ES2117644T3 - Eliminacion de eco residual. - Google Patents
Eliminacion de eco residual.Info
- Publication number
- ES2117644T3 ES2117644T3 ES91915578T ES91915578T ES2117644T3 ES 2117644 T3 ES2117644 T3 ES 2117644T3 ES 91915578 T ES91915578 T ES 91915578T ES 91915578 T ES91915578 T ES 91915578T ES 2117644 T3 ES2117644 T3 ES 2117644T3
- Authority
- ES
- Spain
- Prior art keywords
- signal
- echo
- error signal
- attenuation
- input signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
- H04B3/23—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other using a replica of transmitted signal in the time domain, e.g. echo cancellers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
- H04B3/23—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other using a replica of transmitted signal in the time domain, e.g. echo cancellers
- H04B3/234—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other using a replica of transmitted signal in the time domain, e.g. echo cancellers using double talk detection
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Filters And Equalizers (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Led Device Packages (AREA)
- Primary Cells (AREA)
- Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
Abstract
UN CANCELADOR DE ECO (20) CON UN PROCESADOR DE CONVOLUCIONES ADAPTATIVO (50) PARA CALCULAR Y SUSTRAER UN ECO ANTICIPADO, QUE INCLUYE UN PROCESADOR NO LINEAL (82) QUE ATENUA LA SEÑAL DE ERROR SOBRE UN RANGO CONTINUO. UNA FUENTE INSERTORA DE RUIDO (83), ACOPLADA A LA SALIDA ENVIADA INYECTA VARIABLEMENTE UNA SEÑAL ARTIFICIAL DE RUIDO EN UNA PROPORCION INVERSA A LA ATENUACION DE LA SEÑAL DE ERROR. EL AJUSTE GRADUAL DE LA ATENUACION DE LA SEÑAL DE ERROR Y EL MANTENIMIENTO DEL NIVEL DE RUIDO DE SALIDA EN EL NIVEL MEDIO DE RUIDO DE LAS ENTRADAS ANTERIORES, HACEN QUE LAS ACCIONES REALIZADAS POR EL CANCELADOR DE ECO SEAN IMPERCEPTIBLES PARA UN OYENTE AL OTRO EXTREMO.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/562,713 US5157653A (en) | 1990-08-03 | 1990-08-03 | Residual echo elimination with proportionate noise injection |
Publications (1)
Publication Number | Publication Date |
---|---|
ES2117644T3 true ES2117644T3 (es) | 1998-08-16 |
Family
ID=24247460
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ES91915578T Expired - Lifetime ES2117644T3 (es) | 1990-08-03 | 1991-07-30 | Eliminacion de eco residual. |
Country Status (13)
Country | Link |
---|---|
US (2) | US5157653A (es) |
EP (1) | EP0542882B1 (es) |
CN (1) | CN1059628A (es) |
AT (1) | ATE166755T1 (es) |
AU (1) | AU650477B2 (es) |
CA (2) | CA2139895C (es) |
DE (1) | DE69129497T2 (es) |
DK (1) | DK0542882T3 (es) |
ES (1) | ES2117644T3 (es) |
HU (1) | HUT63279A (es) |
IL (3) | IL111106A (es) |
MX (1) | MX9100478A (es) |
WO (1) | WO1992002994A1 (es) |
Families Citing this family (72)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5301057A (en) | 1990-10-15 | 1994-04-05 | Dsc Communications Corporation | Subscriber interface for a fiber optic communications terminal |
FI89756C (fi) * | 1991-11-04 | 1993-11-10 | Nokia Telecommunications Oy | Foerfarande foer olineaer signalbehandling i en ekoslaeckare |
US5477535A (en) * | 1991-11-04 | 1995-12-19 | Nokia Telecommunications Oy | Method of preventing a divergence of an adaptive echo canceller in a noisy signal environment |
US5548638A (en) * | 1992-12-21 | 1996-08-20 | Iwatsu Electric Co., Ltd. | Audio teleconferencing apparatus |
US5606581A (en) * | 1994-03-17 | 1997-02-25 | Myers; Glen A. | Method and apparatus for the cancellation of interference in electrical systems |
US5577097A (en) * | 1994-04-14 | 1996-11-19 | Northern Telecom Limited | Determining echo return loss in echo cancelling arrangements |
US5487109A (en) * | 1994-05-17 | 1996-01-23 | Bellsouth Corporation | End office of a telephone system with a zero loss plan |
KR960015851B1 (ko) * | 1994-07-12 | 1996-11-22 | 재단법인 한국전자통신연구소 | 반향 제거회로의 제어 방법(Controlling Method of Echo Canceller Circuit) |
US5461661A (en) * | 1994-07-28 | 1995-10-24 | Level One Communications, Inc. | Line disconnection detection circuit for echo-cancelling transceivers |
JPH08204619A (ja) * | 1995-01-26 | 1996-08-09 | Nec Corp | エコーサプレッサ |
US5745564A (en) * | 1995-01-26 | 1998-04-28 | Northern Telecom Limited | Echo cancelling arrangement |
US5587998A (en) * | 1995-03-03 | 1996-12-24 | At&T | Method and apparatus for reducing residual far-end echo in voice communication networks |
US5710981A (en) * | 1995-05-23 | 1998-01-20 | Ericsson Inc. | Portable radio power control device and method using incrementally degraded received signals |
US5561668A (en) * | 1995-07-06 | 1996-10-01 | Coherent Communications Systems Corp. | Echo canceler with subband attenuation and noise injection control |
US5949888A (en) * | 1995-09-15 | 1999-09-07 | Hughes Electronics Corporaton | Comfort noise generator for echo cancelers |
US5668794A (en) * | 1995-09-29 | 1997-09-16 | Crystal Semiconductor | Variable gain echo suppressor |
US5809414A (en) * | 1995-11-22 | 1998-09-15 | Northern Telecom Limited | User out-of-range indication for digital wireless systems |
SE505692C2 (sv) | 1995-12-18 | 1997-09-29 | Ericsson Telefon Ab L M | Förfarande och anordning för ekosläckning genom skattning av effekt hos residualsignal |
US5937060A (en) * | 1996-02-09 | 1999-08-10 | Texas Instruments Incorporated | Residual echo suppression |
US5848146A (en) * | 1996-05-10 | 1998-12-08 | Rane Corporation | Audio system for conferencing/presentation room |
US5856970A (en) * | 1996-08-05 | 1999-01-05 | Motorola, Inc. | Multi-channel echo cancellation method and apparatus |
US5875246A (en) * | 1996-10-29 | 1999-02-23 | Xinex Networks Inc. | Distributed audio signal processing in a network experiencing transmission delay |
US5890111A (en) * | 1996-12-24 | 1999-03-30 | Technology Research Association Of Medical Welfare Apparatus | Enhancement of esophageal speech by injection noise rejection |
US6160886A (en) * | 1996-12-31 | 2000-12-12 | Ericsson Inc. | Methods and apparatus for improved echo suppression in communications systems |
US6301357B1 (en) * | 1996-12-31 | 2001-10-09 | Ericsson Inc. | AC-center clipper for noise and echo suppression in a communications system |
US6064873A (en) * | 1997-03-26 | 2000-05-16 | Telefonaktiebolaget L M Ericsson (Publ) | Method and apparatus for controlling echo on both sides of a connection |
US6167133A (en) * | 1997-04-02 | 2000-12-26 | At&T Corporation | Echo detection, tracking, cancellation and noise fill in real time in a communication system |
US5946649A (en) * | 1997-04-16 | 1999-08-31 | Technology Research Association Of Medical Welfare Apparatus | Esophageal speech injection noise detection and rejection |
US6108412A (en) * | 1997-10-07 | 2000-08-22 | Nortel Networks Corporation | Adaptive echo cancelling system for telephony applications |
GB2330745B (en) * | 1997-10-24 | 2002-08-21 | Mitel Corp | Nonlinear processor for acoustic echo canceller |
US6198819B1 (en) * | 1997-11-14 | 2001-03-06 | Tellabs Operations, Inc. | Echo canceller having improved non-linear processor |
US6031908A (en) * | 1997-11-14 | 2000-02-29 | Tellabs Operations, Inc. | Echo canceller employing dual-H architecture having variable adaptive gain settings |
US6028929A (en) * | 1997-11-14 | 2000-02-22 | Tellabs Operations, Inc. | Echo canceller employing dual-H architecture having improved non-linear echo path detection |
US6163608A (en) * | 1998-01-09 | 2000-12-19 | Ericsson Inc. | Methods and apparatus for providing comfort noise in communications systems |
US6148078A (en) * | 1998-01-09 | 2000-11-14 | Ericsson Inc. | Methods and apparatus for controlling echo suppression in communications systems |
US6658107B1 (en) | 1998-10-23 | 2003-12-02 | Telefonaktiebolaget Lm Ericsson (Publ) | Methods and apparatus for providing echo suppression using frequency domain nonlinear processing |
JP2000252881A (ja) * | 1999-02-25 | 2000-09-14 | Mitsubishi Electric Corp | ダブルトーク検知装置並びにエコーキャンセラ装置およびエコーサプレッサー装置 |
JP2001016057A (ja) * | 1999-07-01 | 2001-01-19 | Matsushita Electric Ind Co Ltd | 音響装置 |
DE19935808A1 (de) * | 1999-07-29 | 2001-02-08 | Ericsson Telefon Ab L M | Echounterdrückungseinrichtung zum Unterdrücken von Echos in einer Sender/Empfänger-Einheit |
US6694019B1 (en) * | 1999-08-26 | 2004-02-17 | Nortel Networks Limited | Method and apparatus for infinite return loss handler for network echo canceller |
WO2001019062A1 (en) * | 1999-09-07 | 2001-03-15 | D.S.P.C. Technologies Ltd. | Suppression of residual acoustic echo |
US7050575B1 (en) | 2000-06-16 | 2006-05-23 | Ericsson Inc. | Echo canceler coefficient update apparatus and method |
US6622030B1 (en) * | 2000-06-29 | 2003-09-16 | Ericsson Inc. | Echo suppression using adaptive gain based on residual echo energy |
US6799062B1 (en) * | 2000-10-19 | 2004-09-28 | Motorola Inc. | Full-duplex hands-free transparency circuit and method therefor |
DE10119277A1 (de) * | 2001-04-20 | 2002-10-24 | Alcatel Sa | Verfahren zur Maskierung von Geräuschmodulationen und Störgeräuschen bei der Sprachübertragung |
US7154867B1 (en) * | 2001-12-06 | 2006-12-26 | At&T Corporation | Echo reduction |
AU2003233019A1 (en) * | 2002-06-19 | 2004-01-06 | Koninklijke Philips Electronics N.V. | Non stationary echo canceller |
US7016488B2 (en) * | 2002-06-24 | 2006-03-21 | Freescale Semiconductor, Inc. | Method and apparatus for non-linear processing of an audio signal |
US7242762B2 (en) | 2002-06-24 | 2007-07-10 | Freescale Semiconductor, Inc. | Monitoring and control of an adaptive filter in a communication system |
US7388954B2 (en) | 2002-06-24 | 2008-06-17 | Freescale Semiconductor, Inc. | Method and apparatus for tone indication |
US7215765B2 (en) | 2002-06-24 | 2007-05-08 | Freescale Semiconductor, Inc. | Method and apparatus for pure delay estimation in a communication system |
US7251213B2 (en) * | 2002-09-17 | 2007-07-31 | At&T Corp. | Method for remote measurement of echo path delay |
US7003099B1 (en) * | 2002-11-15 | 2006-02-21 | Fortmedia, Inc. | Small array microphone for acoustic echo cancellation and noise suppression |
US7365577B2 (en) * | 2002-11-15 | 2008-04-29 | Telebyte, Inc. | Noise waveform generator with spectrum control |
US7065207B2 (en) * | 2003-09-11 | 2006-06-20 | Freescale Semiconductor, Inc. | Controlling attenuation during echo suppression |
US8457614B2 (en) * | 2005-04-07 | 2013-06-04 | Clearone Communications, Inc. | Wireless multi-unit conference phone |
US7711107B1 (en) * | 2005-05-12 | 2010-05-04 | Mindspeed Technologies, Inc. | Perceptual masking of residual echo |
US7729657B1 (en) | 2006-04-12 | 2010-06-01 | Abel Avellan | Noise reduction system and method thereof |
US8238817B1 (en) | 2006-04-12 | 2012-08-07 | Emc Satcom Technologies, Llc | Noise reduction system and method thereof |
US8396206B2 (en) * | 2007-02-15 | 2013-03-12 | Infineon Technologies Ag | Multi-channel communication device and methods for reducing echoes by inserting a training sequence under a spectral mask |
US8213597B2 (en) * | 2007-02-15 | 2012-07-03 | Infineon Technologies Ag | Audio communication device and methods for reducing echoes by inserting a training sequence under a spectral mask |
US7809129B2 (en) * | 2007-08-31 | 2010-10-05 | Motorola, Inc. | Acoustic echo cancellation based on noise environment |
US8050398B1 (en) | 2007-10-31 | 2011-11-01 | Clearone Communications, Inc. | Adaptive conferencing pod sidetone compensator connecting to a telephonic device having intermittent sidetone |
US8199927B1 (en) | 2007-10-31 | 2012-06-12 | ClearOnce Communications, Inc. | Conferencing system implementing echo cancellation and push-to-talk microphone detection using two-stage frequency filter |
US8290141B2 (en) * | 2008-04-18 | 2012-10-16 | Freescale Semiconductor, Inc. | Techniques for comfort noise generation in a communication system |
US7522877B1 (en) | 2008-08-01 | 2009-04-21 | Emc Satcom Technologies, Inc. | Noise reduction system and method thereof |
US9065895B2 (en) * | 2012-02-22 | 2015-06-23 | Broadcom Corporation | Non-linear echo cancellation |
US8861713B2 (en) * | 2013-03-17 | 2014-10-14 | Texas Instruments Incorporated | Clipping based on cepstral distance for acoustic echo canceller |
GB201309773D0 (en) | 2013-05-31 | 2013-07-17 | Microsoft Corp | Echo removal |
GB201309771D0 (en) | 2013-05-31 | 2013-07-17 | Microsoft Corp | Echo removal |
GB201309779D0 (en) | 2013-05-31 | 2013-07-17 | Microsoft Corp | Echo removal |
GB201309777D0 (en) | 2013-05-31 | 2013-07-17 | Microsoft Corp | Echo suppression |
Family Cites Families (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3647992A (en) * | 1970-03-05 | 1972-03-07 | Bell Telephone Labor Inc | Adaptive echo canceller for nonlinear systems |
US3780233A (en) * | 1971-09-20 | 1973-12-18 | Communications Satellite Corp | Adpative echo cancellers with compandors |
US3836734A (en) * | 1971-12-03 | 1974-09-17 | Communications Satellite Corp | Adaptive echo canceller with multi-increment gain coefficient corrections |
US3894200A (en) * | 1973-10-10 | 1975-07-08 | Communications Satellite Corp | Adaptive echo canceller with digital center clipping |
US4144417A (en) * | 1975-03-07 | 1979-03-13 | Kokusai Denshin Denwa Kabushiki Kaisha | Echo cancelling system |
US4064379A (en) * | 1976-06-11 | 1977-12-20 | Communications Satellite Corporation | Logarithmic echo canceller |
US4113997A (en) * | 1977-07-12 | 1978-09-12 | Communications Satellite, Corporation | Analog to digital signal of logarithmic format converter and analog to pseudo-rms value converter and echo canceller utilizing same |
US4360712A (en) * | 1979-09-05 | 1982-11-23 | Communications Satellite Corporation | Double talk detector for echo cancellers |
US4321686A (en) * | 1980-01-24 | 1982-03-23 | Communications Satellite Corporation | Correction processor of self-adaptive filters |
US4377793A (en) * | 1981-01-13 | 1983-03-22 | Communications Satellite Corporation | Digital adaptive finite impulse response filter with large number of coefficients |
US4600815A (en) * | 1982-07-30 | 1986-07-15 | Communications Satellite Corporation | Automatic gain control for echo cancellers and similar adaptive systems |
DE3364531D1 (en) * | 1982-10-15 | 1986-08-21 | British Telecomm | Noise control circuit |
US4645883A (en) * | 1984-05-09 | 1987-02-24 | Communications Satellite Corporation | Double talk and line noise detector for a echo canceller |
US4752903A (en) * | 1985-03-25 | 1988-06-21 | Hitachi Densi Kabushiki Kaisha | Adaptive digital filter for eliminating howling |
DE3840433A1 (de) * | 1988-12-01 | 1990-06-07 | Philips Patentverwaltung | Echokompensator |
SE463589B (sv) * | 1989-04-27 | 1990-12-10 | Ericsson Telefon Ab L M | Foerfarande foer att undvika felaktig ekoeliminering och/eller utjaemning till foeljd av olinjaeriteter i en d/a-omvandlare och/eller en a/d-omvandlare i en telekommunikationsanlaeggning, samt anordning foer utoevande av foerfarandet i samband med d/a-omvandling och anordning foer utoevande av foerfarandet i samband med a/d-omvandling |
GB2245459A (en) * | 1990-06-20 | 1992-01-02 | Motorola Inc | Echo canceller with adaptive voice switch attenuation |
-
1990
- 1990-08-03 US US07/562,713 patent/US5157653A/en not_active Expired - Lifetime
-
1991
- 1991-07-25 IL IL11110691A patent/IL111106A/en not_active IP Right Cessation
- 1991-07-25 IL IL9896391A patent/IL98963A/en not_active IP Right Cessation
- 1991-07-30 CA CA002139895A patent/CA2139895C/en not_active Expired - Lifetime
- 1991-07-30 ES ES91915578T patent/ES2117644T3/es not_active Expired - Lifetime
- 1991-07-30 DK DK91915578T patent/DK0542882T3/da active
- 1991-07-30 EP EP91915578A patent/EP0542882B1/en not_active Expired - Lifetime
- 1991-07-30 CA CA002088684A patent/CA2088684C/en not_active Expired - Lifetime
- 1991-07-30 AT AT91915578T patent/ATE166755T1/de not_active IP Right Cessation
- 1991-07-30 DE DE69129497T patent/DE69129497T2/de not_active Expired - Fee Related
- 1991-07-30 HU HU93262A patent/HUT63279A/hu unknown
- 1991-07-30 AU AU84352/91A patent/AU650477B2/en not_active Ceased
- 1991-07-30 WO PCT/US1991/005383 patent/WO1992002994A1/en active IP Right Grant
- 1991-08-01 MX MX9100478A patent/MX9100478A/es unknown
- 1991-08-02 CN CN91108560.2A patent/CN1059628A/zh active Pending
-
1992
- 1992-07-30 US US07/922,990 patent/US5283784A/en not_active Expired - Lifetime
-
1994
- 1994-09-29 IL IL11110694A patent/IL111106A0/xx unknown
Also Published As
Publication number | Publication date |
---|---|
MX9100478A (es) | 1992-08-10 |
US5157653A (en) | 1992-10-20 |
DK0542882T3 (da) | 1999-03-22 |
HU9300262D0 (en) | 1993-06-28 |
IL98963A0 (en) | 1992-07-15 |
DE69129497D1 (en) | 1998-07-02 |
IL111106A0 (en) | 1994-11-28 |
WO1992002994A1 (en) | 1992-02-20 |
ATE166755T1 (de) | 1998-06-15 |
IL111106A (en) | 1995-10-31 |
EP0542882A4 (en) | 1993-08-11 |
EP0542882A1 (en) | 1993-05-26 |
CA2139895A1 (en) | 1992-02-04 |
HUT63279A (en) | 1993-07-28 |
AU650477B2 (en) | 1994-06-23 |
CA2088684C (en) | 1995-04-11 |
CA2088684A1 (en) | 1992-02-04 |
EP0542882B1 (en) | 1998-05-27 |
AU8435291A (en) | 1992-03-02 |
CA2139895C (en) | 1999-07-13 |
DE69129497T2 (de) | 1998-11-05 |
IL98963A (en) | 1995-01-24 |
CN1059628A (zh) | 1992-03-18 |
US5283784A (en) | 1994-02-01 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
FG2A | Definitive protection |
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