СПИСОК патентов США - подгруппа МПК16 H04Q1/457


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№ п/п Номер патента Название патента

2016

19479846Low complexity tone/voice discrimination method using a rising edge of a frequency power envelope

2015

29204206Method and apparatus for transmitting signaling
39185471Method and apparatus for detecting one or more predetermined tones transmitted over a communication network
49148520Low complexity tone/voice discrimination method using a rising edge of a frequency power envelope

2005

56850616Frequency error detection methods and systems using the same

2004

66813529Method and apparatus for signal frequency decoding without an analog bandpass filter
76801622Devices, software and methods for passing DTMF signals under voice compression
86748059Apparatus and method for unified tone detection
96683944Voice transmitter

2003

106668057Apparatus for receiving tone signal, apparatus for transmitting tone signal, and apparatus for transmitting or receiving tone signal
116650662Method and system for transmitting a DTMF signal with compressed voice in a packet switching network
126608896Efficient digital ITU-compliant zero-buffering DTMF detection using the non-uniform discrete Fourier transform
136590972DTMF detection based on LPC coefficients
146580792Signal detector with automatic gain control
156560331System and method for precise DTMF signal detection

2002

166370244Efficient digital ITU-compliant zero-buffering DTMF detection using the non-uniform discrete fourier transform

2000

176046977Method and apparatus for detecting signal misalignment
186035179Transmission of voice-frequency signals in a mobile telephone system
196021192Tone detector

1999

205995557Tone detection with aliasing bandpass filters
215978676Inband signal converter, and associated method, for a digital communication system
225937059DTMF detector for detecting DTMF signals using a digital signal processing chip and method thereof

1998

235809133DTMF detector system and method which performs frequency domain energy calculations with improved performance
245765125Detection of tones while minimizing incorrect identification of other sounds as tones
255748637DTMF signaling on four-wire switched 56 KBPS lines

1997

265694466DTMF detector system and method which performs improved twist computation and thresholding
275687177Tone blocking using variable delay buffer
285666357DTMF tone passer in a voice communication system
295659606Programmable modular apparatus and method for processing digital signals and detecting telephone tones
305644634System and method for dual tone multifrequency detection using variable frame widths
315633862DTMF signal transmission method in single frequency simultaneous transmitting and receiving system and single frequency simultaneous transmitting and receiving system transceiver capable of transmitting DTMF signal
325604793Tone blocking using variable delay buffer

1996

335588053DTMF detector system and method which performs static and dynamic thresholding
345563942Digital call progress tone detection method with programmable digital call progress tone detector
355535271Apparatus and method for dual tone multifrequency signal detection
365495526Tone-detection method for detecting at least one tone in a dual-tone multifrequency signal, call-progress method using the same

1995

375479498Digital line card having universal port for upgrading electronic messaging system
385459784Dual-tone multifrequency (DTMF) signalling transparency for low-data-rate vocoders
395457690DTMF Signaling on four-wire switched 56 Kbps Lines
405442696Method and apparatus for detecting control signals
415392348DTMF detection having sample rate decimation and adaptive tone detection

1994

425353346Multi-frequency signal detector and classifier
435353345Method and apparatus for DTMF detection
445353344Method of determining levels at given frequencies of a VF signal
455343414Apparatus for adaptively tuning to a received periodic signal
465339251Apparatus for adaptively tuning to a received periodic signal
475333191Detection of multifrequency tone signals
485325427Apparatus and robust method for detecting tones
495311589Apparatus and method for audible signaling tone recognition

1993

505265097Data processor
515257309Dual tone multifrequency signal detection and identification methods and apparatus
525198992Method and apparatus for improving wideband detection of a tone
535177785Method and system for secure telecommunications

1992

545163050Configurable parameter DTMF detector
555144626Data processor
565140590Telephone or data switching system with variable protocol inter-office communication
575138569Dual tone multi-frequency detector
585127004Tone and announcement message code generator for a telephonic switching system and method
595119322Digital DTMF tone detector

1991

605073941Multifrequency detection
615047764Paging system with dynamically programmable reception frequencies

1990

624979171Announcement and tone code generator for telephonic network and method
634972466Digital composite tone alerting
644908825Memory organization and output sequencer for a signal processor

1989

654881073Paging system with dynamically programmable reception frequencies
664878051Paging system with commands for changing functionality of a paging receiver
674876538Paging system sublocal switch
684868558Paging system lata switch
694853958LPC-based DTMF receiver for secondary signalling
704839842Digital tone detection and generation

1988

714782523Tone detection process and device for implementing said process
724747131Dial tone detector
734737720DTMF generation using pre-summed tables
744718057Streamlined digital signal processor

1987

754709344Programmable multifrequency digital tone receiver
764701948Communication system having separate unidirectional information signalling
774696031Signal detection and discrimination using waveform peak factor
784694482Digital tone detector
794689760Digital tone decoder and method of decoding tones using linear prediction coding
804686490Digital data modulator and digital-to-analog converter
814679001Adaptive stop-notch filter
824669114Digital tone detector
834644476Dialing tone generation
844644345Interleaved dual bank encoder

1986

854617427Square root circuit
864614909Apparatus for identifying digital multi-frequency signals
874611325DTMF receiver sense and control arrangement
884604713Tone detector and multifrequency receiver using said detector
894602131Touch tone decoder
904599700Process and device for digital frequency generation
914571723Pulse code modulated digital telephony tone generator
924570260Digital tone signal generator for telephony system
934570235Digital receiver of multifrequency signals with frequency recognition device

1985

944541088Tone generation circuit for automatic PCM-TDM telecommunication exchange
954535454Multifrequency tone distribution using a conferencing arrangement
964510601Digital frequency receiver
974498171Tone source for telephone systems

1984

984484035Dual tone multi frequency digital detector
994479229Arrangement for and method of detecting multi-frequency sound code signals
1004479188Digital detector for a multi-frequency code in an analog signal
1014467277Programmable detector for tone signals
1024460808Adaptive signal receiving method and apparatus
1034460806Dual tone multifrequency and dial pulse receiver

1983

1044403298Adaptive techniques for automatic frequency determination and measurement
1054399536Convolution filter arrangement for digital multifrequency receiver
1064399535Digital tone generator
1074395595Digital pushbutton signalling receiver
1084393496Method for feeding call progress tones into conference connections
1094392206Printer
1104390983Digital frequency sender
1114385385Circuit for monitoring a digital signal generator
1124379347Receiver for PCM-encoded multifrequency dialing signals

1982

1134366348Method and apparatus for decoding and processing the informational content of multi-frequency signals
1144363100Detection of tones in sampled signals
1154361875Multiple tone detector and locator
1164355405Digital signalling system
1174354248Programmable multifrequency tone receiver
1184347408Multi-frequency signal receiver
1194334273Signal processing system using a digital technique
1204328398Digital multi-frequency receiver
1214319334Frequency sensing device for reducing non-periodic components

1981

1224286326Digital devices for spectrum analysis
1234279017Method and device for detecting the presence of one or more pulse code modulated multi-frequency code signals
1244255623Apparatus for pulse train measurement
1254245325Digital multifrequency signalling receiver

1980

1264230908Telephone summing circuit
1274227248PCM Tone signal generator
1284223185Multifrequency digital signal receiver
1294216463Programmable digital tone detector
1304211897Multifrequency signal receiving system
1314205203Methods and apparatus for digitally signaling sounds and tones in a PCM multiplex system
1324203008Digital signalling receiver for receiving PCM tones
1334191862Dual frequency tone decoder
1344187403Voice-protected, frequency-selective signal receiver
1354185172Method of and means for detecting digitized multi frequency-coded signals

1979

1364176286Signal translator with squelch
1374145576DTMF and rotary dial signal receiver
1384133979Multifrequency sender/receiver in a multi-time slot digital data stream

1978

1394124898Programmable clock
1404119808Multi-frequency receiver circuits
1414109109Method and apparatus for detecting the presence of signal components of predetermined frequency in multifrequency PCM signal
1424080516Multi-frequency signal receiver
1434076965Universal receiver/sender
1444070631Digital noise blanking circuit
1454068309Method and device for detecting two different frequency amplitude and phase signals in a combined digital signal
1464066846Combined rotary dial and touch-tone telephone decoding system

1977

1474061885Digital tone decoder
1484060797Serial digital bit stream code detector
1494045620Digital tone detector
1504044206Digital decoder for multiple frequency telephone signalling
1514042790Voice guard circuit for a tone receiver
1524042789Tone combination detector and coincidence timer circuit
1534042788Tone detector
1544042787Output processing and output coupling circuit for a digital tone receiver
1554041248Tone detection synchronizer
1564028501Method and apparatus for translating multiple frequency signalling
1574025730In-band signal receiver
1584021620Multifrequency signal receiver with digital tone receiver
1594018991Multifrequency signal parity detector
1604016371Frequency tone detection
1614016370Digital tone decoder
1624009353Analog signal detection
1634001521Signal identification system

1976

1643997727Time division multiplexed digital switching apparatus
1653988687Step-servoed tone detector
1663986112Novel technique for frequency detection utilizing switching filters
1673985966Method and apparatus for generating digital dual frequency signals
1683985965Digital signal generator
1693976843MFC receiver digital signal processing
1703971897Circuit arrangement for a selective signal receiver, particularly for use in telephone systems
1713965457Digital control processor
1723962541Frequency sample-and-hold circuit
1733961167PCM tone receiver using optimum statistical technique
1743959603Dual tone multiple frequency receiver/decoder
1753949177Method for frequency-recognition in selective signal receivers for use in telecommunication, particularly telephone systems
1763937899Tone detector using spectrum parameter estimation
1773936801Multifrequency signal receiver timing circuit
1783936611Time compression scanner
1793935395Selective signal receiver for use in telecommunication systems
1803934097Multifrequency tone detection
1813932708Frequency-selective signal receiver for communication equipments, more particularly telephone equipments
1823931480Time compression receiver
© 2017, ПАТ-Инфо, В.И. Карнышев
Дата формирования списка: 03.04.2017