptive filters, multiband companders and spectral envelope adjusting filter banks used in high frequency reconstruction (HFR) or parametric stereo systems.

LOW DELAY MODULATED FILTER BANK

The document relates to modulated sub-sampled digital filter banks, as well as to methods and systems for the design of such filter banks. In particular, the present document proposes a method and apparatus for the improvement of low delay modulated digital filter banks. The method employs modulation of an asymmetric low-pass prototype filter and a new method for optimizing the coefficients of this filter. Further, a specific design for a (64) channel filter bank using a prototype filter length of (640) coefficients and a system delay of (319) samples is given. The method substantially reduces artifacts due to aliasing emerging from independent modifications of subband signals, for example when using a filter bank as a spectral equalizer. The method is preferably implemented in software, running on a standard PC or a digital signal processor (DSP), but can also be hardcoded on a custom chip. The method offers improvements for various types of digital equalizers, adaptive filters, multiband ...

COMPLEX-VALUED SYNTHESIS FILTER BANK WITH PHASE SHIFT

The document relates to modulated sub-sampled digital filter banks, as well as to methods and systems for the design of such filter banks. In particular, the present document proposes a method and apparatus for the improvement of low delay modulated digital filter banks. The method employs modulation of an asymmetric low-pass prototype filter and a new method for optimizing the coefficients of this filter. Further, a specific design for a 64 channel filter bank using a prototype filter length of 640 coefficients and a system delay of 319 samples is given. The method substantially reduces artifacts due to aliasing emerging from independent modifications of subband signals, for example when using a filter bank as a spectral equalizer. The method is preferably implemented in software, running on a standard PC or a digital signal processor (DSP), but can also be hardcoded on a custom chip. The method offers improvements for various types of digital equalizers, adaptive filters, multiband companders ...

COMPLEX EXPONENTIAL MODULATED FILTER BANK FOR HIGH FREQUENCY RECONSTRUCTION OR PARAMETRIC STEREO

The document relates to modulated sub-sampled digital filter banks, as well as to methods and systems for the design of such filter banks. In particular, the present document proposes a method and apparatus for the improvement of low delay modulated digital filter banks. The method employs modulation of an asymmetric low-pass prototype filter and a new method for optimizing the coefficients of this filter. Further, a specific design for a 64 channel filter bank using a prototype filter length of 640 coefficients and a system delay of 319 samples is given. The method substantially reduces artifacts due to aliasing emerging from independent modifications of subband signals, for example when using a filter bank as a spectral equalizer. The method is preferably implemented in software, running on a standard PC or a digital signal processor (DSP), but can also be hardcoded on a custom chip. The method offers improvements for various types of digital equalizers, adaptive filters, multiband companders ...

Filter device and dual-band radio system used in said filter device

DEVICE OF FILTER AND SYSTEM OF RADIO HAS TWO BANDS IN WHICH THE DEVICE OF FILTER EAST USES

APPARATUS AND METHOD FOR IMPROVING CHANNEL FILTER SELECTIVITY AND PERFORMANCE USING VOLTAGE VARIABLE IMPEDANCE ELEMENTS

MULTIPLE RESPONSE FILTERING APPARATUS

Filtering apparatus (1; 1') comprising distribution means (2, 7, 6; 9, 12), with an inlet port (21; 91) and a plurality of outlet ports (23, 22, 63; 92, 122), suitable to distribute inlet signals on at least a first assembly of said outlet ports plurality (23, 22, 63; 92, 122) and to further distribute signal reflected from said at least a first assembly on at least a second assembly of said plurality of outlet ports (23, 22, 63; 92, 122); filtering units (41, 42; 101, 102, 103), having first and second terminals, each filtering unit (41, 42: 101, 102, 103) being connected by said first terminals to outlet ports (23, 22, 63; 92, 122) of said distribution means (2, 7, 6; 9, 12) and suitable to carry out a filtering operation of a signal on said first terminals and on said second terminals and reflecting the remaining part of the signal; and combination means (5, 7; 11, 13, 14) with inlet ports (52, 53, 72, 73; 111, 131, 141) connected with second terminals of said filtering units (41, 42 ...

Low delay modulated filter bank

The document relates to modulated sub-sampled digital filter banks, as well as to methods and systems for the design of such filter banks. In particular, the present document proposes a method and apparatus for the improvement of low delay modulated digital filter banks. The method employs modulation of an asymmetric low-pass prototype filter and a new method for optimizing the coefficients of this filter. Further, a specific design for a 64 channel filter bank using a prototype filter length of 640 coefficients and a system delay of 319 samples is given. The method substantially reduces artifacts due to aliasing emerging from independent modifications of subband signals, for example when using a filter bank as a spectral equalizer. The method is preferably implemented in software, running on a standard PC or a digital signal processor (DSP), but can also be hardcoded on a custom chip. The method offers improvements for various types of digital equalizers, adaptive filters, multiband companders ...

Complex Exponential Modulated Filter Bank for High Frequency Reconstruction or Parametric Stereo

An apparatus and method are disclosed for filtering and performing high frequency reconstruction of an audio signal. The apparatus includes an analysis filter bank, a phase shifter, a high frequency reconstructor, and a synthesis filter bank. The analysis filterbank receives real-valued time domain input audio samples and generates complex valued subband samples. The phase shifter shifts a phase of the complex-valued subband samples by an arbitrary amount. The high frequency reconstructor modifies at least some of the complex valued subband samples. A phase shifter unshifts a phase of the modified complex-valued subband samples by the arbitrary amount. The synthesis filter bank receives the modified complex valued subband samples and generates time domain output audio samples. The analysis filter bank comprises analysis filters that are complex exponential modulated versions of a prototype filter with an arbitrary phase shift.

FILTER DEVICE AND DUPLEXER

A filter device includes a band pass filter connected between a first signal terminal and a second signal terminal and an LC circuit connected in parallel with the band pass filter. The LC circuit has anti-resonant characteristics that make the LC circuit be open at a pass band of the band pass filter, and make attenuation in a specified frequency band outside of the pass band of the band pass filter higher than in a case in which the LC circuit is not connected, as a result of the LC circuit being connected.

Low delay modulated filter bank

The document relates to modulated sub-sampled digital filter banks, as well as to methods and systems for the design of such filter banks. In particular, the present document proposes a method and apparatus for the improvement of low delay modulated digital filter banks. The method employs modulation of an asymmetric low-pass prototype filter and a new method for optimizing the coefficients of this filter. Further, a specific design for a (64) channel filter bank using a prototype filter length of (640) coefficients and a system delay of (319) samples is given. The method substantially reduces artifacts due to aliasing emerging from independent modifications of subband signals, for example when using a filter bank as a spectral equalizer. The method is preferably implemented in software, running on a standard PC or a digital signal processor (DSP), but can also be hardcoded on a custom chip. The method offers improvements for various types of digital equalizers, adaptive filters, multiband ...

Transducteurs électrique/acoustique et acoustique/électrique pour dispositif à ondes de surface à diffraction réduite et dispositif à ondes de surface correspondant

L'invention concerne des transducteurs électrique/acoustique d'entrée et acoustique/électrique de sortie, en particulier pour dispositif à ondes de surface, du type comprenant, sur une grande face d'un substrat piézo-électrique plan : - deux plages conductrices d'entrée 15, 16 ou de sortie, séparées par un ruban 10 de substrat, sur lequel elles étendent des doigts parallèles respectifs 11, 12 qui s'imbriquent selon un motif choisi pour former une rangée de doigts le long de ce ruban; - la direction générale du ruban 10 étant inclinée sur la direction des doigts; - des moyens électriques d'entrée pour appliquer des signaux de haute fréquence entre les plages, de façon à former des sources d'ondes acoustiques de surface sur le substrat, ou de sortie pour extraire les signaux détectés par le dispositif. Selon l'invention, l'une au moins des deux plages conductrices d'entrée ou de sortie est subdivisée en sous-plages, électriquement séparées, tandis que les moyens électriques d'entrée comprennent ...

COMPLEX EXPONENTIAL MODULATED FILTER BANK FOR HIGH FREQUENCY RECONSTRUCTION OR PARAMETRIC STEREO

Surface acoustic wave device and communication apparatus

A plurality of surface acoustic wave filters having different center frequencies is provided on a piezoelectric substrate. Either input terminals or output terminals, or both input terminals and output terminals of the surface acoustic wave filters are integrated. Of the surface acoustic wave filters, a surface acoustic wave filter having a higher center frequency is configured so as to suppress a spurious response in the proximity of the high-frequency side in or outside a passband in the filter characteristics of a surface acoustic wave filter having a lower center frequency, for example, such that the width or pitch of electrode fingers in at least one region of reflectors differs from that in other regions.

Method, System, and Apparatus for Resonator Circuits and Modulating Resonators

Embodiments of resonator circuits and modulating resonators and are described generally herein. One or more acoustic wave resonators may be coupled in series or parallel to generate tunable filters. One or more acoustic wave resonances may be modulated by one or more capacitors or tunable capacitors. One or more acoustic wave modules may also be switchable in a filter. Other embodiments may be described and claimed.

Surface acoustic wave filter circuit having plural passing bands

COMPLEX EXPONENTIAL MODULATED FILTER BANK FOR HIGH FREQUENCY RECONSTRUCTION OR PARAMETRIC STEREO

The document relates to modulated sub-sampled digital filter banks, as well as to methods and systems for the design of such filter banks. In particular, the present document proposes a method and apparatus for the improvement of low delay modulated digital filter banks. The method employs modulation of an asymmetric low-pass prototype filter and a new method for optimizing the coefficients of this filter. Further, a specific design for a 64 channel filter bank using a prototype filter length of 640 coefficients and a system delay of 319 samples is given. The method substantially reduces artifacts due to aliasing emerging from independent modifications of subband signals, for example when using a filter bank as a spectral equalizer. The method is preferably implemented in software, running on a standard PC or a digital signal processor (DSP), but can also be hardcoded on a custom chip. The method offers improvements for various types of digital equalizers, adaptive filters, multiband companders ...

TRANSDUCERS ELECTRIQUE/ACOUSTIQUE AND ACOUSTIQUE/ELECTRIQUE FOR DEVICE HAS WAVES OF SURFACE HAS REDUCED DIFFRACTION AND DEVICE HAS WAVES OF SURFACE CORRESPONDING

Band rejection filter for e.g. digital video broadcasting - handheld TV receiver, has secondary signal transmission channel comprising resonant element and negative resistance circuit that reduces insertion loss of filter

The filter (20) has a direct signal transmission channel (23) and a secondary signal transmission channel (24) arranged between a filter input (21) and a filter output (22), where the filter is formed on an FR4 substrate. The secondary channel has a resonant element whose resonant frequency is equal to a rejection frequency. The channels introduce, at the rejection frequency, a phase difference of 180 degrees between signals circulating through the direct and secondary channels. The secondary channel has a negative resistance circuit (246) to reduce insertion loss of the filter.

고 주파수 재구성 또는 파라메트릭 스테레오를 위한 복소 지수 변조 필터 뱅크

본 문서는 변조되고 서브-샘플링된 디지털 필터 뱅크들뿐만 아니라, 그와 같은 필터 뱅크들의 설계를 위한 방법들 및 시스템들에 관한 것이다. 특히, 본 문서는 저 지연 변조 디지털 필터 뱅크들의 개선을 위한 방법 및 장치를 제안한다. 상기 방법은 비대칭 저역 통과 프로토타입 필터의 변조 및 이 필터의 계수들을 최적화하기 위한 새로운 방법을 이용한다. 더욱이, 계수들(640)의 프로토타입 필터 길이 및 샘플들(319)의 시스템 지연을 이용하는 채널 필터 뱅크(64)에 대한 특정 설계가 제공된다. 상기 방법은 예를 들어 필터 뱅크를 스펙트럼 이퀄라이저로 이용할 때, 서브대역 신호들의 독자적인 변경들로부터 발생하는 에일리어싱으로 인한 아티팩트들을 실질적으로 감소시킨다. 상기 방법은 바람직하게도 표준 PC 또는 디지털 신호 프로세서(DSP)에서 운영되는 소프트웨어에서 구현되지만, 또한 주문형 칩에서 하드코딩될 수 있다. 상기 방법은 다양한 유형들의 디지털 이퀄라이저들, 적응형 필터들, 다중대역 압신기들 및 고주파 복원(HFR) 또는 파라메트릭 스테레오 시스템들에서 이용되는 필터 뱅크들을 조정하는 스펙트럼 포락선에 대한 개선들을 제공한다. This document relates to modulated and sub-sampled digital filter banks as well as methods and systems for designing such filter banks. In particular, this document proposes a method and apparatus for improvement of low delay modulation digital filter banks. The method uses a new method for modulating the asymmetric low-pass prototype filter and for optimizing the coefficients of this filter. Moreover, a specific design for the channel filter bank 64 utilizing the prototype filter length of the coefficients 640 and the system delay of the samples 319 is provided. The method substantially reduces artifacts due to aliasing resulting from unique modifications of subband signals, for example when using a filter bank as a spectrum equalizer. The method is preferably implemented in software running on a standard PC or a digital signal processor (DSP), but may also be hard coded on a custom chip. The method provides improvements for various types of digital equalizers, adaptive filters, multiband compressors, and spectral envelopes that adjust filter banks used in high frequency reconstruction (HFR) or parametric stereo systems.

고 주파수 재구성 또는 파라메트릭 스테레오를 위한 복소 지수 변조 필터 뱅크

... 본 문서는 변조되고 서브-샘플링된 디지털 필터 뱅크들뿐만 아니라, 그와 같은 필터 뱅크들의 설계를 위한 방법들 및 시스템들에 관한 것이다. 특히, 본 문서는 저 지연 변조 디지털 필터 뱅크들의 개선을 위한 방법 및 장치를 제안한다. 상기 방법은 비대칭 저역 통과 프로토타입 필터의 변조 및 이 필터의 계수들을 최적화하기 위한 새로운 방법을 이용한다. 더욱이, 계수들(640)의 프로토타입 필터 길이 및 샘플들(319)의 시스템 지연을 이용하는 채널 필터 뱅크(64)에 대한 특정 설계가 제공된다. 상기 방법은 예를 들어 필터 뱅크를 스펙트럼 이퀄라이저로 이용할 때, 서브대역 신호들의 독자적인 변경들로부터 발생하는 에일리어싱으로 인한 아티팩트들을 실질적으로 감소시킨다. 상기 방법은 바람직하게도 표준 PC 또는 디지털 신호 프로세서(DSP)에서 운영되는 소프트웨어에서 구현되지만, 또한 주문형 칩에서 하드코딩될 수 있다. 상기 방법은 다양한 유형들의 디지털 이퀄라이저들, 적응형 필터들, 다중대역 압신기들 및 고주파 복원(HFR) 또는 파라메트릭 스테레오 시스템들에서 이용되는 필터 뱅크들을 조정하는 스펙트럼 포락선에 대한 개선들을 제공한다.

저 지연 변조 필터 뱅크

... 본 문서는 변조되고 서브-샘플링된 디지털 필터 뱅크들뿐만 아니라, 그와 같은 필터 뱅크들의 설계를 위한 방법들 및 시스템들에 관한 것이다. 특히, 본 문서는 저 지연 변조 디지털 필터 뱅크들의 개선을 위한 방법 및 장치를 제안한다. 상기 방법은 비대칭 저역 통과 프로토타입 필터의 변조 및 이 필터의 계수들을 최적화하기 위한 새로운 방법을 이용한다. 더욱이, 계수들(640)의 프로토타입 필터 길이 및 샘플들(319)의 시스템 지연을 이용하는 채널 필터 뱅크(64)에 대한 특정 설계가 제공된다. 상기 방법은 예를 들어 필터 뱅크를 스펙트럼 이퀄라이저로 이용할 때, 서브대역 신호들의 독자적인 변경들로부터 발생하는 에일리어싱으로 인한 아티팩트들을 실질적으로 감소시킨다. 상기 방법은 바람직하게도 표준 PC 또는 디지털 신호 프로세서(DSP)에서 운영되는 소프트웨어에서 구현되지만, 또한 주문형 칩에서 하드코딩될 수 있다. 상기 방법은 다양한 유형들의 디지털 이퀄라이저들, 적응형 필터들, 다중대역 압신기들 및 고주파 복원(HFR) 또는 파라메트릭 스테레오 시스템들에서 이용되는 필터 뱅크들을 조정하는 스펙트럼 포락선에 대한 개선들을 제공한다.

Complex-Valued Synthesis Filter Bank with Phase Shift

An apparatus for generating real-valued output audio samples is disclosed. The apparatus includes a memory that stores complex-valued input subband samples, real-valued demodulated samples, and the real-valued output audio samples. The apparatus also incudes a phase shifter that shifts a phase of the complex-valued input subband samples by an amount equal to a previously added phase shift and a complex-valued synthesis filter bank that generates the real-valued output audio samples in response to the complex-valued input subband samples, the real-valued demodulated samples, and prototype filter coefficients.

Frequency multiplexer

An apparatus is disclosed that includes a frequency multiplexer circuit coupled to an input node and configured to receive an input signal via the input node. The frequency multiplexer circuit comprises a first filter circuit, a second filter circuit, and a third filter circuit. The apparatus also includes a switching circuit that is configurable to couple at least two of a first output of the first filter circuit, a second output of the second filter circuit, or a third output of the third filter circuit to a single output port.

Attenuation element

The invention relates to an attenuation element. According to the invention, this attenuation element has two rail pieces ( 46, 48 ) and two conducting pieces ( 50, 52 ), wherein a rail piece ( 46, 48 ) and a conducting piece ( 50, 52 ) each are electrically connected in parallel, wherein these rail pieces ( 46, 48 ) are spatially disposed in parallel at a distance from each other, and wherein the conducting pieces ( 50, 52 ) each are made of electrically highly conductive material, and the rail pieces ( 46, 48 ) each are made of an electrically poorly conductive material. In this manner, the high-frequency currents can be substantially attenuated in a rectifier having distributed intermediate voltage circuits without the power loss in the intermediate voltage circuit markedly increasing such that the capacitors ( 10, 12, 24, 28 ) of the rectifier having distributed intermediate voltage circuits no longer need to be oversized with regard to an RMS current of the intermediate voltage circuit of this rectifier.

METHODS, SYSTEMS, AND NON-TRANSITORY COMPUTER READABLE MEDIA FOR WIDEBAND FREQUENCY AND BANDWIDTH TUNABLE FILTERING

Low delay modulated filter bank

The document relates to modulated sub-sampled digital filter banks, as well as to methods and systems for the design of such filter banks. In particular, the present document proposes a method and apparatus for the improvement of low delay modulated digital filter banks. The method employs modulation of an asymmetric low-pass prototype filter and a new method for optimizing the coefficients of this filter. Further, a specific design for a (64) channel filter bank using a prototype filter length of (640) coefficients and a system delay of (319) samples is given. The method substantially reduces artifacts due to aliasing emerging from independent modifications of subband signals, for example when using a filter bank as a spectral equalizer. The method is preferably implemented in software, running on a standard PC or a digital signal processor (DSP), but can also be hardcoded on a custom chip. The method offers improvements for various types of digital equalizers, adaptive filters, multiband ...

COMPLEX EXPONENTIAL MODULATED FILTER BANK FOR HIGH FREQUENCY RECONSTRUCTION

The document relates to modulated sub-sampled digital filter banks, as well as to methods and systems for the design of such filter banks. In particular, the present document proposes a method and apparatus for the improvement of low delay modulated digital filter banks. The method employs modulation of an asymmetric low-pass prototype filter and a new method for optimizing the coefficients of this filter. Further, a specific design for a 64 channel filter bank using a prototype filter length of 640 coefficients and a system delay of 319 samples is given. The method substantially reduces artifacts due to aliasing emerging from independent modifications of subband signals, for example when using a filter bank as a spectral equalizer. The method is preferably implemented in software, running on a standard PC or a digital signal processor (DSP), but can also be hardcoded on a custom chip. The method offers improvements for various types of digital equalizers, adaptive filters, multiband companders ...

COMPLEX EXPONENTIAL MODULATED FILTER BANK FOR HIGH FREQUENCY RECONSTRUCTION OR PARAMETRIC STEREO

Signal processing devices and methods filter and process an audio signal. A signal processing device includes a high frequency reconstructor or a parametric stereo processor that generates modified complex-valued subband sample; and a synthesis filter bank that receives the modified complex-valued subband samples and generates time domain output audio samples. The analysis filter bank comprises analysis filters (h k(n)) and the synthesis filter bank comprises synthesis filters (f k(n)) that are complex exponential modulated versions of a prototype filter (p0(n)) that has a length N. The analysis filter bank and synthesis filter bank have a system delay of D samples, wherein D is smaller than N. This structure can provide a reduced overall delay.

COMPLEX EXPONENTIAL MODULATED FILTER BANK FOR HIGH FREQUENCY RECONSTRUCTION

The document relates to modulated sub-sampled digital filter banks, as well as to methods and systems for the design of such filter banks. In particular, the present document proposes a method and apparatus for the improvement of low delay modulated digital filter banks. The method employs modulation of an asymmetric low-pass prototype filter and a new method for optimizing the coefficients of this filter. Further, a specific design for a 64 channel filter bank using a prototype filter length of 640 coefficients and a system delay of 319 samples is given. The method substantially reduces artifacts due to aliasing emerging from independent modifications of subband signals, for example when using a filter bank as a spectral equalizer. The method is preferably implemented in software, running on a standard PC or a digital signal processor (DSP), but can also be hardcoded on a custom chip. The method offers improvements for various types of digital equalizers, adaptive filters, multiband companders ...

DEVICES OF FILTERING OF MULTIPLE REPLY

Low delay modulated filter bank and method for the design of the low delay modulated filter bank

The document relates to modulated sub-sampled digital filter banks, as well as to methods and systems for the design of such filter banks. In particular, the present document proposes a method and apparatus for the improvement of low delay modulated digital filter banks. The method employs modulation of an asymmetric low-pass prototype filter and a new method for optimizing the coefficients of this filter. Further, a specific design for a 64 channel filter bank using a prototype filter length of 640 coefficients and a system delay of 319 samples is given. The method substantially reduces artifacts due to aliasing emerging from independent modifications of subband signals, for example when using a filter bank as a spectral equalizer. The method is preferably implemented in software, running on a standard PC or a digital signal processor (DSP), but can also be hardcoded on a custom chip. The method offers improvements for various types of digital equalizers, adaptive filters, multiband companders ...

Communications filter package for narrowband and wideband signal waveforms

A filter package for communications equipment includes two or more filters in die form, each having a different frequency response. A first switch and a second switch are operatively connected to the filters and are configured to select a desired filter for operation in a signal stage of the equipment. The filters are aligned and stacked one over the other in the form of a package having an input terminal that is tied to a common terminal of the first switch, and an output terminal tied to a common terminal of the second switch. When the input and the output terminals of the filter package are connected to corresponding terminals of an intermediate frequency (IF) stage in a communications transceiver, the package can support both narrowband and wideband waveforms defined by the Joint Tactical Radio System (JTRS).

Method, System, and Apparatus for Resonator Circuits and Modulating Resonators

Embodiments of resonator circuits and modulating resonators and are described generally herein. One or more acoustic wave resonators may be coupled in series or parallel to generate tunable filters. One or more acoustic wave resonances may be modulated by one or more capacitors or tunable capacitors. One or more acoustic wave modules may also be switchable in a filter. Other embodiments may be described and claimed. 1. A filter module for providing a pass-band and a tunable rejection band , comprising:an acoustic wave resonator (AWR), the AWR having a resonant frequency (RFA) and an anti-resonant frequency (AFA); anda capacitor module coupled in parallel to the AWR, the capacitor module configured to modify the transduction of the electrical signal by the AWR.2. A filter module for providing a tunable pass-band and a tunable rejection band , comprising:an acoustic wave resonator (AWR), the AWR having a resonant frequency (RFA) and an anti-resonant frequency (AFA);a first capacitor module coupled in parallel to the AWR, the first capacitor module configured to modify the transduction of the electrical signal by the AWR; anda second capacitor module coupled in series to the AWR and the first capacitor module, the second capacitor module configured to modify the transduction of the electrical signal by the AWR.3. The filter module of claim 1 , wherein the capacitor modifies at least one of the AFA and RFA.4. The filter module of claim 2 , wherein the first capacitor module or the second capacitor module or a combination thereof modifies at least one of the RFA and AFA.5. The filter module of claim 1 , wherein the capacitor module is a variable capacitor.6. The filter module of claim 2 , wherein at least one of the first capacitor module and the second capacitor module are variable capacitors.7. A filter module for providing a switchable pass-band and a tunable rejection band claim 2 , the filter module comprising:an acoustic wave resonator (AWR), the AWR having a ...

Method, System, and Apparatus for Resonator Circuits and Modulating Resonators

Embodiments of resonator circuits and modulating resonators and are described generally herein. One or more acoustic wave resonators may be coupled in series or parallel to generate tunable filters. One or more acoustic wave resonances may be modulated by one or more capacitors or tunable capacitors. One or more acoustic wave modules may also be switchable in a filter. Other embodiments may be described and claimed. 1. A filter module for providing a pass-band and a tunable rejection band , comprising:an acoustic wave resonator (AWR), the AWR having a resonant frequency (RFA) and an anti-resonant frequency (AFA); anda capacitor module coupled in parallel to the AWR, the capacitor module configured to modify the transduction of the electrical signal by the AWR.2. A filter module for providing a tunable pass-band and a tunable rejection band , comprising:an acoustic wave resonator (AWR), the AWR having a resonant frequency (RFA) and an anti-resonant frequency (AFA);a first capacitor module coupled in parallel to the AWR, the first capacitor module configured to modify the transduction of the electrical signal by the AWR; anda second capacitor module coupled in series to the AWR and the first capacitor module, the second capacitor module configured to modify the transduction of the electrical signal by the AWR.3. The filter module of claim 1 , wherein the capacitor modifies at least one of the AFA and RFA.4. The filter module of claim 2 , wherein the first capacitor module or the second capacitor module or a combination thereof modifies at least one of the RFA and AFA.5. The filter module of claim 1 , wherein the capacitor module is a variable capacitor.6. The filter module of claim 2 , wherein at least one of the first capacitor module and the second capacitor module are variable capacitors.7. A filter module for providing a switchable pass-band and a tunable rejection band claim 2 , the filter module comprising:an acoustic wave resonator (AWR), the AWR having a ...

A filter that minimizes in-band noise and maximizes detection sensitivity of exponentially-modulated signals

The trans-filter compresses in band AWGN, demodulates input signals and has no threshold due to applied noise. Two frequency selective networks with opposite amplitude vs frequency slopes are designed to remain 180 degrees out of phase over the signal band. Output amplitudes are equal at band center and are summed producing a monotonic amplitude vs frequency characteristic going thru zero at center frequency with abrupt phase reversal. This produces the parabolic output noise density and differentiates applied signals. Absence of nonlinear circuit components and product devices prevents generation of noise x noise products, avoiding the threshold phenomenon. Exponentially modulated digital signals produce output impulses due to the slope and abrupt phase reversal. The impulses have strong fundamental frequency components and may be recovered at baseband without frequency conversion. Cascading trans-filters increases noise reduction and impulse amplitude. The trans-filter algorithm may be used separately or in conjunction with one or more hardware trans-filters.

Time division interleaving band-pass filter for use in voice activity detection

In one aspect, a time division interleaving band-pass filter can be used in voice activity detection, which operates at different central frequencies in respective intervals of a predetermined period of time. The band-pass filter circuitry includes multiple band-pass filtering channels sharing a common transistor circuit, bias circuit and current mirror circuit. The multiple band-pass filtering channels operate in a time division interleaving manner, which enables the sharing of the common set of band-pass filter circuitry components. Thus, the present invention allows a reduced chip area as the area does not increase proportionally with the number of filtering channels. The invention also mitigates the influence of transistor fabrication variations on the filter's central frequencies. Moreover, pulse durations ti are additionally introduced to the determination of the central frequencies, dispensing with the need for matching of current mirror circuits and transistors and resulting in higher accuracy of the band-pass filter's central frequencies.

Discrete Time IIR Filter With High Stop Band Rejection

A novel and useful high-order discrete-time charge rotating (CR) infinite impulse response (IIR) low pass filter is presented. The filter utilizes history capacitor arrays incorporating banks of capacitors. A linear interpolation technique is used in the IIR filter with second order antialiasing filtering, whose transfer function is sinc(x) 2 per stage. It also uses a g m cell, rather than operational amplifiers, and is thus compatible with digital nanoscale technology. A 7 th -order charge-sampling discrete time filter is disclosed. The order of the filter is easily extendable to higher orders. The charge rotating filter is process scalable with Moore's law and amenable to digital nanoscale CMOS technology. Bandwidth of the filter is precise and robust to PVT variation. The filter exhibits very low power consumption per filter pole, low input-referred noise, wide tuning range, excellent linearity and low area per minimum bandwidth and filter pole.

Method and apparatus for signal processing

A method and an apparatus for signal processing: implementing step-by-step orthogonal decomposition of an original signal to be inputted; on the basis of the number of layers of orthogonal decomposition and the edge high frequency bandwidth of the original signal after orthogonal decomposition, generating a finite-length unit impulse response FIR filter; using the FIR filter to filter the edge high-frequency signal of the original signal; and, after passing the signal obtained after filtering and the low frequency signal obtained at each stage of orthogonal decomposition through an orthogonal filter bank, implementing signal synthesis processing.

Vector inductor having multiple mutually coupled metalization layers providing high quality factor

An inductor component includes a plurality of conductive elements, each formed as an individual patch of conductive material, with the conductive elements arranged in a vertical stack and tightly coupled to one another. Dielectric is disposed between more adjacent conductive elements, the dielectric has a permittivity and is sufficiently thin so as to provide a mutual inductance factor of at least one-half or greater between adjacent ones of the conductive elements. The dielectric is typically thinner than the adjacent conductors.

Low Delay Modulated Filter Bank

The document relates to modulated sub-sampled digital filter banks, as well as to methods and systems for the design of such filter banks. In particular, the present document proposes a method and apparatus for the improvement of low delay modulated digital filter banks. The method employs modulation of an asymmetric low-pass prototype filter and a new method for optimizing the coefficients of this filter. Further, a specific design for a 64 channel filter bank using a prototype filter length of 640 coefficients and a system delay of 319 samples is given. The method substantially reduces artifacts due to aliasing emerging from independent modifications of subband signals, for example when using a filter bank as a spectral equalizer. The method is preferably implemented in software, running on a standard PC or a digital signal processor (DSP), but can also be hardcoded on a custom chip. The method offers improvements for various types of digital equalizers, adaptive filters, multiband companders and spectral envelope adjusting filter banks used in high frequency reconstruction (HFR) or parametric stereo systems.

Hearing device with adaptive filter and method of filtering an audio signal

Low delay modulated filter bank

FIELD: radio engineering, communication. SUBSTANCE: specific design for a (64) channel filter bank using a prototype filter length of (640) coefficients and a system delay of (319) samples is described. The method substantially reduces artifacts due to spectrum aliasing arising from independent modifications of subband signals, for example when using a filter bank as a spectral equaliser. The method is preferably implemented in software, running on a standard PC or a digital signal processor (DSP), but can also be hardcoded on a custom chip. The method offers improvements for various types of digital equalisers, adaptive filters, multiband companders and spectral envelope adjusting filter banks used in high frequency reconstruction (HFR) or parametric stereo systems. EFFECT: method of reconstructing filter banks generating a low level of errors. 21 cl, 1 tbl, 5 dwg РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) 2 484 579 (13) C2 (51) МПК H03H 17/02 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (21)(22) Заявка: 2011134419/08, 17.02.2010 (24) Дата начала отсчета срока действия патента: 17.02.2010 (73) Патентообладатель(и): ДОЛБИ ИНТЕРНЕШНЛ АБ (NL) R U Приоритет(ы): (30) Конвенционный приоритет: 18.02.2009 SE 0900217-1 02.11.2009 US 61/257,105 (72) Автор(ы): ЭКСТРАНД Пер (SE) (45) Опубликовано: 10.06.2013 Бюл. № 16 2 4 8 4 5 7 9 (56) Список документов, цитированных в отчете о поиске: ЕР 0874458 А2, 28.10.1998. RU 2297049 С2, 10.04.2007. RU 2125764 C1, 27.01.1999. RU 2145464 C1, 10.02.2000. (85) Дата начала рассмотрения заявки PCT на национальной фазе: 19.09.2011 2 4 8 4 5 7 9 R U (87) Публикация заявки РСТ: WO 2010/094710 (26.08.2010) C 2 C 2 (86) Заявка PCT: EP 2010/051993 (17.02.2010) Адрес для переписки: 123242, Москва, Кудринская площадь, 1, а/я 35, "Михайлюк, Сороколат и партнерыпатентные поверенные" (54) БЛОК МОДУЛИРОВАННЫХ ФИЛЬТРОВ С МАЛЫМ ЗАПАЗДЫВАНИЕМ (57) Реферат: Изобретение относится к блокам модулированных ...

Complex exponential modulated filter bank for high frequency reconstruction or parametric stereo

본 문서는 변조되고 서브-샘플링된 디지털 필터 뱅크들뿐만 아니라, 그와 같은 필터 뱅크들의 설계를 위한 방법들 및 시스템들에 관한 것이다. 특히, 본 문서는 저 지연 변조 디지털 필터 뱅크들의 개선을 위한 방법 및 장치를 제안한다. 상기 방법은 비대칭 저역 통과 프로토타입 필터의 변조 및 이 필터의 계수들을 최적화하기 위한 새로운 방법을 이용한다. 더욱이, 계수들(640)의 프로토타입 필터 길이 및 샘플들(319)의 시스템 지연을 이용하는 채널 필터 뱅크(64)에 대한 특정 설계가 제공된다. 상기 방법은 예를 들어 필터 뱅크를 스펙트럼 이퀄라이저로 이용할 때, 서브대역 신호들의 독자적인 변경들로부터 발생하는 에일리어싱으로 인한 아티팩트들을 실질적으로 감소시킨다. 상기 방법은 바람직하게도 표준 PC 또는 디지털 신호 프로세서(DSP)에서 운영되는 소프트웨어에서 구현되지만, 또한 주문형 칩에서 하드코딩될 수 있다. 상기 방법은 다양한 유형들의 디지털 이퀄라이저들, 적응형 필터들, 다중대역 압신기들 및 고주파 복원(HFR) 또는 파라메트릭 스테레오 시스템들에서 이용되는 필터 뱅크들을 조정하는 스펙트럼 포락선에 대한 개선들을 제공한다. This document relates to modulated and sub-sampled digital filter banks as well as methods and systems for designing such filter banks. In particular, this document proposes a method and apparatus for improvement of low delay modulation digital filter banks. The method uses a new method for modulating the asymmetric low-pass prototype filter and for optimizing the coefficients of this filter. Moreover, a specific design for the channel filter bank 64 utilizing the prototype filter length of the coefficients 640 and the system delay of the samples 319 is provided. The method substantially reduces artifacts due to aliasing resulting from unique modifications of subband signals, for example when using a filter bank as a spectrum equalizer. The method is preferably implemented in software running on a standard PC or a digital signal processor (DSP), but may also be hard coded on a custom chip. The method provides improvements for various types of digital equalizers, adaptive filters, multiband compressors, and spectral envelopes that adjust filter banks used in high frequency reconstruction (HFR) or parametric stereo systems.

Low delay modulated filter bank

본 문서는 변조되고 서브-샘플링된 디지털 필터 뱅크들뿐만 아니라, 그와 같은 필터 뱅크들의 설계를 위한 방법들 및 시스템들에 관한 것이다. 특히, 본 문서는 저 지연 변조 디지털 필터 뱅크들의 개선을 위한 방법 및 장치를 제안한다. 상기 방법은 비대칭 저역 통과 프로토타입 필터의 변조 및 이 필터의 계수들을 최적화하기 위한 새로운 방법을 이용한다. 더욱이, 계수들(640)의 프로토타입 필터 길이 및 샘플들(319)의 시스템 지연을 이용하는 채널 필터 뱅크(64)에 대한 특정 설계가 제공된다. 상기 방법은 예를 들어 필터 뱅크를 스펙트럼 이퀄라이저로 이용할 때, 서브대역 신호들의 독자적인 변경들로부터 발생하는 에일리어싱으로 인한 아티팩트들을 실질적으로 감소시킨다. 상기 방법은 바람직하게도 표준 PC 또는 디지털 신호 프로세서(DSP)에서 운영되는 소프트웨어에서 구현되지만, 또한 주문형 칩에서 하드코딩될 수 있다. 상기 방법은 다양한 유형들의 디지털 이퀄라이저들, 적응형 필터들, 다중대역 압신기들 및 고주파 복원(HFR) 또는 파라메트릭 스테레오 시스템들에서 이용되는 필터 뱅크들을 조정하는 스펙트럼 포락선에 대한 개선들을 제공한다. This document relates to modulated and sub-sampled digital filter banks as well as methods and systems for designing such filter banks. In particular, this document proposes a method and apparatus for improvement of low delay modulation digital filter banks. The method uses a new method for modulating the asymmetric low-pass prototype filter and for optimizing the coefficients of this filter. Moreover, a specific design for the channel filter bank 64 utilizing the prototype filter length of the coefficients 640 and the system delay of the samples 319 is provided. The method substantially reduces artifacts due to aliasing resulting from unique modifications of subband signals, for example when using a filter bank as a spectrum equalizer. The method is preferably implemented in software running on a standard PC or a digital signal processor (DSP), but may also be hard coded on a custom chip. The method provides improvements for various types of digital equalizers, adaptive filters, multiband compressors, and spectral envelopes that adjust filter banks used in high frequency reconstruction (HFR) or parametric stereo systems.

Complex exponential modulated filter bank for high frequency reconstruction or parametric stereo

본 문서는 변조되고 서브-샘플링된 디지털 필터 뱅크들뿐만 아니라, 그와 같은 필터 뱅크들의 설계를 위한 방법들 및 시스템들에 관한 것이다. 특히, 본 문서는 저 지연 변조 디지털 필터 뱅크들의 개선을 위한 방법 및 장치를 제안한다. 상기 방법은 비대칭 저역 통과 프로토타입 필터의 변조 및 이 필터의 계수들을 최적화하기 위한 새로운 방법을 이용한다. 더욱이, 계수들(640)의 프로토타입 필터 길이 및 샘플들(319)의 시스템 지연을 이용하는 채널 필터 뱅크(64)에 대한 특정 설계가 제공된다. 상기 방법은 예를 들어 필터 뱅크를 스펙트럼 이퀄라이저로 이용할 때, 서브대역 신호들의 독자적인 변경들로부터 발생하는 에일리어싱으로 인한 아티팩트들을 실질적으로 감소시킨다. 상기 방법은 바람직하게도 표준 PC 또는 디지털 신호 프로세서(DSP)에서 운영되는 소프트웨어에서 구현되지만, 또한 주문형 칩에서 하드코딩될 수 있다. 상기 방법은 다양한 유형들의 디지털 이퀄라이저들, 적응형 필터들, 다중대역 압신기들 및 고주파 복원(HFR) 또는 파라메트릭 스테레오 시스템들에서 이용되는 필터 뱅크들을 조정하는 스펙트럼 포락선에 대한 개선들을 제공한다. This document relates to modulated and sub-sampled digital filter banks as well as methods and systems for designing such filter banks. In particular, this document proposes a method and apparatus for improvement of low delay modulation digital filter banks. The method uses a new method for modulating the asymmetric low-pass prototype filter and for optimizing the coefficients of this filter. Moreover, a specific design for the channel filter bank 64 utilizing the prototype filter length of the coefficients 640 and the system delay of the samples 319 is provided. The method substantially reduces artifacts due to aliasing resulting from unique modifications of subband signals, for example when using a filter bank as a spectrum equalizer. The method is preferably implemented in software running on a standard PC or a digital signal processor (DSP), but may also be hard coded on a custom chip. The method provides improvements for various types of digital equalizers, adaptive filters, multiband compressors, and spectral envelopes that adjust filter banks used in high frequency reconstruction (HFR) or parametric stereo systems.

Low delay modulated filter bank

본 문서는 변조되고 서브-샘플링된 디지털 필터 뱅크들뿐만 아니라, 그와 같은 필터 뱅크들의 설계를 위한 방법들 및 시스템들에 관한 것이다. 특히, 본 문서는 저 지연 변조 디지털 필터 뱅크들의 개선을 위한 방법 및 장치를 제안한다. 상기 방법은 비대칭 저역 통과 프로토타입 필터의 변조 및 이 필터의 계수들을 최적화하기 위한 새로운 방법을 이용한다. 더욱이, 계수들(640)의 프로토타입 필터 길이 및 샘플들(319)의 시스템 지연을 이용하는 채널 필터 뱅크(64)에 대한 특정 설계가 제공된다. 상기 방법은 예를 들어 필터 뱅크를 스펙트럼 이퀄라이저로 이용할 때, 서브대역 신호들의 독자적인 변경들로부터 발생하는 에일리어싱으로 인한 아티팩트들을 실질적으로 감소시킨다. 상기 방법은 바람직하게도 표준 PC 또는 디지털 신호 프로세서(DSP)에서 운영되는 소프트웨어에서 구현되지만, 또한 주문형 칩에서 하드코딩될 수 있다. 상기 방법은 다양한 유형들의 디지털 이퀄라이저들, 적응형 필터들, 다중대역 압신기들 및 고주파 복원(HFR) 또는 파라메트릭 스테레오 시스템들에서 이용되는 필터 뱅크들을 조정하는 스펙트럼 포락선에 대한 개선들을 제공한다.

Apparatus and methods for vector inductors

在此提供用于矢量电感器的装置和方法。在特定配置中，一种装置，包括：矢量电感器，其包括布置在堆叠中并且通过电介质彼此分离的多个导体。所述导体彼此紧密耦合，以提供相对高量的互感。例如，堆叠中的相邻导体可以通过至少0.5或更具体地0.9或更大的耦合系数k互耦。在特定实现方式中，导体彼此并联电连接，以提供具有低电阻的矢量电感器。然而，堆叠中的各导体之间的紧密耦合可以产生具有与所述堆叠中的单独导体的自感相似的总电感的矢量电感器。可以通过在堆叠中包括附加导体来增加矢量电感器的Q因数。

Filter device and wireless device using same

무선신호부의 소형화, 경량화, 고신뢰성을 가능케하는 고성능의 필터장치를 제공한다. 패키지와, 그 패키지 내에 수용되고, 중심주파수가 다른 대역을 가지는 적어도 2개의 필터소자와, 상기 필터소자에 공통으로 설치된 입력단자와 출력단자를 가진다.

Complex exponential modulated filter bank for high frequency reconstruction or parametric stereo

Filter device and dualband radio system in which the filter device is used

무선신호부의 소형·경량화 및 고신뢰성을 가능케하는 고성능의 필터장치를 제공한다. 패키지와, 그 패키지내에 수용되고, 다른 대역의 중심주파수를 가지는 적어도 2개의 필터소자와, 상기 필터소자에 공통으로 설치된 입력단자와 출력단자를 가진다. Provided is a high-performance filter device that enables the compactness, light weight, and high reliability of a wireless signal part. A package, at least two filter elements housed in the package and having a center frequency of a different band, and input terminals and output terminals commonly provided in the filter elements.

Low delay modulated filter bank

The document relates to modulated sub-sampled digital filter banks, as well as to methods and systems for the design of such filter banks. In particular, the present document proposes a method and apparatus for the improvement of low delay modulated digital filter banks. The method employs modulation of an asymmetric low-pass prototype filter. Further, a specific design for a 64 channel filter bank using a prototype filter length of 640 coefficients and a system delay of 319 samples is given. The method substantially reduces artifacts due to aliasing emerging from independent modifications of subband signals, for example when using a filter bank as a spectral equalizer. The method is preferably implemented in software, running on a standard PC or a digital signal processor (DSP), but can also be hardcoded on a custom chip. The method offers improvements for various types of digital equalizers, adaptive filters, multiband companders and spectral envelope adjusting filter banks used in high frequency reconstruction (HFR) or parametric stereo systems.

Complex exponential modulated filter bank for high frequency reconstruction or parametric stereo

本文件係有關調變式次取樣數位濾波器組，且係有關用來設計此種濾波器組之方法及系統。本文件尤其提出了一種用來改良低延遲調變式數位濾波器組之方法及裝置。該方法採用對非對稱低通原型濾波器之調變、以及將該濾波器的係數最佳化之一新方法。此外，提供了一種使用640係數之原型濾波器長度及319樣本之系統延遲的64通道濾波器組之特定設計。當諸如將一濾波器組用來作為一頻譜等化器時，該方法實質上減少了由於對各次頻帶信號的獨立修改發生的頻疊所產生之假像。最好是以在標準PC或數位信號處理器(DSP)上運行的軟體實施該方法，但是亦可將該方法硬編碼在一客製晶片中。該方法提供了對各種類型的數位等化器、適應性濾波器、多頻帶壓縮擴展器、以及調整被用於高頻重建(HFR)或參數立體聲系統的濾波器組的適應性包絡線之改良。

Filter arrangement and method for filtering a signal

A filter arrangement comprises a first impedance, a second impedance and a subtractor. The first impedance comprises a first connection connected to an input of the filter arrangement and has a first resonant frequency. The second impedance comprises a first connection likewise connected to the input of the filter arrangement and has a second resonant frequency which is higher than the first resonant frequency. The subtractor comprises a first input connected to a second connection of the first impedance, comprises a second input connected to a second connection of the second impedance, and comprises a first connection of the output connected to a first output of the filter arrangement.

Filter device and duplexer

제어용 회로를 생략할 수 있고, 저비용화, 소형화 및 저소비 전력화를 도모할 수 있는 필터장치를 제공한다. 제1 신호단자(5)와 제2 신호단자(6) 사이에 밴드 패스 필터(3)가 접속되어 있고, 밴드 패스 필터(3)에 병렬로 LC회로(8)가 접속되어 있으며, LC회로(8)는 밴드 패스 필터(3)의 통과 대역에 있어서 오픈이 되는 반공진 특성을 가지면서, LC회로(8)가 접속되어 있음으로 인해 LC회로(8)가 접속되어 있지 않은 경우에 비해, 밴드 패스 필터(3)의 통과 대역 외의 일부 주파수 대역에서의 감쇠량이 커지도록 LC회로(8)가 구성되어 있는 필터장치(9). A filter device capable of omitting a control circuit and capable of reducing cost, size, and power consumption can be provided. The band pass filter 3 is connected between the first signal terminal 5 and the second signal terminal 6 and the LC circuit 8 is connected to the band pass filter 3 in parallel and the LC circuit 8 8 has an anti-resonance characteristic that is open in the pass band of the band-pass filter 3, and the resonance frequency of the band 8 is lower than that of the case where the LC circuit 8 is not connected because the LC circuit 8 is connected. And the LC circuit (8) is configured so that the amount of attenuation in some frequency bands outside the pass band of the pass filter (3) is increased.

Crystal filter array

Damping element

FIELD: electricity. ^ SUBSTANCE: damping element comprises two bus sections (46, 48) and two conductor sections (50, 52), besides according bus section (46, 48) and conductor section (50, 52) are connected electrically in parallel, besides these bus sections (46, 48) are arranged in space at the distance parallel to each other, and conductor sections (50, 52) consist, accordingly, of material that is highly electrically conductive, and bus sections (46, 48) - from material, which is not so electrically conductive. ^ EFFECT: in DC rectifier with distributed intermediate voltage circuits high-frequency currents are considerably weakened, at the same time capacity of losses in intermediate voltage circuit does not increase significantly, therefore capacitors of DC rectifier with distributed intermediate voltage circuits relative to efficient current of intermediate voltage circuit of this DC rectifier should not be any longer design with high margin. ^ 6 cl, 7 dwg РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) 2 400 912 (13) C1 (51) МПК H02M 1/44 (2007.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ, ПАТЕНТАМ И ТОВАРНЫМ ЗНАКАМ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (21), (22) Заявка: 2009134172/09, 05.09.2007 (24) Дата начала отсчета срока действия патента: 05.09.2007 (72) Автор(ы): БАКРАН Марк-Маттиас (DE), ХОЛЬВЕК Андреас (DE) (45) Опубликовано: 27.09.2010 Бюл. № 27 2 4 0 0 9 1 2 (56) Список документов, цитированных в отчете о поиске: JP 2000197345 A, 14.07.2000. RU 2138914 C1, 27.09.1999. SU 1201975 A, 30.12.1985. (85) Дата перевода заявки PCT на национальную фазу: 14.09.2009 2 4 0 0 9 1 2 R U (87) Публикация PCT: WO 2008/098628 (21.08.2008) C 1 C 1 (86) Заявка PCT: EP 2007/059286 (05.09.2007) Адрес для переписки: 129090, Москва, ул.Б.Спасская, 25, стр.3, ООО "Юридическая фирма Городисский и Партнеры", пат.пов. А.В.Мицу, рег.№ 364 (54) ДЕМПФИРУЮЩИЙ ЭЛЕМЕНТ (57) Реферат: Изобретение относится к демпфирующему элементу. В соответствии с изобретением этот демпфирующий элемент ...

Band-pass filter

Filter apparatus and duplexer

提供一种能省略控制用电路、能谋求低成本化、小型化以及低消耗电力化的滤波器装置。在滤波器装置(9)中，在第1信号端子(5)与第2信号端子(6)间连接带通滤波器(3)，在带通滤波器(3)并联连接LC电路(8)，LC电路(8)具有在带通滤波器(3)的通过频带成为开路的反谐振特性，并且LC电路(8)构成为与未连接LC电路(8)的情况相比，通过连接LC电路(8)能使带通滤波器(3)的通过频带外的一部分频带中的衰减量变得更大。

Complex exponential modulated filter bank for high frequency reconstruction

Complex exponential modulated filter bank for high frequency reconstruction or parametric stereo

본 문서는 변조되고 서브-샘플링된 디지털 필터 뱅크들뿐만 아니라, 그와 같은 필터 뱅크들의 설계를 위한 방법들 및 시스템들에 관한 것이다. 특히, 본 문서는 저 지연 변조 디지털 필터 뱅크들의 개선을 위한 방법 및 장치를 제안한다. 상기 방법은 비대칭 저역 통과 프로토타입 필터의 변조 및 이 필터의 계수들을 최적화하기 위한 새로운 방법을 이용한다. 더욱이, 계수들(640)의 프로토타입 필터 길이 및 샘플들(319)의 시스템 지연을 이용하는 채널 필터 뱅크(64)에 대한 특정 설계가 제공된다. 상기 방법은 예를 들어 필터 뱅크를 스펙트럼 이퀄라이저로 이용할 때, 서브대역 신호들의 독자적인 변경들로부터 발생하는 에일리어싱으로 인한 아티팩트들을 실질적으로 감소시킨다. 상기 방법은 바람직하게도 표준 PC 또는 디지털 신호 프로세서(DSP)에서 운영되는 소프트웨어에서 구현되지만, 또한 주문형 칩에서 하드코딩될 수 있다. 상기 방법은 다양한 유형들의 디지털 이퀄라이저들, 적응형 필터들, 다중대역 압신기들 및 고주파 복원(HFR) 또는 파라메트릭 스테레오 시스템들에서 이용되는 필터 뱅크들을 조정하는 스펙트럼 포락선에 대한 개선들을 제공한다.

Reconfigurable filter

A reconfigurable filter includes a splitter for providing an input signal on a plurality of paths. A first path includes a first filter section that can be configured as either a tunable band pass filter with a shunt-connected fixed inductor or a tunable notch filter with a fixed inductor in parallel with a tunable varactor, either of which can be responsive to a control signal. A second path is an all pass section that provides an unfiltered signal. A combiner is provided for combining the first filtered signal with the unfiltered signal for producing a composite signal. The unfiltered signal can have its gain or phase modified in either or both the splitter or the combiner.

Low delay modulated filter bank

The document relates to modulated sub-sampled digital filter banks, as well as to methods and systems for the design of such filter banks. In particular, the present document proposes a method and apparatus for the improvement of low delay modulated digital filter banks. The method employs modulation of an asymmetric low-pass prototype filter. Further, a specific design for a 64 channel filter bank using a prototype filter length of 640 coefficients and a system delay of 319 samples is given. The method substantially reduces artifacts due to aliasing emerging from independent modifications of subband signals, for example when using a filter bank as a spectral equalizer. The method is preferably implemented in software, running on a standard PC or a digital signal processor (DSP), but can also be hardcoded on a custom chip. The method offers improvements for various types of digital equalizers, adaptive filters, multiband companders and spectral envelope adjusting filter banks used in high frequency reconstruction (HFR) or parametric stereo systems.

Complex exponential modulated filter bank for high frequency reconstruction or parametric stereo

本文件係有關調變式次取樣數位濾波器組，且係有關用來設計此種濾波器組之方法及系統。本文件尤其提出了一種用來改良低延遲調變式數位濾波器組之方法及裝置。該方法採用對非對稱低通原型濾波器之調變、以及將該濾波器的係數最佳化之一新方法。此外，提供了一種使用640係數之原型濾波器長度及319樣本之系統延遲的64通道濾波器組之特定設計。當諸如將一濾波器組用來作為一頻譜等化器時，該方法實質上減少了由於對各次頻帶信號的獨立修改發生的頻疊所產生之假像。最好是以在標準PC或數位信號處理器(DSP)上運行的軟體實施該方法，但是亦可將該方法硬編碼在一客製晶片中。該方法提供了對各種類型的數位等化器、適應性濾波器、多頻帶壓縮擴展器、以及調整被用於高頻重建(HFR)或參數立體聲系統的濾波器組的適應性包絡線之改良。

Differential filter topology with dielectric absorption cancellation for a data acquisition device

In one embodiment, a differential filter is configured using a differential operational amplifier (op-amp) with two feedback RC networks, each RC network coupled between a respective input and a respective output of the op-amp. Two capacitive elements may each provide mid-band positive feedback from a respective output of the op-amp to the midpoint of a respective corresponding resistive element, where each resistive element is coupled to a respective input of the op-amp. The mid-band positive feedback may operate to convert a first-order response of the filter to a second-order response. In one set of embodiments, dielectric absorption (DA) cancellation may be implemented with positive RC feedback from a divided version of a respective one of the op-amp outputs. For cascaded filters, DA cancellation may be implemented with positive RC feed-forward. Transistors coupled across the feedback RC networks may be used to disable the filter, decoupling the filter from other circuit components when the filter is not in use.

SYNTHESIS FILTER BANK

a invenção refere-se a bancos de filtro digital subamostrados, modulados, bem como a métodos e sistemas para o projeto de tais bancos de filtro. em particular, a presente invenção refere-se a um método e aparelho para melhoramento de bancos de filtro digital modulados de baixo retardo. o método emprega modulação de um filtro protótipo passa-baixo assimétrico, e um novo método para otimizar os coeficientes deste filtro. além disto, é fornecido um projeto específico para um banco de filtro de 64 canais utilizando um comprimento de filtro protótipo de 640 coeficientes e um retardo de sistema de 319 amostras. o método reduz substancialmente artefatos devido a aliasing que emerge de modificações independentes de sinais de sub-banda, por exemplo ao utilizar um banco de filtro como um equalizador espectral. o método é preferivelmente implementado em software que opera em um pc padrão ou em um processador de sinal digital (dsp), porém também pode ser codificado em um chip cliente. o método oferece melhoramentos para diversos tipos de equalizadores digitais, filtros adaptáveis, compansores multibanda, e bancos de filtro de ajustamento de envoltória espectral utilizados em reconstrução de alta frequência (hfr) ou sistemas estéreo paramétricos. the invention relates to modulated, sub-sampled digital filter banks as well as methods and systems for the design of such filter banks. in particular, the present invention relates to a method and apparatus for improving low-delay modulated digital filterbanks. the method employs modulation of an asymmetric low-pass prototype filter, and a new method to optimize the coefficients of this filter. in addition, a specific design for a 64-channel filterbank is provided using a prototype filter length of 640 coefficients and a system delay of 319 samples. the method substantially reduces artifacts due to aliasing that emerge from independent modifications of subband signals, for example when using a filter bank as a spectral equalizer. the ...

ELECTRIC-Acoustic and Acoustic-Electric Transducers for Surface Wave Devices.

Surface-acoustic-wave frequency-selective matrix

FIELD: radio engineering; radio communications and radar engineering; frequency synthesizers, retunable receivers and transmitters, etc. SUBSTANCE: matrix has piezoelectric acoustic line, two groups of filters forming matrix in frequency range and placed in acoustic line, input and output splitters, m + n channel switches, and switch control device; group of line filters is made in the form of m-channel multiple-resonance (comb- type} interdigital transducers; group of column filters may be made in the form of n-channel multiple-resonance (comb-type) interdigital transducers. Novelty is that two groups of filters are arranged on acoustic line in parallel, in different acoustic channels, and intercoupled through multistrip coupler. EFFECT: improved frequency and electric characteristics. 2 dwg

Low delay modulated filter bank

The document relates to modulated sub-sampled digital filter banks, as well as to methods and systems for the design of such filter banks. In particular, the present document proposes a method and apparatus for the improvement of low delay modulated digital filter banks. The method employs modulation of an asymmetric low-pass prototype filter and a new method for optimizing the coefficients of this filter. Further, a specific design for a 64 channel filter bank using a prototype filter length of 640 coefficients and a system delay of 319 samples is given. The method substantially reduces artifacts due to aliasing emerging from independent modifications of subband signals, for example when using a filter bank as a spectral equalizer. The method is preferably implemented in software, running on a standard PC or a digital signal processor (DSP), but can also be hardcoded on a custom chip. The method offers improvements for various types of digital equalizers, adaptive filters, multiband companders and spectral envelope adjusting filter banks used in high frequency reconstruction (HFR) or parametric stereo systems.

Apparatus and method for improving channel filter selectivity and performance using voltage variable impedance elements

A controllable filter arrangement with a voltage controlled device that subjects a signal to a predetermined impedance as part of the filtering process when the voltage controlled device is in an active state. In an inactive state, the voltage controlled device may subject the signal to an impedance that prevents all frequencies of the signal from passing. This configuration may advantageously increase frequency selectivity and reduce insertion loss, size, cost, and tuning complexity when compared with conventional filter designs.

Band-pass filter

본 발명은 상당히 큰 통과 대역폭을 가지며, 동시에, 저지 대역에 상당히 경사진 에지를 가지며, 통과 대역에서 감쇠가 적은 대역 통과 필터에 관한 것이다. 대역 통과 필터는 세개의 병렬 LC 엘리멘트(L P 1,C P 1; L P 2,C P 2; L P 3,C P 3)를 포함하며, 그 중 하나는 대역 통과 필터의 입력(IN)과 대역 통과 필터의 출력(OUT)에 배치되고 다른 두개는 각각 고정된 기준 전위(P)중 하나에 접속된다.

Variable band surface acoustic wave filter

(57)【要約】本公報は電子出願前の出願データであるた め要約のデータは記録されません。

Hearing apparatus with an adaptive filter and method for filtering an audio signal

Eine Aufgabe der vorliegenden Erfindung besteht darin, bei einer Hörvorrichtung, die ein Audiosignal mittels eines adaptiven Filters verarbeitet, einen effizienten Betrieb zu ermöglichen. Die erfindungsgemäße Hörvorrichtung (10) umfasst eine Transformationseinrichtung (14) erster Stufe und zumindest zwei Transformationseinrichtungen (16) zweiter Stufe, wobei jede Transformationseinrichtung (16) zwer Kanäle erster Stufe durch Transformieren auf Subkanäle des Kanals aufzuteilen. Eine Filtereinrichtung (18) in jedem Kanal, der eine Transformationseinrichtung (16) zweiter Stufe aufweist, filtert das Signal des Kanals in Abhängigkeit von zu den Subkanälen jeweils ermittelten Gewichtungsfaktoren. Die Filtereinrichtung (18) sind dabei dazu ausgelegt, untereinander Gewichtungsfaktoren auszutauschen, so dass nur einige der Gewichtungsfaktoren tatsächlich berechnet werden müssen. An object of the present invention is to enable efficient operation in a hearing apparatus that processes an audio signal by means of an adaptive filter. The hearing device (10) according to the invention comprises a first-stage transformation means (14) and at least two second-stage transformation means (16), each transform means (16) dividing first-stage channels by transforming to subchannels of the channel. A filter device (18) in each channel, which has a second-stage transformation device (16), filters the signal of the channel as a function of weighting factors respectively determined for the sub-channels. The filter device (18) are designed to exchange weighting factors among one another, so that only some of the weighting factors actually have to be calculated.

Filter device and duplexer

Provided is a filter device that allows a control circuit to be removed and enables reductions in cost, size, and power consumption. A filter device (9) includes a band pass filter (3) connected between a first signal terminal (5) and a second signal terminal (6) and an LC circuit (8) connected in parallel with the band pass filter (3). The LC circuit (8) is configured to have anti-resonant characteristics that make the LC circuit (8) be open at a pass band of the band pass filter (3), and configured to make attenuation in a specified frequency band outside of the pass band of the band pass filter (3) higher than in a case in which the LC circuit (8) is not connected, as a result of the LC circuit (8) being connected.

Complex exponential modulated filter bank for high frequency reconstruction or parametric stereo

本文件係有關調變式次取樣數位濾波器組，且係有關用來設計此種濾波器組之方法及系統。本文件尤其提出了一種用來改良低延遲調變式數位濾波器組之方法及裝置。該方法採用對非對稱低通原型濾波器之調變、以及將該濾波器的係數最佳化之一新方法。此外，提供了一種使用640係數之原型濾波器長度及319樣本之系統延遲的64通道濾波器組之特定設計。當諸如將一濾波器組用來作為一頻譜等化器時，該方法實質上減少了由於對各次頻帶信號的獨立修改發生的頻疊所產生之假像。最好是以在標準PC或數位信號處理器(DSP)上運行的軟體實施該方法，但是亦可將該方法硬編碼在一客製晶片中。該方法提供了對各種類型的數位等化器、適應性濾波器、多頻帶壓縮擴展器、以及調整被用於高頻重建(HFR)或參數立體聲系統的濾波器組的適應性包絡線之改良。

A filter that minimizes in-band noise and maximizes detection sensitivity of exponentially-modulated signals

The trans-filter compresses in band AWGN, demodulates input signals and has no threshold due to applied noise. Two frequency selective networks with opposite amplitude vs frequency slopes are designed to remain 180 degrees out of phase over the signal band. Output amplitudes are equal at band center and are summed producing a monotonic amplitude vs frequency characteristic going thru zero at center frequency with abrupt phase reversal. This produces the parabolic output noise density and differentiates applied signals. Absence of nonlinear circuit components and product devices prevents generation of noise x noise products, avoiding the threshold phenomenon. Exponentially modulated digital signals produce output impulses due to the slope and abrupt phase reversal. The impulses have strong fundamental frequency components and may be recovered at baseband without frequency conversion. Cascading trans-filters increases noise reduction and impulse amplitude. The trans-filter algorithm may be used separately or in conjunction with one or more hardware trans-filters.

Complex exponential modulated filter bank for high frequency reconstruction or parametric stereo

본 문서는 변조되고 서브-샘플링된 디지털 필터 뱅크들뿐만 아니라, 그와 같은 필터 뱅크들의 설계를 위한 방법들 및 시스템들에 관한 것이다. 특히, 본 문서는 저 지연 변조 디지털 필터 뱅크들의 개선을 위한 방법 및 장치를 제안한다. 상기 방법은 비대칭 저역 통과 프로토타입 필터의 변조 및 이 필터의 계수들을 최적화하기 위한 새로운 방법을 이용한다. 더욱이, 계수들(640)의 프로토타입 필터 길이 및 샘플들(319)의 시스템 지연을 이용하는 채널 필터 뱅크(64)에 대한 특정 설계가 제공된다. 상기 방법은 예를 들어 필터 뱅크를 스펙트럼 이퀄라이저로 이용할 때, 서브대역 신호들의 독자적인 변경들로부터 발생하는 에일리어싱으로 인한 아티팩트들을 실질적으로 감소시킨다. 상기 방법은 바람직하게도 표준 PC 또는 디지털 신호 프로세서(DSP)에서 운영되는 소프트웨어에서 구현되지만, 또한 주문형 칩에서 하드코딩될 수 있다. 상기 방법은 다양한 유형들의 디지털 이퀄라이저들, 적응형 필터들, 다중대역 압신기들 및 고주파 복원(HFR) 또는 파라메트릭 스테레오 시스템들에서 이용되는 필터 뱅크들을 조정하는 스펙트럼 포락선에 대한 개선들을 제공한다.

Low delay modulated filter bank

The document relates to modulated sub-sampled digital filter banks, as well as to methods and systems for the design of such filter banks. In particular, the present document proposes a method and apparatus for the improvement of low delay modulated digital filter banks. The method employs modulation of an asymmetric low-pass prototype filter. Further, a specific design for a 64 channel filter bank using a prototype filter length of 640 coefficients and a system delay of 319 samples is given. The method substantially reduces artifacts due to aliasing emerging from independent modifications of subband signals, for example when using a filter bank as a spectral equalizer. The method is preferably implemented in software, running on a standard PC or a digital signal processor (DSP), but can also be hardcoded on a custom chip. The method offers improvements for various types of digital equalizers, adaptive filters, multiband companders and spectral envelope adjusting filter banks used in high frequency reconstruction (HFR) or parametric stereo systems.

Band-pass filter

The invention relates to a band-pass filter which has a pass band with a comparatively large pass-band width while at the same time presenting comparatively steep sides leading towards the stop-band and little damping in the pass band. The band-pass filter comprises three parallel LC members (LP1, CP1; LP2, CP2; LP3, CP3) one of which is positioned between a band-pass filter inlet (IN) and a band-pass filter outlet (OUT) while the other two are connected with one of their connectors to a fixed reference potential (P).

Complex exponential modulated filter bank for high frequency reconstruction

Complex-valued synthesis filter bank with phase shift

본 문서는 변조되고 서브-샘플링된 디지털 필터 뱅크들뿐만 아니라, 그와 같은 필터 뱅크들의 설계를 위한 방법들 및 시스템들에 관한 것이다. 특히, 본 문서는 저 지연 변조 디지털 필터 뱅크들의 개선을 위한 방법 및 장치를 제안한다. 상기 방법은 비대칭 저역 통과 프로토타입 필터의 변조 및 이 필터의 계수들을 최적화하기 위한 새로운 방법을 이용한다. 더욱이, 계수들(640)의 프로토타입 필터 길이 및 샘플들(319)의 시스템 지연을 이용하는 채널 필터 뱅크(64)에 대한 특정 설계가 제공된다. 상기 방법은 예를 들어 필터 뱅크를 스펙트럼 이퀄라이저로 이용할 때, 서브대역 신호들의 독자적인 변경들로부터 발생하는 에일리어싱으로 인한 아티팩트들을 실질적으로 감소시킨다. 상기 방법은 바람직하게도 표준 PC 또는 디지털 신호 프로세서(DSP)에서 운영되는 소프트웨어에서 구현되지만, 또한 주문형 칩에서 하드코딩될 수 있다. 상기 방법은 다양한 유형들의 디지털 이퀄라이저들, 적응형 필터들, 다중대역 압신기들 및 고주파 복원(HFR) 또는 파라메트릭 스테레오 시스템들에서 이용되는 필터 뱅크들을 조정하는 스펙트럼 포락선에 대한 개선들을 제공한다. This document relates to modulated and sub-sampled digital filter banks as well as methods and systems for designing such filter banks. In particular, this document proposes a method and apparatus for improvement of low delay modulation digital filter banks. The method uses a new method for modulating the asymmetric low-pass prototype filter and for optimizing the coefficients of this filter. Moreover, a specific design for the channel filter bank 64 utilizing the prototype filter length of the coefficients 640 and the system delay of the samples 319 is provided. The method substantially reduces artifacts due to aliasing resulting from unique modifications of subband signals, for example when using a filter bank as a spectrum equalizer. The method is preferably implemented in software running on a standard PC or a digital signal processor (DSP), but may also be hard coded on a custom chip. The method provides improvements for various types of digital equalizers, adaptive filters, multiband compressors, and spectral envelopes that adjust filter banks used in high frequency reconstruction (HFR) or parametric stereo systems.

Filter device and duplexer

Provided is a filter device in which a control circuit can be omitted, enabling the cost, size and power consumption of the filter device to be reduced. The filter device (9) has a bandpass filter (3) connected between a first signal terminal (5) and a second signal terminal (6), and an LC circuit (8) connected in parallel to the bandpass filter (3). The LC circuit (8) has anti-resonance characteristics that are open in the passband of the bandpass filter (3), and the LC circuit (8) is configured in such a manner that an attenuation amount in part of the out-of-band frequency band of the bandpass filter (3) increases to a greater extent than if the LC circuit (8) was not connected, due to the fact that the LC circuit (8) is connected.

Process and temperature compensation of an acoustic wave filter via a processor, memory and capacitor bank

Patent JPH0582768B2

Vector inductor having multiple mutually coupled metalization layers providing high quality factor

An inductor component includes a plurality of conductive elements, each formed as an individual patch of conductive material, with the conductive elements arranged in a vertical stack and tightly coupled to one another. Dielectric is disposed between more adjacent conductive elements, the dielectric has a permittivity and is sufficiently thin so as to provide a mutual inductance factor of at least one-half or greater between adjacent ones of the conductive elements. The dielectric is typically thinner than the adjacent conductors.

Complex exponential modulated filter bank for high frequency reconstruction or parametric stereo

本文件係有關調變式次取樣數位濾波器組，且係有關用來設計此種濾波器組之方法及系統。本文件尤其提出了一種用來改良低延遲調變式數位濾波器組之方法及裝置。該方法採用對非對稱低通原型濾波器之調變、以及將該濾波器的係數最佳化之一新方法。此外，提供了一種使用640係數之原型濾波器長度及319樣本之系統延遲的64通道濾波器組之特定設計。當諸如將一濾波器組用來作為一頻譜等化器時，該方法實質上減少了由於對各次頻帶信號的獨立修改發生的頻疊所產生之假像。最好是以在標準PC或數位信號處理器(DSP)上運行的軟體實施該方法，但是亦可將該方法硬編碼在一客製晶片中。該方法提供了對各種類型的數位等化器、適應性濾波器、多頻帶壓縮擴展器、以及調整被用於高頻重建(HFR)或參數立體聲系統的濾波器組的適應性包絡線之改良。

Filter switching device and filter switching method

A filter switching device includes a first buffer amplifier, a first characteristic resistor with one terminal connected to the output of the first buffer amplifier, first and second filter circuits connected in parallel to the other terminal, the first filter circuit including a first relay and a first low-pass filter, the second filter circuit including a second relay and a second low-pass filter, a third filter circuit connected to the output of the first buffer amplifier, having a second buffer amplifier and a second characteristic resistor connected between the output of the second buffer amplifier and a third low-pass filter, and a multiplexer connected between the first, second, and third filter circuits and a third characteristic resistor selectively connecting the first, second, or third filter circuit to the third characteristic resistor.

signal processing apparatus to filter an audio signal

BANCO DE FILTRO MODULADO DE BAIXO RETARDO. A invenção refere-se a bancos de filtro digital subamostrados, modulados, bem como a métodos e sistemas para o projeto de tais bancos de filtro. Em particular, a presente invenção refere-se a um método e aparelho para melhoramento de bancos de filtro digital modulados de baixo retardo. O método emprega modulação de um filtro protótipo passa-baixo assimétrico, e um novo método para otimizar os coeficientes deste filtro. Além disto, é fornecido um projeto específico para um banco de filtro de 64 canais utilizando um comprimento de filtro protótipo de 640 coeficientes e um retardo de sistema de 319 amostras. O método reduz substancialmente artefatos devido a aliasing que emerge de modificações independentes de sinais de sub-banda, por exemplo ao utilizar um banco de filtro como um equalizador espectral. O método é preferivelmente implementado em software que opera em um PC padrão ou em um processador de sinal digital (DSP), porém também pode ser codificado em um chip cliente. O método oferece melhoramentos para diversos tipos de equalizadores digitais, filtros adaptáveis, compansores multibanda, e bancos de filtro de ajustamento de envoltória espectral utilizados em reconstrução de alta frequência (HFR) ou sistemas estéreo paramétricos. LOW DELAY MODULATED FILTER BANK. The invention relates to sub-sampled, modulated digital filter banks, as well as methods and systems for designing such filter banks. In particular, the present invention relates to a method and apparatus for improving low-delay modulated digital filterbanks. The method employs modulation of an asymmetric low-pass prototype filter, and a new method to optimize the coefficients of this filter. In addition, a specific design for a 64-channel filterbank is provided using a prototype filter length of 640 coefficients and a system delay of 319 samples. The method substantially reduces artifacts due to aliasing that emerge from independent modifications of subband ...

Traction power converter's damping unit for electrical locomotive, has two rail pieces and two conductor pieces, where rail pieces are arranged in parallel such that rail pieces are spatially distant from each other

The damping unit has two rail pieces (46, 48) and two conductor pieces (50, 52), which are switched in an electrically parallel manner. The rail pieces are arranged in parallel such that the rail pieces are spatially distant from each other. The conductor pieces are composed of electrically sound conductive material e.g. copper, and the rail pieces are composed of electrically sound non conductive material e.g. stainless steel. Strip conductors are provided as the conductor pieces. The conductor pieces have connecting pieces (54-60) at their ends.

Low delay modulated filter bank

본 문서는 변조되고 서브-샘플링된 디지털 필터 뱅크들뿐만 아니라, 그와 같은 필터 뱅크들의 설계를 위한 방법들 및 시스템들에 관한 것이다. 특히, 본 문서는 저 지연 변조 디지털 필터 뱅크들의 개선을 위한 방법 및 장치를 제안한다. 상기 방법은 비대칭 저역 통과 프로토타입 필터의 변조 및 이 필터의 계수들을 최적화하기 위한 새로운 방법을 이용한다. 더욱이, 계수들(640)의 프로토타입 필터 길이 및 샘플들(319)의 시스템 지연을 이용하는 채널 필터 뱅크(64)에 대한 특정 설계가 제공된다. 상기 방법은 예를 들어 필터 뱅크를 스펙트럼 이퀄라이저로 이용할 때, 서브대역 신호들의 독자적인 변경들로부터 발생하는 에일리어싱으로 인한 아티팩트들을 실질적으로 감소시킨다. 상기 방법은 바람직하게도 표준 PC 또는 디지털 신호 프로세서(DSP)에서 운영되는 소프트웨어에서 구현되지만, 또한 주문형 칩에서 하드코딩될 수 있다. 상기 방법은 다양한 유형들의 디지털 이퀄라이저들, 적응형 필터들, 다중대역 압신기들 및 고주파 복원(HFR) 또는 파라메트릭 스테레오 시스템들에서 이용되는 필터 뱅크들을 조정하는 스펙트럼 포락선에 대한 개선들을 제공한다. This document relates to modulated and sub-sampled digital filter banks as well as methods and systems for designing such filter banks. In particular, this document proposes a method and apparatus for improvement of low delay modulation digital filter banks. The method uses a new method for modulating the asymmetric low-pass prototype filter and for optimizing the coefficients of this filter. Moreover, a specific design for the channel filter bank 64 utilizing the prototype filter length of the coefficients 640 and the system delay of the samples 319 is provided. The method substantially reduces artifacts due to aliasing resulting from unique modifications of subband signals, for example when using a filter bank as a spectrum equalizer. The method is preferably implemented in software running on a standard PC or a digital signal processor (DSP), but may also be hard coded on a custom chip. The method provides improvements for various types of digital equalizers, adaptive filters, multiband compressors, and spectral envelopes that adjust filter banks used in high frequency reconstruction (HFR) or parametric stereo systems.

Low delay modulation filter bank

Low delay modulated filter bank

本文涉及调制的子采样数字滤波器组以及用于设计这样的滤波器组的方法和系统。具体而言，本文提出一种用于改进低延迟调制数字滤波器组的方法和装置。该方法运用不对称低通原型滤波器的调制和用于优化这一滤波器的系数的新方法。另外给出用于(64)通道滤波器组的具体设计，该滤波器组使用(640个)系数的原型滤波器长度和(319个)样本的系统延迟。该方法例如在使用滤波器组作为谱均衡器时明显减少由于子频带信号的独立修改而出现的混叠所致的非自然因素。该方法优选地用在标准PC或者数字信号滤波器(DSP)上运行的软件来实施、但是也可以硬编码于定制芯片上。该方法赋予针对在高频重建(HFR)或者参数立体声系统中使用的各类数字均衡器、自适应滤波器、多频带压缩扩展器和谱包络调节滤波器的改进。

Apparatus and method for improving channel filter selectivity and performance using voltage variable impedance elements

A controllable filter arrangement with a voltage controlled device that subjects a signal to a predetermined impedance as part of the filtering process when the voltage controlled device is in an active state. In an inactive state, the voltage controlled device may subject the signal to an impedance that prevents all frequencies of the signal from passing. This configuration may advantageously increase frequency selectivity and reduce insertion loss, size, cost, and tuning complexity when compared with conventional filter designs.

Frequency coded sensors incorporating tapers

A surface acoustic wave device includes a piezoelectric substrate on which is formed a transducer that generates acoustic waves on the surface of the substrate from electrical waves received by the transducer. The waves are carried along an acoustic track to either a second transducer or a reflector. The transducers or transducer and reflector are formed of subsections that are constructed to operate at mutually different frequencies. The subsections of at least one of the transducers or transducer and reflector are out of alignment with respect to one another relative to the transverse of the propagation direction. The out of aligned subsections provide not only a frequency component but also a time to the signal output signal. Frequency response characteristics are improved. An alternative embodiment provides that the transducers and/or reflectors are continuously tapered instead of having discrete frequency subsections.

Crystal filter assembly

FILTER SEAT

a invenção refere-se a bancos de filtro digital subamostrados, modulados, bem como a métodos e sistemas para o projeto de tais bancos de filtro. em particular, a presente invenção refere-se a um método e aparelho para melhoramento de bancos de filtro digital modulados de baixo retardo. o método emprega modulação de um filtro protótipo passa-baixo assimétrico, e um novo método para otimizar os coeficientes deste filtro. além disto, é fornecido um projeto específico para um banco de filtro de 64 canais utilizando um comprimento de filtro protótipo de 640 coeficientes e um retardo de sistema de 319 amostras. o método reduz substancialmente artefatos devido a aliasing que emerge de modificações independentes de sinais de sub-banda, por exemplo ao utilizar um banco de filtro como um equalizador espectral. o método é preferivelmente implementado em software que era em um pc padrão ou em um processador de sinal digital (dsp), porém também pode ser codificado em um chip cliente. o método oferece melhoramentos para diversos tipos de equalizadores digitais, filtros adaptáveis, compansores multibanda, e bancos de filtro de ajustamento de envoltória espectral utilizados em reconstrução de alta frequência (hfr) ou sistemas estéreo paramétricos. the invention relates to modulated, sub-sampled digital filter banks as well as methods and systems for the design of such filter banks. in particular, the present invention relates to a method and apparatus for improving low-delay modulated digital filterbanks. the method employs modulation of an asymmetric low-pass prototype filter, and a new method to optimize the coefficients of this filter. in addition, a specific design for a 64-channel filterbank is provided using a prototype filter length of 640 coefficients and a system delay of 319 samples. the method substantially reduces artifacts due to aliasing that emerge from independent modifications of subband signals, for example when using a filter bank as a spectral equalizer. the ...

Waveform Design for QAM-FBMC Systems Considering Time Domain Localization

QAM-FBMC 시스템에서의 효율적인 필터를 설계를 위한 기준 및 다중 경로 페이딩 채널 환경에 적합한 필터 및 그 설계 방법이 제시된다. 본 발명에서 제안하는 필터뱅크 기반 다중 반송파 시스템에서 시간 영역의 지역성을 고려한 필터의 설계 방법은 복수의 부반송파들 각각에서 필터에 의해 주파수 이동이 적용된 필터를 펄스형성필터로 적용하고, 수신 필터링을 통해 각 필터들이 매칭되며, 전체 펄스 형태를 정의하는 단계, 복수의 부반송파들에서 총 간섭파워를 계산하여 정규화된 값에 대한 QAM-FBMC 전송신호의 self-SIR을 정의하는 단계, 필터의 이산시간 푸리에변환(DTFT)에 의해 QAM-FBMC 전송신호의 전력 분포 밀도(PSD)를 결정하고, 필터 계수와 필터의 DTFT의 폴-오프 레이트(fall-off rate)의 관계를 필터의 연속성의 미분가능성에 의해 결정하는 단계, 필터의 탭과 폴-오프 레이트를 통해 주파수 영역에서의 지역화를 수행하고 정규화된 시간과 정규화된 에너지를 이용하여 시간영역에서의 지역화를 수행하는 단계를 포함한다. A filter and its design method suitable for reference and multipath fading channel environment for efficient filter design in QAM-FBMC system are presented. In the filter bank-based multi-carrier system proposed in the present invention, the filter design method considering the localization of the time domain applies a filter applying a frequency shift to each of a plurality of subcarriers as a pulse forming filter, Filters are matched, defining the total pulse shape, calculating the total interference power in a plurality of subcarriers to define a self-SIR of the QAM-FBMC transmission signal for the normalized value, a discrete-time Fourier transform The power distribution density PSD of the QAM-FBMC transmission signal is determined by DTFT and the relationship between the filter coefficient and the fall-off rate of the DTFT of the filter is determined by the differentiability of the continuity of the filter Perform the localization in the frequency domain through the steps of the filter, the tap and the pole-off rate, and use the normalized time and the normalized energy in the time domain And a step of performing a screen.

Apparatus and methods for vector inductors

Apparatus and methods for vector inductors are provided herein. In certain configurations, an apparatus includes a vector inductor comprising a plurality of conductors arranged in a stack and separated from one another by dielectric. The conductors are tightly coupled to one another to provide a relatively high amount of mutual inductance. For example, adjacent conductors in the stack can be mutually coupled with a coupling coefficient k that is at least 0.5, or more particularly, 0.9 or greater. In certain implementations, the conductors are electrically connected in parallel with one another to provide the vector inductor with low resistance. However, tight coupling between the conductors in the stack can result in vector inductor having an overall inductance that is similar to that of a self- inductance of an individual conductor in the stack. The Q-factor of the vector inductor can be increased by the inclusion of additional conductors in the stack.

Complex exponential modulated filter bank for high frequency reconstruction or parametric stereo

Signal processing devices and methods filter and process an audio signal. A signal processing device includes a high frequency reconstructor or a parametric stereo processor that generates modified complex-valued subband sample; and a synthesis filter bank that receives the modified complex-valued subband samples and generates time domain output audio samples. The analysis filter bank comprises analysis filters (h k(n)) and the synthesis filter bank comprises synthesis filters (f k(n)) that are complex exponential modulated versions of a prototype filter (p0(n)) that has a length N. The analysis filter bank and synthesis filter bank have a system delay of D samples, wherein D is smaller than N. This structure can provide a reduced overall delay.

低延迟调制滤波器组

本申请涉及一种低延迟调制滤波器组。本文提出的用于改进低延迟调制数字滤波器组的方法运用不对称低通原型滤波器的调制和用于优化这一滤波器的系数的新方法。另外给出用于(64)通道滤波器组的具体设计，该滤波器组使用(640个)系数的原型滤波器长度和(319个)样本的系统延迟。该方法例如在使用滤波器组作为谱均衡器时明显减少由于子频带信号的独立修改而出现的混叠所致的非自然因素。该方法优选地用在标准PC或者数字信号滤波器(DSP)上运行的软件来实施、但是也可以硬编码于定制芯片上。该方法赋予针对在高频重建(HFR)或者参数立体声系统中使用的各类数字均衡器、自适应滤波器、多频带压缩扩展器和谱包络调节滤波器的改进。

Digital filterbank for spectral envelope adjustment

An apparatus and method are disclosed for processing an audio signal. The apparatus includes an input interface, a digital filterbank having an analysis part and a synthesis part, a first phase shifter, a spectral envelope adjuster, a second phase shifter, and an output interface. The first phase shifter and the second phase shifter reduce a complexity of the digital filterbank, which includes both analysis and synthesis filters that are complex-exponential modulated versions of a prototype filter.

一种对信号进行处理的方法及装置

本发明提供一种对信号进行处理的方法及装置，用以解决现有技术中在过渡带相对整个带宽占比很低的系统中，采用现有FIR滤波器将会造成频谱利用率低，资源开销大，设计复杂的问题。本发明实施例进行滤波器设计，将需要原始信号进行正交分解，并根据正交分解的层数和正交分解后原始信号的边缘高频带宽，生成FIR滤波器，采用FIR滤波器对所述原始信号的边缘高频信号进行滤波，将滤波后得到的信号和低频信号通过正交滤波器组后进行信号合成处理。由于本发明对信号采取逐级分解，分解过后的高频信号的带宽相对整个原始信号变窄，而过渡带的带宽固定不变，生成的FIR滤波器的阶数降低，并且计算量大大减少，使资源开销小，设计过程更为简便。

신호 처리를 위한 방법 및 장치

본 발명은 신호 처리를 위한 방법 및 장치를 제공하여 천이 대액폭이 전체 대역폭의 작은 비율을 차지하는 시스템에서 종래의 FIR필터가 사용될 때 스펙트럼 이용률이 낮아지고, 많은 양의 자원이 필요하며, 설계가 복잡하는 종래 기술의 문제점을 해결한다. 본 발명의 실시예에 따른 필터 설계에서, 원래 입력 신호를 직교 하고 직교 분해 계층 수 및직교 분해 후의 원래 입력 신호의 에지 고주파 대역폭에 따라 FIR 필터를 생성하고, FIR필터를 사용하여 상기 원래 입력 신호의 에지 고주파 신호를 필터링하고, 필터링을 통해 획득된 신호 및 저주파 신호를 직교 필터에 입력한 후 신호를 결합한다. 본 발명에서 신호가 계층별로 분해되고, 분해를 통해 획득된 고주파 신호의 대역폭은 원래 입력 신호의 대역폭보다 좁고, 천이 대역의 대역폭은 원래대로 유지되고 생성된 FIR필터의 차수가 저감되며 계산량이 줄어들고 적은 양의 리소스를 필요로 하며 설계 프로세스가 더 단순하게 된다.

신호 처리를 위한 방법 및 장치

본 발명은 신호 처리를 위한 방법 및 장치를 제공하여 천이 대액폭이 전체 대역폭의 작은 비율을 차지하는 시스템에서 종래의 FIR필터가 사용될 때 스펙트럼 이용률이 낮아지고, 많은 양의 자원이 필요하며, 설계가 복잡하는 종래 기술의 문제점을 해결한다. 본 발명의 실시예에 따른 필터 설계에서, 원래 입력 신호를 직교 하고 직교 분해 계층 수 및직교 분해 후의 원래 입력 신호의 에지 고주파 대역폭에 따라 FIR 필터를 생성하고, FIR필터를 사용하여 상기 원래 입력 신호의 에지 고주파 신호를 필터링하고, 필터링을 통해 획득된 신호 및 저주파 신호를 직교 필터에 입력한 후 신호를 결합한다. 본 발명에서 신호가 계층별로 분해되고, 분해를 통해 획득된 고주파 신호의 대역폭은 원래 입력 신호의 대역폭보다 좁고, 천이 대역의 대역폭은 원래대로 유지되고 생성된 FIR필터의 차수가 저감되며 계산량이 줄어들고 적은 양의 리소스를 필요로 하며 설계 프로세스가 더 단순하게 된다.

一种对信号进行处理的方法及装置

一种对信号进行处理的方法及装置，将需要输入的原始信号进行逐级正交分解，根据正交分解的层数和正交分解后原始信号的边缘高频带宽，生成有限长度单位冲击响应FIR滤波器，采用FIR滤波器对原始信号的边缘高频信号进行滤波，将滤波后得到的信号以及进行逐级正交分解后每一级得到的低频信号通过正交滤波器组后进行信号合成处理。

Ultra-wideband tunable filters based on multi-resolution band-selection

Devices and methods for tunable RF filtering. Multiple bimodal filter stages are used within a filter device to provide for tunable frequency response of the filter device. The use of M sequential bimodal filter stages, each having different frequency resolutions, may allow for 2 M possible modes of operation.

Time-division interleaving bandpass filter for voice activity detection

Time-division interleaving bandpass filter for voice activity detection

The present invention relates to a time division interleaving band-pass filter for use in voice activity detection, which operates at different central frequencies in respective intervals of a predetermined period of time. The band-pass filter circuitry includes multiple band-pass filtering channels sharing a common transistor circuit, bias circuit and current mirror circuit. The multiple band-pass filtering channels operate in a time division interleaving manner, which enables the sharing of the common set of band-pass filter circuitry components. Thus, the present invention allows a reduced chip area as the area does not increase proportionally with the number of filtering channels. The invention also mitigates the influence of transistor fabrication variations on the filter's central frequencies. Moreover, pulse durations t i are additionally introduced to the determination of the central frequencies, dispensing with the need for matching of current mirror circuits and transistors and resulting in higher accuracy of the band-pass filter's central frequencies. As a result, more band-pass filtering channels with different central frequencies can be included for a given frequency range.

一种用于语音活动检测的时分交织带通滤波器

一种用于语音活动检测的时分交织带通滤波器，通过在滤波器电路中，一个预定的时间段里的不同的时间间隙实现不同中心频率的带通滤波器，达到多组带通滤波通道共用同一个晶体管电路、偏置电路和电流镜像电路的目的。由于多组带通滤波通道以时分交织的方式运行，只需要一组带通滤波器的电路，因此节省了芯片面积，芯片面积和滤波器通道数目增加不是正比关系，降低晶体管制造工艺对滤波器中心频率的影响。同时在确定中心频率时，引入了脉冲时间t i，不需要电流镜像电路和晶体管匹配，提高带通滤波器组的中心频率的准确度，从而使得可以在一个特定的频率范围内加入更多的不同中心频率的带通滤波器。

一种用于语音活动检测的时分交织带通滤波器

本发明涉及一种用于语音活动检测的时分交织带通滤波器，通过在滤波器电路中，一个预定的时间段里的不同的时间间隙实现不同中心频率的带通滤波器，达到多组带通滤波通道共用同一个晶体管电路、偏置电路和电流镜像电路的目的。由于多组带通滤波通道以时分交织的方式运行，只需要一组带通滤波器的电路，本发明节省了芯片面积，芯片面积和滤波器通道数目增加不是正比关系，降低晶体管制造工艺对滤波器中心频率的影响。同时在确定中心频率时，引入了脉冲时间t i ，不需要电流镜像电路和晶体管匹配，提高带通滤波器组的中心频率的准确度，从而使得可以在一个特定的频率范围内加入更多的不同中心频率的带通滤波器。

Time division interleaving band-pass filter for use in voice activity detection

In one aspect, a time division interleaving band-pass filter can be used in voice activity detection, which operates at different central frequencies in respective intervals of a predetermined period of time. The band-pass filter circuitry includes multiple band-pass filtering channels sharing a common transistor circuit, bias circuit and current mirror circuit. The multiple band-pass filtering channels operate in a time division interleaving manner, which enables the sharing of the common set of band-pass filter circuitry components. Thus, the present invention allows a reduced chip area as the area does not increase proportionally with the number of filtering channels. The invention also mitigates the influence of transistor fabrication variations on the filter's central frequencies. Moreover, pulse durations ti are additionally introduced to the determination of the central frequencies, dispensing with the need for matching of current mirror circuits and transistors and resulting in higher accuracy of the band-pass filter's central frequencies.

信号処理のための方法および装置

滤波器装置和在其中使用该滤波器装置的双频段无线系统

一种滤波器装置包括设置在一个封装组件中的至少两个滤波器元件(21、22)，每个滤波器元件仅通过在预定频段内的信号，滤波器元件的预定频段具有彼此不同的中心频率(f 1 、f 2 )。一个输入端(T1)连接到滤波器元件的各自的输入端和由它们共用，以及一个输出端连接到滤波器元件的各自输出端和由它们共用。

필터뱅크 기반 다중 반송파 시스템에서 시간 영역의 지역성을 고려한 필터 디자인

QAM-FBMC 시스템에서의 효율적인 필터를 설계를 위한 기준 및 다중 경로 페이딩 채널 환경에 적합한 필터 및 그 설계 방법이 제시된다. 본 발명에서 제안하는 필터뱅크 기반 다중 반송파 시스템에서 시간 영역의 지역성을 고려한 필터의 설계 방법은 복수의 부반송파들 각각에서 필터에 의해 주파수 이동이 적용된 필터를 펄스형성필터로 적용하고, 수신 필터링을 통해 각 필터들이 매칭되며, 전체 펄스 형태를 정의하는 단계, 복수의 부반송파들에서 총 간섭파워를 계산하여 정규화된 값에 대한 QAM-FBMC 전송신호의 self-SIR을 정의하는 단계, 필터의 이산시간 푸리에변환(DTFT)에 의해 QAM-FBMC 전송신호의 전력 분포 밀도(PSD)를 결정하고, 필터 계수와 필터의 DTFT의 폴-오프 레이트(fall-off rate)의 관계를 필터의 연속성의 미분가능성에 의해 결정하는 단계, 필터의 탭과 폴-오프 레이트를 통해 주파수 영역에서의 지역화를 수행하고 정규화된 시간과 정규화된 에너지를 이용하여 시간영역에서의 지역화를 수행하는 단계를 포함한다.