DK0542882T3 - Restekkoeliminering - Google Patents
RestekkoelimineringInfo
- Publication number
- DK0542882T3 DK0542882T3 DK91915578T DK91915578T DK0542882T3 DK 0542882 T3 DK0542882 T3 DK 0542882T3 DK 91915578 T DK91915578 T DK 91915578T DK 91915578 T DK91915578 T DK 91915578T DK 0542882 T3 DK0542882 T3 DK 0542882T3
- Authority
- DK
- Denmark
- Prior art keywords
- signal
- echo
- error signal
- attenuation
- residual echo
- Prior art date
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)
- Primary Cells (AREA)
- Led Device Packages (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
Applications Claiming Priority (2)
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 |
PCT/US1991/005383 WO1992002994A1 (en) | 1990-08-03 | 1991-07-30 | Residual echo elimination with proportionate noise injection |
Publications (1)
Publication Number | Publication Date |
---|---|
DK0542882T3 true DK0542882T3 (da) | 1999-03-22 |
Family
ID=24247460
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DK91915578T DK0542882T3 (da) | 1990-08-03 | 1991-07-30 | Restekkoeliminering |
Country Status (13)
Country | Link |
---|---|
US (2) | US5157653A (da) |
EP (1) | EP0542882B1 (da) |
CN (1) | CN1059628A (da) |
AT (1) | ATE166755T1 (da) |
AU (1) | AU650477B2 (da) |
CA (2) | CA2139895C (da) |
DE (1) | DE69129497T2 (da) |
DK (1) | DK0542882T3 (da) |
ES (1) | ES2117644T3 (da) |
HU (1) | HUT63279A (da) |
IL (3) | IL111106A (da) |
MX (1) | MX9100478A (da) |
WO (1) | WO1992002994A1 (da) |
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 |
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 |
ES2117644T3 (es) | 1998-08-16 |
US5283784A (en) | 1994-02-01 |
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