ЦИФРОВОЙ ПРИЕМНИК ГАРМОНИЧЕСКИХ СОСТАВЛЯЮЩИХ ДЕЛЬТА-МОДУЛИРОВАННЫХ СИГНАЛОВ

Использование: в электросвязи. Сущность изобретения: цифровой приемник содержит блок синхронизации 1, блок памяти 2, два элемента ИСКЛЮЧАЮЩЕЕ ИЛИ с инверсией 3,4, два реверсивных счетчика 5,6, блоки ИСКЛЮЧАЮЩЕЕ ИЛИ с инверсией 8, компаратор 9, сумматор 10, коммутатор 11, пороговый блок 12, умножитель 13. 1 з. п. ф-лы, 6 ил.

МНОГОЧАСТОТНЫЙ ПРИЕМНИК ДЕЛЬТА-МОДУЛИРОВАННЫХ СИГНАЛОВ

Многочастотный приемник дельта-модулированных сигналов относится к технике цифровой обработки сигналов и может быть использован в электросвязи, например в телефонной связи для приема многочастотных кодов ("два из шести", "два из восьми" и т.д.), преобразованных в цифровую форму с помощью дельта-модуляции. Технико-экономическая эффективность предлагаемого устройства обеспечивается его упрощением за счет устранения элементов "исключающее ИЛИ" из состава корреляторов. Это достигается путем введения связи между выходом элемента ИЛИ и одним из адресных входов блока памяти, а также соединением входа разрешения счета каждого коррелятора с объединенными входами разрешения счета соответствующих реверсивных и управляющих счетчиков.

Вызывное устройство

Изобретение относится к телефонии . Цель изобретения - упрощение устройства путем сокращения количества буферных усилителей. Устройство содержит блок 1 формирования огибающей посылки вызова, блок 2 управления (БУ), электроакустический преобразователь 3, токоограничивающие элементы 4 и 5. БУ 2 содержит счетчик 6 посылок вызова, тональный генератор 7, три элемента И 9-11, два буферных усилителя 12 и 13. Вновь введен элемент ИСКПЮЧАОДЕЕ ИЛИ-НЕ 8. При реализации БУ 2 в интегральном исполнении его надежность определяется площадью кристаллов (ПК), на которых реализована схема, и числом внешних выводов микросхем, каждый из которых соединен с кристаллом внутри корпуса микросхемы. Поскольку основную часть ПК занимают буферные усилители 12 и 13, то уменьшение их числа по сравнению с прототипом приводит к уменьшению ПК, а следовательно , к повышению надежности БУ 2 и О) всего устройства. 1 ил.

Формирователь сигналов управленияАВТОМАТичЕСКОй ТЕлЕфОННОй СТАНции

Schaltungsanordnung zur Vermeidung von Rufstromstoerungen durch Kabelentladungen

DIGITALER TON-DEKODER

SIGNALISIERUNGSEMPFAENGER.

To extract signal frequencies transmitted on a telephone line (a,b) the signal input (E) is connected first to an attenuator (DG). A high pass filter (HP) on the attenuator output side is connected to a control pulse input (TL). The filter output is extended to a signal evaluator and converter (SE) whose output, in turn, is passed to a band-pass filter (BP). A band width changing circuit (BU), also controlled by the pulse input (TL), is connected to the band pass (BP) and the attenuator (DG). The threshold frequency and the band centre frequency of both filters (HP, BP) is set by the control pulse (TL) to the desired value by setting the appropriate pulse frequency. The threshold frequency is lower than the band centre frequency.

Programmable digital call progress tone detector

Improvements in or relating to impulse responding circuits

... 526,501. Valve relays. ASSOCIATED ELECTRIC LABORATORIES, Inc. March 17, 1939, No. 8636. Convention date, March 19, 1938. [Class 40 (v)] An impulse responding circuit includes a relay in the anode circuit of a valve so biased about the lower bend of the anode current grid voltage characteristic that the relay winding normally carries current but means are provided to ensure its release when no alternating current impulses are being received. The received signals are repeated by a relay energized by a condenser discharge so that the repeated signals are of constant duration. The relay 22 is normally held in the de-energized condition by current flowing from +B over 23, 22 and 28 to -B. When a signal is received current also flows in opposition to this from +B through valve 15, relay 22 and 26 to -B and the armature 29 moves to make contact 31. Condenser 32, which has been charging over 35, 36, is discharged through relay 14 and this relay energizes to close contacts 13 and repeat the signal ...

Improvements in or relating to electric signal transmission systems

... 793,544. Voice-frequency receivers. PHILIPS ELECTRICAL INDUSTRIES, Ltd. May 9, 1955 [May 12, 1954], No. 13341/55. Class 40 (4). [Also in Group XL (c)] In a transmission system using V.F. signalling wherein a pilot current of the same frequency as the V.F. signals is continuously transmitted and an alarm is given if its level falls below a predetermined minimum, an amplifier for both signalling and pilot currents has its output coupled to its input through a path which includes both a circuit tuned to a frequency preferably above the signalling frequency and means whereby the feedback may be made positive, to produce oscillations, or negative, according to whether the level of the V.F. and pilot current is below or above the predetermined minimum. Coupling circuit 11 between the output 9 and the grid circuit 8 of valve 6 includes rectifiers 14, 15 and the nature of the feedback is determined by the relative potential between points 21 and 22, the potential at point 21 being determined by ...

TELEPHONE NETWORK WITH SWITCHING PLANTS, WHICH ARE OVER FEEDER LINES WITH ONE ANOTHER EN BUNDEN, IN PARTICULAR BRANCH NET WITH A MAIN PLANT, WHICH IS OVER EXTENSION LINE LINES WITH WAEHLUNTERANLAGEN GROUP

FERNSPRECHNETZ MIT VERMITTLUNGSANLAGEN, DIE UEBER VERBINDUNGSLEITUNGEN MITEINANDER VERBUNDEN SIND, INSBESONDERE NEBENSTELLENNETZ MIT EINER HAUPTANLAGE, DIE UEBER NEBENANSCHLUSSLEITUNGEN MIT WAEHLUNTERANLAGEN VERBUNDEN IST

TELEPHONE NETWORK WITH SWITCHING PLANTS, WHICH ARE OVER FEEDER LINES WITH ONE ANOTHER EN BUNDEN, IN PARTICULAR BRANCH NET WITH A MAIN PLANT, WHICH IS OVER EXTENSION LINE LINES WITH WAEHLUNTERANLAGEN GROUP

TELEPHONE NETWORK WITH SWITCHING PLANTS, WHICH ARE OVER FEEDER LINES WITH ONE ANOTHER EN BUNDEN, IN PARTICULAR BRANCH NET WITH A MAIN PLANT, WHICH IS OVER EXTENSION LINE LINES WITH SELECTING DOCUMENTS GROUPS

BLOCKING CIRCUIT FOR THE PREVENTION OF DISTURBING TELEPHONE LINE SIGNALS

CLAY/TONE CALL FREQUENCY REGULATION DEVICE AND - PROCEDURES

Circuit and method for detecting a tone signal

INTERLOCK CIRCUIT FOR PREVENTING CORRUPTION OF TELEPHONE LINE SIGNALS

EMPLOYING CUSTOMER PREMISES EQUIPMENT IN COMMUNICATIONS NETWORK MAINTENANCE

The present invention customizes a network connection to customer premises equipment using a calibration signal. A network signal processor emits a tag signal indicating that a signal processing plafform is in use. Customer premises equipment (CPE) issues a calibration signal to the network signal processor based on detection of the tag signal. The customer premises equipment outputs the calibration signal to the network signal processor which measures the signal loss, adjusts the gain mapping and issues a calibration signal to the customer premises equipment. The customer premises equipment then estimates spectral shaping based on the calibration signal from the network signal processor and equalizes the receive path so that the signal processing platform is detected and implemented. Embodiments of the present invention are illustrative of a more general concept of the use of CPE as an agent in telephone network maintenance.

EMPLOYING CUSTOMER PREMISES EQUIPMENT IN COMMUNICATIONS NETWORK MAINTENANCE

The present invention customizes a network connection to customer premises equipment using a calibration signal. A network signal processor emits a tag signal indicating that a signal processing plafform is in use. Customer premises equipment (CPE) issues a calibration signal to the network signal processor based on detection of the tag signal. The customer premises equipment outputs the calibration signal to the network signal processor whi ch measures the signal loss, adjusts the gain mapping and issues a calibration signal to the customer premises equipment. The customer premises equipment then estimates spectral shaping based on the calibration signal fr om the network signal processor and equalizes the receive path so that the sign al processing platform is detected and implemented. Embodiments of the present invention are illustrative of a more general concept of the use of CPE as an agent in telephone network maintenance.

Schaltungsanordnung zur Übertragung von Stromstössen in Fernsprechanlagen.

Elektrische Anordnung mit einer Gasentladungsröhre.

Schaltungsanordnung zur Signalgabe mittels Wechselstrom beliebiger Frequenz

Schaltungsanordnung für den Empfang eines aus einem Wechselstromimpuls bestehenden Schaltkennzeichens, insbesondere für Fernsprechanlagen, Fernsteueranlagen und dergleichen.

Schaltungsanordnung zur Signalgabe mittels Wechselstrom beliebiger Frequenz

Schaltungsanordnung zur Umsetzung von Wählzeichen

Signalisierungseinrichtung in einer elektrischen Fernmeldeanlage.

Schaltungsanordnung in Fernsprechanlagen mit Impulssteuerung über abgeriegelte Leitungen

Signalübermittlungsanlage

Method for a switching signal system for handling the connection traffic in telephone networks, in particular extension networks with dial-up secondary system traffic

Method for a switching signal system to handle the connection traffic in telephone networks, in particular in PBX networks with dial-up secondary system traffic

Method for a switching signal system to handle connection traffic in telephone networks, in particular in PBX networks with dial-up sub-system traffic

Method for exchanging switching signals in the connection traffic in telephone networks

Method for exchanging switching signals in the connection traffic in telephone networks

Method for exchanging switching signals in connection traffic between telephone exchanges in telephone networks, in particular in telephone PABX networks

Multiplex transmission device

Improvements with the devices of retransmission of currents of indication

Receiver of electromagnetic signals

PULSE CORRECTING SINGLE FREQUENCY SIGNALING RECEIVER

METHOD AND APPARATUS FOR PERFORMING SPECTRAL PROCESSING IN TONE DETECTION

A general purpose network tone detection method and apparatus that allows the precise and accurate recognition of North American tones (MF, DTMF (Dual-Tone Multifrequency), and CPT (Call Progress Tones)) and international MF-R2 tones as well as taking into consideration other common tones such as Calling Card Service Prompt and Recall Dial. Through the use of the Discrete Fourier Transform (DFT) on small time windows and by providing phase continuity between these windows, the results of the successive DFTs may be combined and processed by a second DFT computation. This second DFT allows higher frequency resolution without requiring the re-computation of the DFT from the time samples. The resulting effect is a tone receiver with both high time and frequency resolution which consequently leads to robust and accurate tone recognition systems conforming even to the most stringent specification while maintaining low computational requirements.

TONE AND PROBE SET FOR NON-INTRUSIVELY IDENTIFYING PAIRS IN A TELECOMMUNICATIONS NETWORK

A tone and probe set for tracing telecommunications lines is provided. The set comprises a tone generator and transmitter unit (10) for generating and transmitting a tone at one end (14) of a telecommunications line (P1), and a receiver unit (12) that can be used at the other end (16) of the telecommunications line (P1) for detecting the generated tone. Significantly, the tone is of a sufficiently high frequency that any services being carried by the telecommunications line (P1) will not be affected, and of a sufficiently high amplitude to allow detection by the receiver unit (12), so as to provide non-intrusive tracing of the telecommunications line (P1).

Employing customer premises equipment in communications network maintenance

The present invention customizes a network connection to customer premises equipment using a calibration signal. A network signal processor emits a tag signal indicating that a signal processing platform is in use. Customer premises equipment (CPE) issues a calibration signal to the network signal processor based on detection of the tag signal. The customer premises equipment outputs the calibration signal to the network signal processor which measures the signal loss, adjusts the gain mapping and issues a calibration signal to the customer premises equipment. The customer premises equipment then estimates spectral shaping based on the calibration signal from the network signal processor and equalizes the receive path so that the signal processing platform is detected and implemented. Embodiments of the present invention are illustrative of a more general concept of the use of CPE as an agent in telephone network maintenance.

A method and apparatus for detecting reception of a tone signal

Tone detection may be accomplished by receiving an in-phase signal component 203 and a quadrature signal component 204. These components are then sampled to produce a plurality of sampled in-phase signal components 207 and a plurality of sampled quadrature signal components 208. The sampled in-phase signal components 207, or the sampled quadrature signal components 208, are then shifted by a pre-determined phase angle to produce a plurality of shifted components. Having shifted these signals, the shifted signals, or at least a set of them, are compared with the opposite non-shifted sampled signals, or a set thereof. When each of the shifted signal components substantially match the opposite non-shifted signal components, a tone signal is being received. ...

TONE SIGNAL MEASURING CIRCUIT

PURPOSE: To decrease the effect of the jitters of a tone signal by making a frequency changing point into a reference for a frequency measuring time, preventing a part near the changing point of the tone signal from being measured, and averaging the signal by means of the counted value of the input signal. CONSTITUTION: A gate signal generator 1 controls the gates of counters 4 and 5 to compare an input signal at every cycle. A counter 2 measures how many cycles of the input signals 11 are inputted in the counting period of a counter 6. The time to measure the tone signal is decided with the changing point of the frequencies as the reference, the measurement of the tone signal is started when the tone signal is stabilized from the changing point of the frequencies, and the signal is measured up to the next changing point of the tone frequencies. Further a function to cancel the jitters of the input frequencies is added to a circuit to search for the frequency changing point. In addition ...

УСТРОЙСТВО ДЛЯ ПРИЕМА МНОГОЧАСТОТНЫХ СИГНАЛОВ

Изобретение относится к электросвязи, в частности к автоматическим средствам приема сигналов телефонной сигнализации, и может быть использовано в системах передачи дискретной информации. Предложено устройство, содержащее блок согласования с каналом связи (1), фильтр низких частот (2), аналого-цифровой преобразователь (3), режекторный фильтр (4), линейный детектор (5), интегрирующее звено (6), первый - четвертый пороговые элементы (7), (17), (21), (23), блок согласованных фильтров (8.1-8.6), блок линейных детекторов (9.1-9.6), блок интегрирующих звеньев (10.1-10.6), блок управляемых ключей (11.1-11.6), управляющий таймер (12), арифметический блок (13), первый - третий сумматоры (14), (15), (20), первый и второй блоки вычисления отношения (16), (22), инвертор (18), блок временной задержки (19), логический элемент И (24), блок отображения (25). Данное устройство обеспечивает устойчивое выделение полезного сигнала из смеси канальных шумов и паразитных речевых сигналов с помощью частотной селекции ...

Цифровой многочастотный приемник сигналов адаптивной дельта-модуляции

Изобретение относится к радиосвязи. Цель изобретения - упрощение устройства. Приемник содержит блок 1 синхронизации, оперативные запоминающие устройства 2 и 3, эл-т ИЛИ 4, постоянное запоминающее устройство 5 и корреляторы 6, каждый из которых состоит из эл-та ИСКЛЮЧАЮЩЕЕ ИЛИ 7, реверсивного счетчика 8, двоичного счетчика 9, решающего блока 10 и дешифратора 11. В приемнике осуществляется чередование режимов записи и считывания в устройства 2 и 3, управляемые блоком 1 синхронизации. В режиме считывания адресация соответствующего устройства 2 и 3 происходит с удвоенной частотой. Выходные сигналы устройств 2 и 3 объединяются в эл-те ИЛИ 4, поэтому считывание сигнала на корреляторы 6 производится непрерывно. К концу каждого цикла обработки на выходах корреляторов 6 появляется достоверная информация о наличии или отсутствии каких-либо гармонических составляющих сигнала входной цифровой последовательности. 2 ил.

Evaluating message codes transmitted over two wire system - using single timing circuit with reset control and interconnection by digital logic circuit

Transmission of data is carried out by employing a.c message identifying codes in advance of the transmitted data. The timing of the individual signals (tx) is generated in a resettable timer (ZG) which resets after the end of every pulse train. The timer and the incoming (E) and outgoing (S) messages are interconnected in a digital logic circuit (LVS). The proposed arrangement eliminates the need for individual time generators and monitors for the mark and space divisions of the identifying codes. It also generates the reqd. codes for messages to be transmitted. The installation also comprises a coupler (LS) for connection to the two wire transmission system and a control unit or processor (ST). The latter supervises and orders the operation of the logic unit (LVS) according to a preset programme.

Schaltungsanordnung fuer Wechselstromuebertragungen

Schaltungsanordnung zur Signalgabe mittels Wechselstrom beliebiger Frequenz

A keying circuit

... 887,782. Automatic exchange systems ; voicefrequency signalling. NIPPON ELECTRIC CO. Ltd. Jan. 15, 1960 [Jan. 20, 1959], No. 1497/60. Class 40 (4). [Also in Group XL (b)] A keying arrangement for a transmission circuit, having A.C. input terminals D, E and A.C. output terminals 13 between which a controllable insertion loss circuit is inserted, comprises a transformer 27 having one winding 28 connected to the transmission circuit, two varistors 22 and 23 connected with like polarities to the opposite ends of another winding 26 of the transformer 27, and a D.C. circuit for the control of bias applied to the varistors, in which the direct current and the alternating currents flow in separate circuits, the bias control circuit comprising a D.C. supply 19 and a chain of three resistors 16, 17, and 18, one end of the chain being connected to ground and to one pole of the D.C. supply, the junction-point A between the first and second resistors being connected to the other pole of the D.C. supply ...

Switching configuration for frequency-selective indication receivers in communications, in particular telephone systems

TELEPHONE NETWORK WITH SWITCHING PLANTS, WHICH ARE UEBER FEEDER LINES WITH ONE ANOTHER GROUP, IN PARTICULAR BRANCH NET WITH A MAIN PLANT, WHICH IS UEBER NEBENANSCHLUSSLEITUNGEN WITH SELECTING UNDER PLANTS GROUPS

TELEPHONE NETWORK WITH SWITCHING PLANTS, WHICH ARE OVER FEEDER LINES WITH ONE ANOTHER GROUP, IN PARTICULAR BRANCH NET WITH A MAIN PLANT, WHICH IS OVER NEBENANSCHLUSSLEITUNGEN WITH SELECTING UNDER PLANTS GROUPS

PARTICIPANT CONNECTION CIRCUIT WITH EARTH KEY ACTUATION INDICATION, HIGH IMPEDANCE OF ADJUSTABLE SUPPLY AND DEVICE FOR CALL SIGNAL GENERATION.

TELEPHONE NETWORK WITH SWITCHING PLANTS, WHICH ARE OVER FEEDER LINES WITH ONE ANOTHER GROUP, IN PARTICULAR BRANCH NET WITH A MAIN PLANT, WHICH IS OVER NEBENANSCHLUSSLEITUNGEN WITH SELECTING UNDER PLANTS GROUPS

TELEPHONE NETWORK WITH SWITCHING PLANTS, WHICH ARE OVER FEEDER LINES WITH ONE ANOTHER EN BUNDEN, IN PARTICULAR BRANCH NET WITH A MAIN PLANT, WHICH IS OVER EXTENSION LINE LINES WITH WAEHLUNTERANLAGEN GROUP

TELEPHONE NETWORK WITH SWITCHING PLANTS, WHICH ARE OVER FEEDER LINES WITH ONE ANOTHER GROUP, IN PARTICULAR BRANCH NET WITH A MAIN PLANT, WHICH IS OVER NEBENANSCHLUSSLEITUNGEN WITH SELECTING UNDER PLANTS GROUPS

TELEPHONE NETWORK WITH SWITCHING PLANTS, WHICH ARE OVER FEEDER LINES WITH ONE ANOTHER GROUP, IN PARTICULAR BRANCH NET WITH A MAIN PLANT, WHICH IS OVER NEBENANSCHLUSSLEITUNGEN WITH WAEHLUNTERANLAGEN GROUP

A SIGNAL DETECTING CIRCUIT FOR DETECTING A SIGNAL SPECIFIED IN A DESIGNATED FREQUENCY

Employing customer premises equipment in communications network maintenance

TONE DETECTION USING DISCRETE FOURIER TRANSFORM TECHNIQUES

Supervisory audio tone (SAT) in a receive signal in a wireless communicatio ns system is detected using a discrete Fourier transform (DFT) supplied with samples of a filtered and decimated signal derived from the receive signal. The DFT can comprise M 2-input butterfly computation stages for computing an N-point DFT where N = 2M. Each of the stages m from 1 to M-1 determines and stores, for each current sample at the input, at most 2m intermediate results forming only a subset of intermediate result s required for computation by the next stage. Each of up to 2m other intermediate results required for computation by the next stage is produced by shifting of a respective stored intermediate result of the respective subset determined in respect of an input sample preceding the current sample by 2M-m-1 samples. For example there are M = 5 stages for a 3 2- point DFT having 18 outputs, 6 outputs for each of three SAT frequencies. ...

PROCESS AND DEVICE TO DETECT the PRESENCE Of a PERIODIC SIGNAL OF KNOWN PERIOD

La présente invention propose un procédé et un dispositif pour détecter, parmi un ensemble de signaux, la présence d'un signal périodique de période d'apparition T, dans lequel on délivre un signal de discrimination dudit signal dans ledit ensemble de signaux. Selon l'invention, on échantillonne le signal de discrimination en In échantillons de signal sur plusieurs périodes T, une valeur d'état B(i) représentant son niveau, et on calcule une valeur réelle de corrélation SR, en cumulant pour chaque couple d'échantillons i, i+Z la valeur de corrélation instantanée entre la valeur d'état B(i) et la valeur d'état B(i+Z), les échantillons i et i+Z étant repérés à des instants décalés d'une période T. Puis, on mesure le taux r d'échantillons présentants ledit signal, sur le nombre total d'échantillons, on détermine au moins une valeur dite "moyenne théorique de corrélation", et on compare la valeur de corrélation réelle SR avec chaque valeur moyenne théorique de corrélation et on en déduit la présence ou l'absence du signal à détecter. The present invention proposes a method and a device for detecting, among a set of signals, the presence of a periodic signal of appearance period T, in which a signal for discriminating said signal in said set of signals is delivered. According to the invention, the discrimination signal is sampled in In signal samples over several periods T, a state value B (i) representing its level, and a real correlation value SR is calculated, by cumulating for each pair d 'samples i, i + Z the instantaneous correlation value between the state value B (i) and the state value B (i + Z), the samples i and i + Z being identified at instants shifted by' a period T. Then, the rate r of samples exhibiting said signal is measured, out of the total number of samples, at least one so-called "theoretical average correlation value" is determined, and the real correlation value SR is compared ...

Tone detector

The present invention provides a tone detector that is capable of performing accurate tone signal detection in a short period of time. Specifically, the tone detector according to the present invention includes: a control unit that measures the tone signals using a plurality of channels having a predetermined measuring time interval, which are shifted by a fixed time period, and reads out the tone signals stored in a memory unit for each of the measuring time intervals; detection processing units that determine the characteristic quantity of the tone signals read out by the control unit; and a tone determination unit that identifies the tone signal for each of the plurality of channels based on the characteristic quantity determined in the detection processing units. In this tone detector, the tone signals are measured using a plurality of channels wherein the measuring time interval of each channel is shifted by a fixed time period after which the tone signal is identified. Thus, the detection ...

Tactile communication method

A method and apparatus are disclosed for vibrating a telecommunications terminal that receives a call or message in accordance with a sequence of pulses that is based on one or more attributes of the associated incoming call or message. In particular, the illustrative embodiment varies at least one of: the number of pulses in the sequence, the durations of pulses, the intensity of pulses, and the tempo with which the sequence occurs. Attributes of the incoming call or message include who the caller is, a message priority, a message subject, and the location from which the call was placed. The present invention thus enables a telecommunications terminal in vibrate mode to impart information about the nature of an incoming call or message to the terminal's user without the user having to view the terminal's display.

МНОГОЧАСТОТНЫЙ ПРИЕМНИК ДЕЛЬТА-МОДУЛИРОВАННЫХ СИГНАЛОВ

Изобретение относится к технике цифровой обработки сигналов и может использоваться в электросвязи, например в телефонной связи для приема многочастотных кодов, преобразованных в цифровую форму с помощью дельта-модуляции. Технико-экономическая эффективность заявленного устройства по сравнению с прототипом заключается в его упрощении за счет обеспечения возможности устранения элементов Исключающее ИЛИ из состава корреляторов. Положительный эффект достигается путем введения связи между выходом элемента ИЛИ и одним из адресных входов блока памяти, а также соединением входа разрешения счета каждого коррелятора с объединенными входами разрешения счета соответствующих реверсивных и управляющих счетчиков. 5 ил., 1 табл.

Цифровой приемник сигналов многочастотного кода

Использование: прием сигналов многочастотного кода 2 из 6й. Сущность изобретения:.приемник содержит блок синхронизации 1, М согласованных фильтров 2, постоянно запоминающий блок 3 И элементов ИЛИ-НЕ 4, M пороговых блоков 5 блок 6 фиксации количества срабатываний, формирователь 7 импульсов, RS-триггер 8. Повышение помехозащищенности приемника- достигается за счет того, что срабатывание фиксируется только в тех двух частотных каналах, в которых уровень профильтрованного сигнала максимален. 6 ил.

Verfahren und Schaltungsanordnung zur Durchgabe von Anruf- und den jeweiligen Verbindungszustand kennzeichnenden Signalen zu Teilnehmerstellen in Fernmelde-, insbesondere Fernsprechanlagen

ÜBERTRAGUNGSSYSTEM MIT VERBESSERTER TONERKENNUNG

VERFAHREN FUER STOERIMPULSFESTE WECHSELSTROMRUFERKENNUNG IN FERNSPRECHVERMITTLUNGSANLAGEN

Schaltungsanordnung fuer Rufumsetzer mit UEbergang von zweidraehtiger auf vierdraehtige Niederfrequenzverbindung

LOOP STATUS VERIFICATION SYSTEM

A system is disclosed for verifying the integrity of each one of a number of communication paths, illustratively telephone subscriber loops, that runs between a near end location, illustratively a telephone company central office, and a corresponding remote ("far end") location(s). This system utilizes circuitry, such as a line verification module, that is located at the far end of each path to impart a selected test signal specifically a selected one of a number of sub-audible frequencies, thereto. In one embodiment, the circuitry continously transmits a test signal over the path. The level of the test signal is automatically adjusted such that this signal remains at an approximately constant amplitude regardless of whether that path is in an on-hook or off-hook condition. Central office monitoring circuitry is connected to the near end of every path being verified. For each such path, the monitoring circuitry first "learns" the frequency associated with the test signal appearing over ...

PULSE DETECTION APPARATUS

... 1390243 Pulse thresholding; telephone systems TELEFONAKTIEBOLAGET L M ERICSSON 12 May 1972 [17 May 1971] 22547/72 Headings H3T and H4K A pulse thresholding circuit, described as used in a narrow band signalling channel in a carrier telephone system, derives the threshold voltage for the leading edge from the differential of the received signal and for the trailing edge from the peak value of the signal. The pulse signal, which, as described, is in the form of an amplitude modulated carrier, is passed through a narrow band filter 10 and it is explained that the slope of the pulse edges is indicative of the pulse amplitude and an indication of the amplitude may therefore be obtained for thresholding the leading edge without the delay resulting from the conventional use of a peak detector. To this end the carrier is detected at 11 and passed at III to one input of a comparator 14 and via a differentiator 12 to the other input II. The peak output from the differentiator occurs at the half-amplitude ...

TRANSMITTING AND PROCESSING SWITCHING CHARACTERISTICS FOR CONNECTION TRAFFIC IN A TELEPHONE NETWORK

The AC audio-frequency signalling method with a large switching signal stock is used for the connection traffic between primary systems and dial-up secondary systems in telephone networks, the individual switching signals being composed of primary signals (HK1...HK4) and secondary signals (NK1...NK1''') and the primary signals (HK1...HK4) and secondary signals (NK1...NK1''') being able to be distinguished from one another by different frequencies and to have individually different lengths. The purpose of the method is to safeguard through-connection for a specific transmission direction when switching signals from different directions collide and interfere with one another. This is achieved through repetition of a secondary signal transmitted between two primary signals. ...

Improved system for registering a train of positive and negative half cycles of an alternating current

... 571,483. Selective signalling. WESTERN ELECTRIC CO., Inc. Sept. 10, 1943, No. 14875.. Convention date, Aug. 6, 1942. [Class 40 (i)] [Also in Group XL] The members of a chain of gas-filled discharge tubes respond to the successive half-cycles of an incoming signal. As shown, the incoming signal is amplified at L and passed direct to a transformer POS and through a phasereversing tube INV to a transformer NEG. The effect of this is that while the current is rising (second half of a negative half-cycle and first half of a positive half-cycle) an impulse tending to cause break-down is applied to the primary (left-hand) electrodes of all the odd-numbered tubes and an impulse tending to prevent breakdown is applied to the primary electrodes of the even-numbered tubes. The converse effect is produced while the current is falling. The rising part of the first positive half-cycle. breaks down tube 1, which has a normal bias over resistance A1, and the resulting discharge current biases tube 2 so ...

TELEPHONE NETWORK WITH SWITCHING PLANTS, WHICH ARE OVER FEEDER LINES WITH ONE ANOTHER GROUPS

Switching configuration for the transmission of current draws in telephone systems.

FERNSPRECHNETZ MIT VERMITTLUNGSANLAGEN, DIE UEBER VERBINDUNGSLEITUNGEN MITEINANDER VERBUNDEN SIND, INSBESONDERE NEBENSTELLENNETZ MIT EINER HAUPTANLAGE, DIE UEBER NEBENANSCHLUSSLEITUNGEN MIT WAEHLUNTERANLAGEN VERBUNDEN IST

TELEPHONE NETWORK WITH SWITCHING PLANTS, WHICH ARE OVER FEEDER LINES WITH ONE ANOTHER GROUPS

TELEPHONE NETWORK WITH SWITCHING PLANTS, THE OVER FEEDER LINES WITH ONE ANOTHER GROUPS ARE IN PARTICULAR BRANCH NET WITH A MAIN PLANT, WHICH IS OVER NEBENANSCHLUSSLEITUNGEN WITH WAEHLUNTERANLAGEN GROUP

TELEPHONE NETWORK WITH SWITCHING PLANTS, WHICH ARE OVER FEEDER LINES WITH ONE ANOTHER GROUP, IN PARTICULAR BRANCH NET WITH A MAIN PLANT, WHICH IS OVER NEBENANSCHLUSSLEITUNGEN WITH WAEHLUNTERANLAGEN GROUP

TELEPHONE NETWORK WITH SWITCHING PLANTS, WHICH ARE OVER FEEDER LINES WITH ONE ANOTHER GROUP, IN PARTICULAR BRANCH NET WITH A MAIN PLANT, WHICH IS OVER NEBENANSCHLUSSLEITUNGEN WITH WAEHLUNTERANLAGEN GROUP

DECREASE OF THE DISTURBANCE OF AN OUTPUT SIGNAL OF A MULTI-HAVEN LINK

FERNSPRECHNETZ MIT VERMITTLUNGSANLAGEN, DIE UEBER VERBINDUNGSLEITUNGEN MITEINANDER VERBUNDEN SIND

REMOTE SENSOR WITH INDUCTIVELY COUPLED POWER SUPPLY

GENERATEUR DE TONALITES POUR CENTRAUX TELEPHONIQUES A DIVISION DE TEMPS

GENERATEUR DE TONALITES POUR CENTRAUX TELEPHONIQUES A DIVISION DE TEMPS EN TECHNIQUE MIA, COMPRENANT UN OSCILLATEUR OSC, APTE A PRODUIRE UN SIGNAL DE FREQUENCE EGALE A CELLE DE LA TONALITE A ENVOYER AUX USAGERS, UN AMPLIFICATEUR OPERATIONNEL AO DONT LE SIGNAL DE SORTIE ATTAQUE LA BASE D'UN COUPLE DE TRANSISTORS COMPLEMENTAIRES TS ET TS. LES COLLECTEURS DES DEUX TRANSISTORS SONT RESPECTIVEMENT CONNECTES, AU MOYEN DES RESISTANCES R ET R, A DES SOURCES D'ALIMENTATION POSITIVE V ET NEGATIVE -V. LES EMETTEURS SONT CONNECTES AU CONDUCTEUR "CHAUD" DE LA VOIE PHONIQUE HW. ENTRE LES COLLECTEURS ET LE CONDUCTEUR "FROID" DE LA VOIE PHONIQUE SONT RESPECTIVEMENT CONNECTES DES CONDENSATEURS C ET C. LE CONDUCTEUR FROID EST EN OUTRE CONNECTE A LA MASSE PAR UNE RESISTANCE R.

GENERATOR OF TONALITIES FOR TELEPHONE CENTRES HAS DIVISION OF TIME

Устройство формирования вызывного сигнала

Изобретение относитс  к телефонии. Цель изобретени  - уменьшение коэф. нелинейных искажений при одновременном повышении стабильности уровн  выходного напр жени . Устройство содержит г-р 1 опорного напр жени , канал 24 основного регулировани , состо щий из г-ра 2 модулированного напр жени , амплитудного детектора 3, регулируемого преобразовател  13 напр жени , детектора 14 рассогласовани  и регул тора 15, коммутатор 4, блок управлени  5, нормализатор 6, блок выделени  7 модул , усилитель 8 рассогласовани , канал 25 коррекции, состо щий из регулируемого преобразовател  9 напр жени , детектора 10 рассогласовани , блока коррекции 11 и инвертора 12, формирователь 16, датчик 17 тока, блок защиты 18, фиксатор 19 и согласующий ключ 20. Входной сигнал, нормализованный и преобразованный в синусоидальное напр жение, усиливаетс  и поступает в каналы 24 и 25, работающие соответственно на выдачу энергии в нагрузку и на отбор энергии из нагрузки. Сигналы из каналов 24 и 25 поступают на управл емый коммутатор 4, преобразующий пульсирующее напр жение в переменное, которое далее через датчик 17 поступает на выход устройства. 1 ил. The invention relates to telephony. The purpose of the invention is to reduce the coefficient. nonlinear distortion while increasing the stability of the output voltage level. The device contains a rc 1 reference voltage, a main control channel 24, consisting of a rm 2 modulated voltage, an amplitude detector 3, an adjustable voltage converter 13, a discrepancy detector 14 and a regulator 15, a switch 4, a control unit 5 , normalizer 6, module allocation unit 7, error amplifier 8, correction channel 25 consisting of adjustable voltage converter 9, error detector 10, correction unit 11 and inverter 12, driver 16, current sensor 17, protection unit 18, latch 19 and according to conductive key 20. The input signal is normalized and converted into a sinusoidal voltage, amplified and fed into the channels 24 and 25, respectively, running on the issuing of energy ...

Anordnung fuer Wechselstromnummernwahl

Signal-Detektorschaltung zum Detektieren eines in einer bezeichneter Frequenz spezifizierten Signals.

Automatische Vermittlungseinrichtung fuer Fernmeldeanlagen

Improvements in or relating to telecommunication systems

... 966,973. Phase measurement. DE STAAT DER NEDERLANDEN, TEN DEZE VERTEGENWOORDIGD DOOR DE DIRECTEUR-GENERAAL DER POSTERIJEN,TELEGRAFIE EN TELEFONIE. Oct. 7, 1960 [Nov. 4, 1959], No. 34377/60. Heading G1U. [Also in Division H4] Apparatus determining the service class for connection between subscribers of an automatic telephone exchange,wherein the connection is classified by a marking voltage having a predetermined phase derived from an n-phase system, and in which from the n-phase system a p-phase system is derived in which p is proportional to n and the voltages of the p-phase system are phase shifted over a given angle with respect to the voltages of the n-phase system; the voltages of the p-phase system are directed in pairs to an impulse shaping network producing a pattern of n impulses whose interpulse phase shift is determined by the phase angle between the voltages of the p-phase system, and an impulse derived at the zero point of the marking voltage is compared for coincidence with ...

pROGRAMMABLE DIGITAL CALL PROGRESS TONE DETECTOR

FERNSPRECHNETZ MIT VERMITTLUNGSANLAGEN, DIE UEBER VERBINDUNGSLEITUNGEN MITEINANDER VERBUNDEN SIND, INSBESONDERE NEBENSTELLENNETZ MIT EINER HAUPTANLAGE, DIE UEBER NEBENANSCHLUSSLEITUNGEN MIT WAEHLUNTERANLAGEN VERBUNDEN IST

FERNSPRECHNETZ MIT VERMITTLUNGSANLAGEN, DIE UEBER VERBINDUNGSLEITUNGEN MITEINANDER VER- BUNDEN SIND, INSBESONDERE NEBENSTELLENNETZ MIT EINER HAUPTANLAGE, DIE UEBER NEBENANSCHLUSS- LEITUNGEN MIT WAEHLUNTERANLAGEN VERBUNDEN IST

TRANSMITTER AND RECEIVER AND IDENTIFICATION PATTERN TRANSMISSION METHOD AND IDENTIFICATION PATTERN DETECTION METHOD

A transmitter and an identification pattern transmission method thereof and a receiver and an identification pattern detection method thereof are provided. The transmitter includes a random sequence generator, a mapper and a resource allocation unit. The identification pattern transmission method includes following steps. A random sequence is generated. The random sequence is mapped to an identification pattern. The identification pattern is partitioned into a plurality of identification segments. The identification segments are allocated to a plurality of communication resource blocks to generate a transmitted signal having information of the identification pattern, where each of the communication resource blocks is spaced from another adjacent communication resource block by a predetermined number of symbols and/or a predetermined number of subcarriers. 1. A transmitter , adapted to transmit an identification pattern used for device-to-device communication , the transmitter comprising:a random sequence generator, generating a random sequence;a mapper, coupled to the random sequence generator, and mapping the random sequence to the identification pattern, wherein the identification pattern comprises a plurality of orthogonal frequency division multiplexing symbols on a plurality of subcarriers; anda resource allocation unit, coupled to the mapper, and partitioning the identification pattern into a plurality of identification segments, and allocating the identification segments to a plurality of communication resource blocks to generate a transmitted signal having information of the identification pattern, wherein each of the communication resource blocks is spaced from another adjacent communication resource block by a predetermined number of symbols and/or a predetermined number of subcarriers.2. The transmitter as claimed in claim 1 , wherein a number of the orthogonal frequency division multiplexing symbols in each of the identification segments is a positive ...

BULK TELEPHONY CONTROL SYSTEM SUBSCRIBER DATA MANIPULATION

A system for bulk telephony control system subscriber data manipulation, comprising an EMU server that receives a plurality of telephony control system subscriber data, analyzes at least a portion of the information, determines whether to modify at least a portion of the telephony control system subscriber data, the determination being based at least in part on the analysis, applies any determined modifications to at least a portion of the telephony control system subscriber data, and provides at least a portion of the information as output, and a method for bulk telephony control system subscriber data manipulation using an EMU server. 1. A system for bulk telephony control system subscriber data manipulation , comprising: receive a plurality of information via a network, at least a portion of the information comprising telephony control system subscriber data;', 'analyze at least a portion of the information;', 'determine whether to modify at least a portion of the telephony control system subscriber data, the determination being based at least in part on the analysis;', 'apply any determined modifications to at least a portion of the telephony control system subscriber data; and', 'provide at least a portion of the information as output; and, 'an extraction, manipulation, and update (EMU) server comprising at least a plurality of programming instructions stored in a memory and operating on a processor of a network-connected computing device and configured toa plurality of communication adapters, each comprising at least a plurality of programming instructions stored in a memory and operating on a processor of a network-connected computing device and configured to facilitate communication between the EMU server and a third-party system.2. The system of claim 1 , wherein the operation of the EMU server is directed based at least in part on configuration information received by the EMU server.3. The system of claim 2 , wherein at least a portion of the configuration ...

METHOD OF TRANSMITTING AND RECEIVING CONTROL INFORMATION IN A WIRELESS COMMUNICATION SYSTEM

A method of transmitting and receiving control information in a wireless communication system is disclosed. The method of receiving control information related to a specific point-to-multipoint service in a user equipment of a wireless communication system comprises receiving a notification message including indication information and an identifier identifying the point-to-multipoint service from a network, the indication information indicating at least one downlink channel related to the specific point-to-multipoint service among a plurality of downlink channels established for transmission of control information for at least one or more point-to-multipoint service, and receiving at least one downlink channel indicated by the indication information. 1. A method of receiving a signal associated with a broadcast or multicast service , the method comprising:receiving, by a device, a signal carrying a plurality of OFDM (Orthogonal Frequency Division Multiplexing) symbols in a time domain and a plurality of subcarriers in a frequency domain,wherein the plurality of OFDM (Orthogonal Frequency Division Multiplexing) symbols carry a frame including subframes,wherein a part of continuous OFDM symbols in the subframes is used for transmission of physical signal channel and a remaining part of continuous OFDM symbols in the subframes is used for transmission of a data channel in physical layer,wherein the subframes include Layer 1 (L1) information channel and Layer 2 (L2) information channel which are located at beginning parts of the subframes, andwherein the Layer 1 (L1) information channel includes identification information for uniquely identifying a data channel carrying the associated broadcast or multicast service, and allocation information on position of the associated broadcast or multicast service in a subframe,wherein the allocation information indicates address information of the data channel in a time or frequency-region.2. The method of claim 1 , wherein the ...

METHOD FOR TRANSMITTING AN UPLINK SIGNAL AND FEEDBACK INFORMATION, AND RELAY APPARATUS USING THE METHOD

The invention relates to a method of transmitting an uplink signal at a communication apparatus in a wireless communication system. The wireless communication system can receive pattern information of downlink subframes for a base station (BS)-to-the communication apparatus transmission as a bitmap; receive resource block (RB) information associated with a control channel for the BS-to-the communication apparatus transmission; receive the control channel from a fourth orthogonal frequency division multiplexing (OFDM) symbol of the downlink subframe n corresponding to a downlink subframe index n based on the RB information and the pattern information, the downlink subframe n comprising at least one downlink subframe other than downlink subframe 0, downlink subframe 4, downlink subframe 5 and downlink subframe 9; receive a data channel in the downlink subframe n; and transmit feedback information associated with the data channel to the BS via an uplink subframe for the communication apparatus-to-the BS transmission. 1. A method of transmitting an uplink signal at a communication apparatus in a wireless communication system , the method comprising:receiving pattern information of downlink subframes for a base station (BS)-to-the communication apparatus transmission as a bitmap;receiving resource block (RB) information associated with a control channel for the BS-to-the communication apparatus transmission;receiving the control channel from a fourth orthogonal frequency division multiplexing (OFDM) symbol of the downlink subframe n corresponding to a downlink subframe index n based on the RB information and the pattern information, the downlink subframe n comprising at least one downlink subframe other than downlink subframe 0, downlink subframe 4, downlink subframe 5 and downlink subframe 9;receiving a data channel in the downlink subframe n; andtransmitting feedback information associated with the data channel to the BS via an uplink subframe for the communication ...

METHODS AND SYSTEMS FOR COMMUNICATION IN DENSE WIRELESS ENVIRONMENTS

Systems, methods, and computer readable storage media communicate with a wireless device within a dense wireless environment. In one aspect, a method includes determining whether a wireless device is subject to interference, adjusting a transmission attribute based on the determining, and transmitting a message to the wireless device based on the adjusted transmission attribute. In some aspects, adjusting a transmission attribute may include selecting one or more of time division multiplexing or frequency division multiplexing when communicating with the wireless device. In some aspects, particular time periods and/or particular frequency bands may be selected for communication with the device depending on whether the device is subject to interference. 1. A method of transmitting a wireless message from a first wireless device to a second wireless device on a medium utilizing carrier sense multiple access (CSMA) , comprising:determining whether the second wireless device is subject to interference;associating the second wireless device with one of at least two sets of multiplexing parameters based on the determining;adjusting a transmission attribute based on the set of multiplexing parameters with which the second wireless device is associated; andtransmitting a message to the second wireless device based on the adjusted transmission attribute.2. The method of claim 1 , further comprising basing the determining of whether the second wireless device is subject to interference on one or more of a distance from the first wireless device to the second wireless device claim 1 , network statistics associated with communications between the first wireless device and second wireless device claim 1 , and a wireless link condition or topology between the first wireless device and the second wireless device.3. The method of claim 2 , further comprising basing the determining on one or more of: a packet error rate claim 2 , a transmit power of a message received from the ...

METHODS AND SYSTEMS FOR FREQUENCY MULTIPLEXED COMMUNICATION IN DENSE WIRELESS ENVIRONMENTS

Systems, methods, and devices for high-efficiency wireless frequency division multiplexing are provided. A method includes receiving, at a first wireless device, a reference signal from an associated access point, the reference signal indicative of a time of joint transmission with at least a second wireless device. The method further includes transmitting a first communication to the access point based on the reference signal, the communication utilizing a first subset of wireless frequencies available for use. The first communication is concurrent with a second communication, from the second wireless device, utilizing a second subset of wireless frequencies, the second subset excluding the first subset. 1. A method of high-efficiency wireless frequency division multiplexing , comprising:receiving, at a first wireless device, a reference signal from an associated access point, the reference signal indicative of a time of joint transmission with at least a second wireless device; andtransmitting a first communication to the access point based on the reference signal, the communication utilizing a first subset of wireless frequencies available for use,the first communication being concurrent with a second communication, from the second wireless device, utilizing a second subset of wireless frequencies, the second subset excluding the first subset.2. The method of claim 1 , further comprising transmitting the reference signal in response to reception of a ready-to-send (RTX) frame at the access point claim 1 , the reference signal comprising a ready-to-send (RTX) frame comprising one or more of: a frame control field claim 1 , a duration field claim 1 , a source address field claim 1 , a destination address field claim 1 , and an information payload comprising one or more of the following indications: a requested transmission time claim 1 , the size of the queues for transmission claim 1 , a quality-of-service (QoS) indication for the requested transmission claim 1 , ...

Wireless Communication Method, Network Device and Terminal Device

A wireless communication method, a network device and a terminal device are provided. The method comprises: transmitting a first control channel in a first period of time, wherein the first control channel carries scheduling information of a first data channel; receiving or transmitting the first data channel in a second period of time according to the scheduling information of the first data channel; transmitting a second control channel in a frequency division multiplexing manner with the first data channel at part time of the second period of time, wherein a data channel scheduled by the second control channel does not include the first data channel, and a starting position of the part time is not earlier than an ending position of the first period of time. 1. A method for wireless communication , comprising:transmitting a first control channel in a first period of time, wherein the first control channel carries scheduling information of a first data channel;receiving or transmitting the first data channel in a second period of time according to the scheduling information of the first data channel; andtransmitting a second control channel in a frequency division multiplexing manner with the first data channel in part time of the second period of time, wherein a data channel scheduled by the second control channel does not comprise the first data channel, and a starting position of the part time is not earlier than an ending position of the first period of time.2. The method according to claim 1 , wherein a starting position of the first period of time is earlier than a starting position of the second period of time claim 1 , the first control channel between the starting position of the first period of time and the starting position of the second period of time claim 1 , and a second data channel are frequency division multiplexed claim 1 , and the second data channel is scheduled by a control channel before the first control channel.3. The method according to ...

Telephone Call Processing

Method and system for processing a telephone call comprising initiating a telephone call. Taking a first action if the telephone call is answered before a call alert is initiated. Taking a second action if the telephone call is answered after the call alert is initiated. Furthermore, a first action may be taken if the telephone call is answered before a call alert is initiated or if the telephone call is answered within a time period following the call alert being initiated. The second action may be taken if the telephone call is answered after expiry of the time period following the call alert being initiated. 1. A method of processing a telephone call comprising the steps of:initiating a telephone call;taking a first action if the telephone call is answered before a call alert is initiated; andtaking a second action if the telephone call is answered after the call alert is initiated.2. A method of processing a telephone call comprising the steps of:initiating a telephone call;taking a first action if the telephone call is answered within a time period following a call alert being initiated; andtaking a second action if the telephone call is answered after expiry of the time period following the call alert being initiated.3. A method of processing a telephone call comprising the steps of:initiating a telephone call;taking a first action if the telephone call is answered before a call alert is initiated or if the telephone call is answered within a time period following the call alert being initiated; andtaking a second action if the telephone call is answered after expiry of the time period following the call alert being initiated.4. The method according to any of to , wherein the first action is terminating the call and the second action is allowing the call to proceed.5. The method according to any of to , wherein the first action is determining that the call has been answered by a non-human and the second action is determining that the call has been answered by ...

可聴音識別回路

(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。

Device for receiving multiple-frequency signals

Patent DE3323608C2

Private branch exchange

Method for discriminating signal

(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。

Data communication system

Tone signal detection method and tone signal detector

Multifrequency sound detector

一种多频音检测器,其分析窗口(即滤波器尺寸)的选择使得频谱零点位于所关注的邻近频率。检音器的判定逻辑块使用滤波器的滚降特性以及背景噪声来确定任何过分偏离其额定值的音调的阈值通过/失败。本发明的上述方面导致了与现有技术检音器相比更简单的滤波器设计(即,阶数降低)。

Telephone equipment

Private exchanger

The apparatus comprises a national line contacting means(10) for connecting national line switchboard(100) and modulating a volume level of input/output signal data by a controlling signal, an extension contacting means(20) for connecting an extension subscribers and modulating a volume level of input/output signal data by a controlling signal, a tone detecting means(40) for detecting a tone signal transmitted for national line switchboard, a switching means(50) of transmission route for performing a transmission route and connecting the national line contacting unit for detection of tone signal, controlling the switching means, performing a transmission route, controlling a national line contacting means and a extension contacting means, and modulating a volume level. The apparatus can be maximize a telephone call of exact acoustic sound.

A method and apparatus of PABX capacity expansion using Fast Ethernet

본 발명은 100Mbps 패스트 이더넷을 이용하여 사설교환기의 용량을 확장하는 것으로, N개의 가입자 용량을 처리하는 가입자 노드 M개와 하나의 중앙 제어 노드를 100Mbps 패스트 이더넷으로 이용하여 하나의 가입자 노드가 가질 수 있는 수용량의 한계를 범용적인 100M bps 패스트 이더넷을 활용하여 추가 선로가 없어도 가능하고, 개개의 가입자 노드별로 스위치를 설치하지 않고 중앙 제어 노드에 구비된 하나의 스위치에서 모든 스위칭을 처리하므로 스위칭 동작이 간편하고 스위치 또한 일반적인 TDM 스위치를 이용하여 구성하므로 쉽게 구현 가능한 패스트 이더넷을 활용한 사설교환기의 용량 확장 장치 및 방법이다. 본 발명은 하나의 기본노드가 가지는 가입자 수의 제약을 범용적인 이더넷을 이용하고 선로를 추가로 설치하지 아니하고 하나의 중앙제어보드에서 모든 스위칭을 처리하므로 스위칭 동작이 간편하며, 스위치는 일반적인 TDM스위치를 이용할 수 있으므로 쉽게 구현할 수 있다. The present invention extends the capacity of a private exchange by using 100 Mbps Fast Ethernet. A capacity of one subscriber node by using M subscriber nodes processing N subscriber capacity and one central control node as 100 Mbps Fast Ethernet is provided. It is possible to use the limitation of the general 100M bps Fast Ethernet without additional lines, and the switching operation is simple because the switch handles all the switching in one switch of the central control node without installing the switch for each subscriber node. In addition, it is a capacity expansion device and method of a private exchange using Fast Ethernet, which can be easily implemented by using a general TDM switch. The present invention uses a universal Ethernet to limit the number of subscribers of one basic node and does not install additional lines, so all switching is handled at one central control board, so switching operation is simple, and the switch is a general TDM switch. It's available, so it's easy to implement. 사설교환기, 가입자 노드, 중앙 제어 노드, 가입자 보드, 이더넷 변환기. Private Exchange, Subscriber Node, Central Control Node, Subscriber Board, Ethernet Converter.

Multidirectional radio communication system

Tone-generator of digital type exchange

내용 없음. No content.

Connecting device between system and interfaces in wireless private exchange system

본 발명은 무선사설 교환시스템에서의 시스템 본체와 접속장치간 연결장치에 관한 것이다. 본 발명은 시스템 본체와 접속장치를 연결하는 경우 음성정보와 제어정보를 분리하여 음성정보를 라인을 통해 전달하고 제어정보를 다수의 모뎀을 통해 전달하므로, 시스템 본체와 접속장치간의 이격거리를 종래보다 훨씬 더 연장할 수 있다. 따라서, 셀 영역을 종래보다 더욱 확장할 수 있어 통화 서비스 영역을 효과적으로 확장할 수 있게 된다. The present invention relates to a connection device between a system main body and a connection device in a wireless private exchange system. In the present invention, when the system main body and the connection device are connected, the voice information and the control information are separated, and the voice information is transmitted through a line, and the control information is transmitted through a plurality of modems. It can be extended much further. Therefore, the cell area can be further expanded than before, and the call service area can be effectively extended.

Subscriber line signalling device

Telephone and signal system

Protecting device for multifrequency detector from faulty operation

1518473 Selective signalling TELEFONAKTIEBOLAGET L M ERICSSON 1 Feb 1977 [9 Feb 1976] 04112/77 Heading G4H [Also in Division H3] A reference generator (Fig. 2) for a multifrequency receiver discriminates against interference frequency bursts by their duration. The receiver has, for each possible frequency, in parallel, a band-pass filter feeding a rectifier feeding a comparator, the comparators also receiving the reference Uref from the reference generator (Fig. 2) which is fed with the receiver input I. In Fig. 2, RL is a full-wave rectifier, G1 and G2 are gates each of which passes the larger of its two inputs, CF1 and CF2 are comparators, DF1 and DF2 are attenuators, RC is an RC circuit, and Ut1 and Ut2 are reference levels. Initially, the RC input to CF2 is less than Ut2 so CF2 provides the larger of its two possible outputs which will be the larger of the two inputs to G2 so Uref will equal it and there will be no output from the receiver. However if a signal is received at I, its peaks will exceed the lower input to CF1 thus producing pulses to charge up RC. When the charge level exceeds Ut2, CF2 provides the lower of its two possible outputs so Uref will become equal to the left input to G2 so there can be outputs from the receiver.

Patent FR2344190B1

Automatic telephone subscriber identification appts. - has digital correlation detector rapidly sensing off hook condition of subscriber lines

The automatic subscriber identification appts. is suitable for use with a telephone exchange network (1). The exchange is connected between trunk (3) and subscriber lines (2) and the appts. comprises an off hook condition detector (5) on one of the trunk lines connected to the appts. A feedback path exists between the trunk lines (3) and the subscriber lines (2). The feedback signal is digital, and the tester comprises a digital correlation detector connected to each subscriber line. One input receives a subscriber line signal, and the second receives a digital test signal corresponding to the feedback, the detector comparing their polarities.

METHOD AND DEVICE FOR DETECTING AN ALERT SIGNAL ON A TELEPHONE LINE

Pour détecter un signal d'alerte multifréquence sur une ligne téléphonique (L), on obtient un signal de prédétection (IN) qui est dans un premier état lorsque chaque composante fréquentielle du signal d'alerte est observée sur la ligne et dans un second état dans le cas contraire, et on analyse l'évolution dans le temps du signal de prédétection pour produire un signal de détection (AL) ayant des états correspondant à ceux du signal de prédétection. Le signal de détection (AL) est élaboré de façon que chacun de ses changements d'état intervienne après que se soit écoulé un temps de garde déterminé à partir d'un changement d'état correspondant du signal de prédétection (IN), ce temps de garde écoulé comportant une période initiale de durée déterminée pendant laquelle le signal de prédétection reste dans l'état contraire à celui du signal de détection, suivie par une deuxième période pendant laquelle le signal de prédétection peut changer d'état dans des conditions déterminées. To detect a multifrequency alert signal on a telephone line (L), a predetection signal (IN) is obtained which is in a first state when each frequency component of the alert signal is observed on the line and in a second state. otherwise, and the evolution over time of the predetection signal is analyzed to produce a detection signal (AL) having states corresponding to those of the predetection signal. The detection signal (AL) is designed so that each of its changes of state occurs after a guard time has elapsed determined from a corresponding change of state of the predetection signal (IN), this time guard period has elapsed comprising an initial period of determined duration during which the predetection signal remains in the state opposite to that of the detection signal, followed by a second period during which the predetection signal can change state under determined conditions.

Tone signal generator for time multiplex telephone exchange - reads out stored waveform samples under stored instruction control, incremented after each tone cycle (BE 12.12.80)

In a time division multiplex telephone exchange, tone signals are supplied by a digital signal generator. Each tone frequency is stored as a sequence of 8-bit words representing successive samples of one cycle. They are read out, one at a time, and sent in the appropriate time channel by a logic instruction circuit. Specifications for signals, e.g. a 4-tone signal, are stored as sets of 4 words and are read out by the logic circuit, controlled by a clock driven channel selector. The generation of a signal is monitored by a word stored in a transmission control store. It is incremented after each cycle of tone and compared with the specification to control duration of tone, spacing and switching to next frequency. Sixteen such signals are generated continuously and sent in different time channels.

TELEPHONE INSTALLATION

Tone receiver in digital data communication system

A device for detecting the presence of an alarm tone of a given frequency within a received signal carrying digital data in addition to said tone. The receiver comprises an analog-to-digital converter (42) the output of which is applied to a first recursive bandpass filter centered at the frequency of the alarm tone and the feedback loop of which includes a limiter. In addition, an input feedforward loop is provided for adding (at 58) the output signal from the converter (42), as multiplied by a coefficient gamma , to the output signal from the limiter. The output signal from the adder (58) is hard limited (at 44), then passed through a second bandpass filter. The energy of the signal obtained at the output of said second filter is then measured to provide indication of a tone's being received when said energy exceeds a predetermined threshold.

METHOD AND DEVICE FOR DETECTING THE PRESENCE OF A PERIODIC SIGNAL OF A KNOWN PERIOD

Patent FR2459597B1

METHOD FOR MANAGING CALL COLLISION IN A D-CHANNEL TYPE CHANNEL

Pulse retransmitter signaler

Telecommunication system which is controlled by computer

FIELD: communications. SUBSTANCE: device has central control computer, commutator, two data memory units, program memory unit, groups of system and peripheral interface devices for voice and data transmission. Commutator is designed for simplex voice transmission through four-wire communication line. Commutator is connected to system and peripheral interface devices using two wires. EFFECT: increased functional capabilities. 5 cl, 6 dwg зЗоо0эО0гс пы Го (19) РОССИЙСКОЕ АГЕНТСТВО ПО ПАТЕНТАМ И ТОВАРНЫМ ЗНАКАМ ВИ “” 2 106 008 ' С 06 Е 15/00, 15/16 (51) МПК 13) СЛ 12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ РОССИЙСКОЙ ФЕДЕРАЦИИ (21), (22) Заявка: 93004619/09, 25.03.1993 (30) Приоритет: 25.03.1992 ОЕ Р 4210167.0 (46) Дата публикации: 27.02.1998 (56) Ссылки: 1. ОЕ, пат ент, 3923960, кл. Н 04 @ 3/54, 1989. 2. ОЕ, патент, 3442144, кл. Н 03 М 100, 1986. (71) Заявитель: ДеТеВе-Дойче Телефонверке Акциенгезельшафт унд Ко. (ОЕ) (72) Изобретатель: Рольф Баумайстер[ПЕ], Уве Думманн[ОЕ], Клаус-Петер Эрзель:[ОЕ], Хорст Йэкелы[ОЕ], Флориан Янковски[ОЕ], Гюнтер Кернер[ОЕ] (73) Патентообладатель: ДеТеВе-Дойче Телефонверке Акциенгезельшафт унд Ко. (ОЕ) (54) УПРАВЛЯЕМАЯ ОТ ЭВМ ТЕЛЕКОММУНИКАЦИОННАЯ УСТАНОВКА (57) Реферат: Изобретение касается управляемой от ЭВМ телекоммуникационной — установки, содержащий центральную управляющую ЭВМ, блок коммутации, два блока памяти данных, блок памяти программ, группы системных и —внесистемных устройств сопряжения для передачи речи и данных, причем блок коммутации выполнен с возможностью однонаправленной передачи речи через четырехпроводный канал связи, соединение блока коммутации с системными и внесистемными устройствами сопряжения выполнено двухпроводным. 4 з.п. ф-лы, 6 ил. ^, 1 м... ооьаввьь о > кк -> жк Г <- Ха. „. кк --+ Ка я а ж----------д--+ 4-4 ---- [_* Е 111111 Регуривхде [$35] {У 1 [4 .||зех42}1 раха11е1 5ег1е1}. раха].1е1 фиг.1 2106008 С1 КО зЗоо0эО0гс пы Го 9) тщу"” 2 406 008 “”С4 51) мЕ С° < 06 Е 15/00, 15/16 КУЗЗАМ АСЕМСУ ГОК РАТЕМТ$ АМО ТКАОЕМАКК ...

Patent FR2141502B1

Device for receiving call pulses

Improvements to telephone transmissions

Voice frequency receivers

Patent FR2304899B1

Transistor-switched signal transmission system

MULTI-FREQUENCY TONE DETECTOR

L'invention concerne un détecteur de tonalités.Elle se rapporte â un détecteur qui comprend un filtre d'analyse (3) qui détecte les énergies des tonalités d'un signal d'entrée, et un bloc logique (7) de décision. Un calculateur (5) calcule l'énergie totale du signal d'entrée, et le bloc logique (7) détecte la présence ou l'absence des fréquences de tonalités par calcul de l'énergie du fond continu sous forme de l'énergie totale réduite des énergies des tonalités du signal d'entrée aux fréquences intéressantes et, pour chacune des énergies de tonalité, par calcul d'un rapport signal-sur-bruit d'élimination, et suppression de celle des fréquences de tonalités pour lesquelles les énergies sont inférieures au rapport signal-sur-bruit d'élimination multiplié par l'énergie du bruit de fond.Application aux systèmes téléphoniques. The invention relates to a tone detector. It relates to a detector which comprises an analysis filter (3) which detects the energies of tones of an input signal, and a decision logic block (7). A calculator (5) calculates the total energy of the input signal, and the logic block (7) detects the presence or absence of the tone frequencies by calculating the energy of the continuous background as the total energy reducing the energies of the tones of the input signal at the frequencies of interest and, for each of the tone energies, by calculating a signal-to-noise elimination ratio, and removing that of the tone frequencies for which the energies are less than the elimination signal-to-noise ratio times the background noise energy. Application to telephone systems.

Transistor switching circuit

Training for flaggers

Patent FR2340659B1

Improvements to electrical signaling systems

METHOD AND DEVICE FOR DETECTING AN ALERT SIGNAL ON A TELEPHONE LINE

High voltage low frequency signal transmitter using a carrier current link

Ce dispositif est en deux parties : une partie émission et une partie réception disposées de part et d'autre de la liaison à courants porteurs. La partie émission permet de moduler par tout ou rien, au double de la fréquence de ladite signalisation, une des porteuses utilisées dans la liaison à courants porteurs. La partie réception permet de détecter la modulation de porteuse par tout ou rien et de l'utiliser pour commuter alternativement deux tensions de signes opposés délivrées par un mutateur haute fréquence piloté éventuellement par un sous multiple de l'une des porteuses utilisées dans la liaison à courants porteurs.

Improvements to electrical signaling devices

APPARATUS FOR TESTING A DIGITAL ASYMMETRIC LINK

Cet appareil de test d'une liaison téléphonique numérique à débit asymétrique comporte, disposés dans un boîtier (40), un générateur (42) de signaux à basse fréquence adapté pour être raccordé à un bornier d'entrée d'un multiplexeur d'accès d'un central téléphonique et pour injecter dans ce dernier un signal simulant la présence d'une ligne téléphonique, un amplificateur (46) associé à un haut-parleur destiné à être raccordé à un bornier de sortie dudit multiplexeur et à récupérer et amplifier le signal émis par le générateur jusqu'à un niveau audible, et un modem (44) destiné à être raccordé avec ledit bornier de sortie pour tester un modem du multiplexeur d'accès par contrôle de synchronisation entre ces modems. This device for testing an asymmetric speed digital telephone link comprises, arranged in a housing (40), a generator (42) of low frequency signals adapted to be connected to an input terminal block of an access multiplexer. of a telephone exchange and to inject into the latter a signal simulating the presence of a telephone line, an amplifier (46) associated with a loudspeaker intended to be connected to an output terminal of said multiplexer and to recover and amplify the signal transmitted by the generator up to an audible level, and a modem (44) intended to be connected with said output terminal block to test a modem of the access multiplexer by synchronization control between these modems.

METHOD AND DEVICE FOR DETECTING THE PRESENCE OF A PERIODIC SIGNAL IN A SET OF SIGNALS

Le signal présente une répétition périodique d'une fréquence pendant une durée prédéterminée (TON ), la fréquence, la période T et la durée (TON ) sont affectées de tolérances (dT, dTON ) respectives prédéterminées. Le procédé comporte: la discrimination de la fréquence considérée des autres fréquences et la délivrance d'un signal de sortie à deux niveaux; l'échantillonnage de ce dernier sur une durée au moins égale à deux périodes maximales T + dT; la détection et la pesée de série d'échantillons Si de niveau correspondant à la présence de ladite fréquence; la création d'un historique en projetant dans un intervalle de temps futur compris entre ti + Tmin et ti + Tmax une valeur Histo (j) égale au poids Pi des séries Si sauf s'il a été affecté à chaque instant tj de cet intervalle une valeur plus forte; la corrélation entre le poids Pi calculé le cas échéant pour la série Sj de l'instant tj et la valeur Histo (j) correspondant au poids Pi relatif à la série repérée en ti , et la décision de la présence ou de l'absence du signal en fonction d'un critère de décision prédéterminé. Application à la détection du CNG. The signal has a periodic repetition of a frequency for a predetermined duration (TON), the frequency, period T and duration (TON) are assigned respective predetermined tolerances (dT, dTON). The method comprises: discriminating the considered frequency from other frequencies and providing an output signal at two levels; sampling the latter over a period at least equal to two maximum periods T + dT; detecting and weighing a series of Si samples of a level corresponding to the presence of said frequency; the creation of a history by projecting into a future time interval between ti + Tmin and ti + Tmax a Histo (j) value equal to the weight Pi of the series Si unless it has been assigned at each instant tj of this interval a higher value; the correlation between the weight Pi calculated where appropriate for the series Sj of ...

Improvements to electric rectifiers

Polite call waiting notification

A technique for notifying a person who is engaged in a telephone call with a second person that a third person is calling him or her is disclosed. In particular, the illustrative embodiments wait for an "appropriate opportunity" to notify person 101-1 of the arrival of the incoming message from person 101-3. For example, the appropriate opportunity is chosen so that it is, at least potentially, less disruptive to the conversation between person 101-1 and person 101-2 than would an arbitrarily-timed notification.

Patent FR2315809B1

Voice frequency receiver

Improvements to electrical signaling systems

Improvements to electrical signaling systems

Low frequency telephony pulse detector - detects test signal in synchronism with strong active signal presence

The circuit is used in telephony when line checking at 50Hz and 450Hz. The locally generated signal at high level is connected to a bridge rectifier (D4-7) and it provides the supply to a transistor detector stage (T5). The test signal after attenuation through line equipment is amplified and squared (T1, T2) and slaves a monstable multivibrator (T3, T4). This square-wave passes to the detector and if the stage is active (i.e. the high level signal is present) a diode and capacitor circuit (D2, C7) links it to an output transistor that provides an output signal and energises a light-emitting diode. This circuit protects against false readings caused by parasitic voltages by its system of coincidence detection.

Apparatus for testing an asymmetric digital subscriber line

This apparatus for testing an asymmetric digital subscriber line includes, arranged in a case, a low-frequency signal generator which generator is adapted to be connected to an input terminal block of an access multiplexer of a telephone exchange and which generator is adapted to inject into the latter a signal simulating the presence of a telephone line, an amplifier linked to a speaker and intended to be connected to an output terminal block of the said multiplexer and intended to retrieve and amplify the signal transmitted by the generator to an audible level, and a modem intended to be connected to the said output terminal block to test a modem of the access multiplexer by checking synchronization between these modems.

Improvements in or relating to electric selective signalling and control systems

558,298. Electric. selective signalling. JONES, C. E. P., and BIRSS, R. R. June 26, 1942, Nos. 8788 and 14191. [Class 40 (i)] [Also in Group XXXIX] Information e.g. digit values in automatic telephony, is transmitted by means of two currents differing in amplitude, frequency or phase by an amount corresponding to a number of steps, the two currents being separated on reception and used to set a selective device in accordance with the number of steps. If carrier current is used, the information may be transmitted by carriers modulated to different depths or by varying the amplitude and depth of modulation respectively of a single carrier. As described, one of the currents is of constant amplitude, frequency or phase and in the case of amplitude, this current may set the gain of the receiving amplifier of the other current in accordance with variations of the constant current as received, in which case the amplitude of the other current itself furnishes the information. Figs. 1 and 2 show the transmitter and receiver of a system in which digit values are transmitted as relative amplitudes of two alternating currents of frequencies, X, Y, frequency X being transmitted at constant level and Y at levels dependent on the digit, 2¢ decibels being used. as a unit for example. At the transmitter, contacts d, k of the dialling key transmit frequency X and connect up a 10-step attenuator VA for frequency Y, the attenuator being set by switch DS in response to an impulse train. At the receiver, the frequencies are separated by filter amplifiers SAX, SAY, rectified and applied to "logarithmic units" LUX, LUY the outputs of which are applied in opposition to resistance YA. The logarithmic units may be such as are referred to in Specification 438,839, [Group XXXIX], and convert the decibel units. of the input into linear units of D.C. corresponding to the digit transmitted. The voltage across. YA may be used to determine a train of impulses over circuit 20, 21 Fig. 6 ...

Private branch exchange and private branch exchange control method

A private branch exchange changes the load distribution according to the use condition by a main control unit and a sub-control unit. A line card comprises a first module group normally carrying out various operations in response to an instruction of the sub-control unit, a second module group carrying out various operations in response to the sub-control unit or the main control unit, a bus arbitration circuit, and an internal module bus selecting unit having a bypass selector for bypassing the bus arbitration circuit. The main control unit predicts the load on a system at the start of the system from the information stored in the incorporated line card, and determines, considering the prediction result, whether the control is made by the sub-control unit or the main control unit, for each module of each line card.

Electrical signaling

Method and device for providing service features for mobile subscribers over a communication network

The process involves an external terminal appts. (KE1) logging on at a communication system (PBX) and a speech connection (SV) is set up between the external end unit and a teleworking participant connective group (T-BG) of the communication system. Control information input to the external unit (KE1) are transmitted via the speech connection in the form of DTMF signals. At the teleworking side, the signals are changed to signalising information according to a signalisation protocol (Cornet -TS) and are transferred to a control unit (STE) of the communication system. The teleworking participant connective group has a teleworking computer (TW-S) connected via a local area network. The computer controls the group. The control information received at the group are transmitted via the computer to the control unit.

Computer controlled telecommunication system and sub-systems of such telecommunication system

Sound operated electric gear

568,887. Controlling apparatus by sound. TELCS, M. L. Dec. 14, 1942, No. 17741. [Class 40 (i)] In a system for controlling, e.g. typewriters, by sounds, frequency-separation of the resulting sound currents is facilitated by multiplying the frequencies of these currents and subtracting a fixed frequency. This may be done by apparatus shown in Fig. 3 in which a thermionic tube VI, organized so that a strong double-frequency component appears in its ouput circuit, is coupled to a heptode mixer, the inner grids of which are coupled as shown to generate a frequency of (say) 400 cycles. The difference frequencies are selected and have a greater percentage separation than the original frequencies. A separate frequency-converting system may be used for each of several microphones which are themselves made strongly selective. Specification 568,912 is referred to.

Common automatic route selection leading digit strings

A communication switching system comprised of (a) apparatus for receiving dialed digits relating to a call, (b) apparatus for storing a table of groups of initial digits and for each group of initial digits storing a subtable, each subtable being comprised of a list of quantities of digits expected to follow a corresponding group of initial digits, each quantity being correlated with a communication route, each list of quantities of digits being sorted in ascending order, (c) apparatus for selecting a group of initial digits in the table corresponding to first digits of the dialed digits, and for pointing to a communication route corresponding to a lowest quantity of digits in a subtable of selective group of initial digits, (d) apparatus for using the communication route for completion of the call in the event the dialed digits contain a quantity of digits corresponding to the lowest quantity of digits, (e) apparatus for detecting a dialed digit in excess of the quantity of digits and for pointing instead to a next highest quantity of digits in the subtable of the selected group of initial digits, (f) apparatus for repeating step (e) until no dialed digit is detected which is in excess of a highest quantity of digits pointed to and using a corresponding communication route listed in the subtable for completion of the call.

System for the conversion and retransmission of control signals

Multiplex transmission device

The present invention concerns multiplex transmission equipment that transmits a speech, signal, a facsimile signal, a voice band data signal and similar transmission signals in compressed and multiplexed form. A signaling signal corresponding to the signaling system of each signal transmission system is detected and the operation of an echo canceller during signaling is controlled accordingly. This operation control of the echo canceller permits normal transmission of the signaling signal, and establishes communications between multiplex transmission equipment and the counterpart, allowing signal transmission subsequent to signaling.

PBX switching circuit with isolating relay - prevents connection of second subscriber unit with operation maintained by bridging switching unit

A circuit for telephone private branch exchanges includes at least one transmission unit (UE) through which a transmission path (Ta, Tb, Aa, Ab) passes from a subscriber unit (T1) to a remote exchange unit (AZ). The transmission unit is connectable to an operator answering point (AP) by a switching path consisting of couplers (K1, K3) and a control unit (AS) which are connected to a manually controllable coupler (4K). After completion of switching (c1) a supervisory path (c3) to a manually releasable isolating relay (T) is activated. During the isolating procedure and for the time necessary for the operation of the control unit (ST), a relay (B) in the transmission unit is energised to inhibit the connection of another subscriber (Tn) location. Operation of the relay is maintained by a bridging switching circuit (c3, t1, b3).

RECEIVER OF CODED SIGNALS AT TWO ACOUSTIC FREQUENCIES CHOSEN FROM SEVERAL

Modulation and demodulation system

Vacuum-bulb for signaling apparatus

Means for ringing over multiplex transmission channels

Multiplex transmission device

The invention relates to a multiplex transmission device that compresses, multiplexes and transmits a signal, such as a voice signal, a facsimile signal and a speech data signal. The signaling signals corresponding to various types of signaling systems are detected, and the operation of an echo canceler during signaling is controlled. The control of the echo canceller allows normal transmission of signaling signals, and thus the communication between multiplex transmission devices is established, and signal transmission is allowed after signaling.

Improvements in or relating to voice frequency signalling receivers

888,981. Voice immunity circuits. STANDARD TELEPHONES & CABLES Ltd. July 28, 1960, No. 26236/60. Class 40 (4). In a V.F. receiver of the single frequency type, means therein for generating an output signal for the operation of a telephone exchange, is responsive only when a tone at the signalling frequency exceeds a specified level. Voice frequency input signals pass through a transistor amplifier 1 and amplitude limiter 2 to a dividing network 3, e.g. a transformer. Assuming that speech or excessive line noise is being received, then after any harmonics of the signalling frequency have been removed in a lowpass filter (L.C. type) 4, the signals are passed through a common base transistor amplifier 5, a band stop filter 6, which removes any signalling frequency present, and a negative feedback amplifier 7, using a transistor connected as an emitter follower, to a detector 8. The detected signal, after being limited by a suitably arranged pair of diodes at 9 and delayed in a C.R. network, is applied as a guard voltage to a transistor amplifier 10 in the signalling circuit. It is stated that the guard voltage especially when developed by excessive line noise is limited sufficiently to allow it to decay rapidly so as to reduce distortion of a first incoming signal. A common base type transistor amplifier 10, which contains an acceptor resonance circuit tuned to the signalling frequency, operates in response to a tone at the signalling frequency and this signal after detection at 11 is applied as a negativegoing pulse to the base of a transistor which acts as a level filter 12. If the base voltage becomes lower than the emitter voltage, i.e. the tone at the signalling frequency is of sufficient amplitude, the transistor bottoms and a relay 13 is operated. In order to reduce duration distortion of the signal a condenser in a relay slugging circuit is charged by a portion of the collector current feeding the relay and, at the end of the signalling pulse, it discharges ...

Domestic telephone communication system - uses microprocessor control which switches extension to exchange bus=bar for ringing

The telephone system for installation in a home allows one main and four extensions to make internal calls or use the exchange line. All telephones are normally switched to the house busbar. An internal call is made by lifting a receiver and dialling the called extension number. Other extensions can join in by lifting their receivers or can be called by dialling the numbers. The microprocessor switches the called extension to the exchange busbar and connects the ringing supply to it. When the called extension answers, the microprocessor switches it back to the house busbar. An incoming call on the exchange line is detected by the microprocessor, which switches the main to the exchange busbar and rings it. When the main answers, the exchange busbar is switched through to the exchange line. A loud bell can be switched on and an extension can answer an outside call by dialling the exchange code.

DEVICE INTENDED TO FORM A CLOSED GROUP AMONG SEVERAL TERMINALS CONNECTED TO A SWITCHING NETWORK

Process and device for the extraction of organic acids and bases from beetroot molasses

Single frequency detection circuit

SINGLE FREQUENCY DETECTION CIRCUIT Abstract of the Disclosure A single frequency tone detection circuit for detecting a signalling tone in the presence of guard (i.e. voice) signals on a telephone line. The circuit utilizes a unique arrangement for separating the tone and voice signals by first rectifying and then filtering the incoming signal to eliminate any fundamental component of the signalling tone. The signals are then separated by low and high-pass filters into d-c and a-c components and after further processing their magnitudes are compared to ascertain whether or not a valid signalling tone is present.

Dialling units in PBX's - consist of MOS subassemblies and evaluate key dialling signals

Key dialling signals converted into binary values are, on application of a first clock pulse, received by a first register through the dialling unit inputs. When the second clock pulse appears, they again arrive at the same dialling unit inputs, and after reception of the second key dialled digit they are again stored in the first register, connected by an adder to a shifting pulse source wich adds the register contents and retransmits them for further connection build-up to further switching elements. After the first clock pulse reception the first register input is blocked through an AND circuit, its output is unblocked, and a second register prepared for the converted signal reception.

Method for data transmission in communication exchanges

Electrical signal transmission system

554,786. Electric signalling systems. STANDARD TELEPHONES & CABLES, Ltd. (International Standard Electric Corporation). July 9, 1942, No. 9540. [Class 40 (i)] [Also in Group XXXIX] In an arrangement for signalling over a circuit which may form part of a telephone connection, synchronous impulses are created at the transmitting and receiving ends and a counting switch stepped by the impulses at the transmitting end determines the duration of transmission of continuous A.C. to the receiving end to render effective a certain number of the impulses thereat. As shown, the impulses are supplied by generators IMP1, 2 which in the case of signalling within an exchange may consist of cams mounted on a common shaft. When the generators are located in different exchanges they may be synchronized by known methods. Signalling is started by the closure of contacts St1, 2 at the two ends, whereupon IMP1 controls relay B3 and IMP2 steps the switch SS. As soon as the latter moves offnormal, A.C. preferably of .voice frequency is sent over wire X of the connection and, through a transformer T, causes a cold-cathode tube L to strike, thereby putting relay B4 under the control of B3 to repeat impulses. When the switch SS reaches a marked contact, relay B2 energizes and cuts off the A.C. to terminate the repetition of impulses.

System for differentiating between long distance and local calls by means of reverse identification of public exchanges

Circuit arrangement for bringing about switching processes via connecting lines

Voice frequency signal transmission circuit

Improvements in or relating to telephone or like systems

571,908. Automatic exchange systems. AUTOMATIC TELEPHONE & ELECTRIC CO., Ltd., GILLINGS, C., and BEALE, C. E. Feb. 19, 1944, No. 3129. [Class 40 (iv)] In a system in which voice-frequency impulses arriving at the incoming end of a junction are repeated forward as direct current impulses, the first impulse of each train is not repeated, but serves only to disable the transmission path between the junction and the incoming selector in order to guard against backward surges which might affect the echo-suppressors, an additional direct current impulse being generated at the end of the train and the disablement being maintained throughout the train and for a further period sufficient to cover a hunting operation. A VF seizing signal energizes relays L, NR, AR (not shown), of which L introduces the combined loss pad and termination YA ... YE, while NR connects - up the line relay A of the incoming selector. Relay AR releases in response to each numerical impulse, and relays EB, EM are so arranged that EB is energized at each break of AR and short-circuited at each make, whereas EM is energized at each make and short-circuited at each break. At the first break, EB connects up SG which opens the transmission path and at the subsequent make EM connects up C which completes the usual loop circuit for relay A, the succeeding impulses being repeated by AR. At the end of the incoming train, EB, EM relapse in turn and generate an additional impulse in the outgoing loop circuit. The relapse of C, SG follows and the transmission path is restored. The release lag of EB is such that the make period preceding the locally generated impulse is not long enough to release the C relay of the selector, while the lag of EM is such that it terminates an outgoing impulse ahead of AR if the break period imposed by that relay is unduly long.

MULTIFREQUENCY SIGNALER AND IN PARTICULAR ITS SIGNALING RECEIVER

V. F. Receiver

1,179,614. Voice-frequency receivers. INTERNATIONAL STANDARD ELECTRIC CORP. 30 Nov., 1967 [3 Dec., 1966], No. 54595/67. Heading H4R. A voice-frequency receiver distinguishes single frequency signals by the fact that they exceed lower and upper thresholds during each positive excursion whereas more complex signals may have positive excursions that exceed only one of the thresholds. As illustrated the invention is applied to a receiver for two 1-out-of-n V.F. codes, one signal being in an upper band passed by Vra while the other signal is in a lower band passed by Vrb. Considering the upper band alone: a received signal is applied to a threshold device V11 tied to a low threshold potential Uv1 (possibly zero), and a threshold device V21 tied to a high threshold potential Uv2. The potential Uv1 is taken from a potential divider and is fixed while the potential Vv2 is varied by a transistor PS in accordance with the average value of the received signal. Both thresholds may be fixed or both may be dependent on average signal value. When the lower threshold is exceeded a differentiator DG11 pulses a delay circuit T11 and an AND gate U11. When the upper threshold is exceeded a differentiator DG21 pulses a delay circuit T21 and an AND gate U21. After the differentiator outputs have subsided the delay circuit outputs set or reset a bi-stable FF1. So long, therefore, as FF1 is not already in the state to which a delay circuit output directs it the gates U11, U21 will remain closed. If, as will happen with a signal waveform of single frequency, a positive-going excursion crosses both thresholds in turn, bistable FF1 is switched back and forth the gates U11, U21, remaining closed. If the waveform is such, however, that it only exceeds one of the thresholds during a positive-going excursion (either because the excursion is not great enough to reach the high threshold or starts from above the low threshold) one of the thresholds is exceeded twice without the other being exceeded ...

Telegraph signal reception device

Apparatus and method for detecting a two-tone multi-frequency signal

Improvements to electrical switching devices

How to improve the performance of network signal processing platforms and telephone networks

본 발명은 고객의 구내 장비와의 네트워크 접속에 관한 것이다. 네트워크 신호 처리기는 신호 처리 플랫포옴이 사용중 임을 나타내는 태그 신호(tag signal)를 내보낸다. 고객 구내 장비(Customer Premises Equipment : CPE)는 태그 신호의 검출에 따라서 조정 신호를 네트워크 신호 처리기에 내보낸다. 고객 구내 장비는 신호 손실을 측정하고, 이득 매핑을 조절하며, 조정 신호를 고객 구내 장비로 내보내는 네트워크 신호 처리기에 조정 신호를 출력한다. 이때 고객 구내 장비는 네트워크 신호 처리기로부터의 조정 신호에 의거하여 스펙트럼의 형태를 평가하고 신호 처리 플랫포옴이 검출되어 구현되도록 수신 경로를 등화(이퀄라이징)한다. 본 발명의 실시예들은 전화 네트워크 유지보수에서 에이전트로서 CPE를 사용하는 보다 일반적인 개념의 예증이다. The present invention relates to a network connection with a customer premises equipment. The network signal processor emits a tag signal indicating that the signal processing platform is in use. Customer Premises Equipment (CPE) sends a coordination signal to the network signal processor upon detection of the tag signal. The customer premises equipment measures the signal loss, adjusts the gain mapping, and outputs the adjustment signal to the network signal processor that sends the adjustment signal to the customer premises equipment. The customer premises equipment then evaluates the shape of the spectrum based on the coordination signal from the network signal processor and equalizes (equalizes) the receive path so that the signal processing platform is detected and implemented. Embodiments of the present invention are an illustration of a more general concept of using CPE as an agent in telephone network maintenance.

Private network interchange unit application-oriented half-link

An interchange unit for a private telecommunications network executing partly in real time and partly in mixed mode, which interchange unit includes a half-link which has an interface using a protocol used by the interchange unit for connecting real time applications to the outside and an application-oriented interface to at least one mixed mode application. The invention enables dialog between a real time application and a mixed mode application without entailing modification of the real time applications.

Improvements in or relating to electrical carrier transmission systems

1,059,795. Multiplex radio systems; metering. TELEPHONE MANUFACTURING CO. Ltd. Oct. 12, 1965 [Oct. 23, 1964], No. 43294/64. Headings H4K and H4L. In a carrier telephone or telegraph system, a normally applied frequency of 3890 cycles is replaced during dialling impulses by a frequency of 3760 cycles, and for the purpose of metering the normal frequency is modulated at 20 cycles per second.

Circuit arrangement for calling high-frequency multiple telephone connections

Signaling system

Programmable digital call progress tone detector

A method of detecting call progress tones specified in a tone plan, is comprised of calculating a power spectrum of a segment of an input signal containing a call progress tone, discriminating, based on the power spectrum, likely frequencies of the call progress tone, determining likely tone plan frequency bands based on between one and three of the frequencies, filtering the input signal in the frequency bands and extracting quadrature components of the input signal thereby, calculating three spectral moments of the input signal from the quadrature components for the frequency bands, and verifying at least one frequency of a call progress tone contained in the input signal based on the spectral moments. <IMAGE>