MX9800175A - Compensacion de ruido espectral para cancelacion de eco. - Google Patents
Compensacion de ruido espectral para cancelacion de eco.Info
- Publication number
- MX9800175A MX9800175A MX9800175A MX9800175A MX9800175A MX 9800175 A MX9800175 A MX 9800175A MX 9800175 A MX9800175 A MX 9800175A MX 9800175 A MX9800175 A MX 9800175A MX 9800175 A MX9800175 A MX 9800175A
- Authority
- MX
- Mexico
- Prior art keywords
- signals
- subband
- send
- input signal
- receive
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
- H04M9/082—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic using 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
- H04B3/21—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other using a set of bandfilters
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Optical Communication System (AREA)
Abstract
Un cancelador de eco (10) incluye un banco de filtro de análisis (24) para dividir una señal de entrada de envío (SI) y una señal de entrada de recepcion (RI) en señales de entrada de envío sub-banda (SCI-SC16) y señales de recepcion sub-banda (RCI-RC16). Cada una de las señales de recepcion sub-banda (RCI-RC16) forma espiras con una funcion de respuesta de impulso que pertenece a la trayectoria de eco, que acopla a la señal de recepcion con la señal de entrada de envío dentro de cada sub-banda, dando señales de eco estimadas (EC1-EC16), que después se substrae de la señal de entrada de envío sub-banda correspondiente para producir señales de error (ER1-ER16). Los componentes de eco residuales dentro de las señales de error se atenuan por un atenuador variable señal de error atenuada para compensar la atenuacion del ruido de fondo incidental a la atenuacion variable de las señales de error.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/498,632 US5561668A (en) | 1995-07-06 | 1995-07-06 | Echo canceler with subband attenuation and noise injection control |
Publications (1)
Publication Number | Publication Date |
---|---|
MX9800175A true MX9800175A (es) | 1998-11-29 |
Family
ID=23981871
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
MX9800175A MX9800175A (es) | 1995-07-06 | 1998-01-07 | Compensacion de ruido espectral para cancelacion de eco. |
Country Status (8)
Country | Link |
---|---|
US (2) | US5561668A (es) |
EP (1) | EP0872028A4 (es) |
JP (1) | JP2000502520A (es) |
CN (1) | CN1092870C (es) |
AU (1) | AU697941B2 (es) |
CA (1) | CA2226083C (es) |
MX (1) | MX9800175A (es) |
WO (1) | WO1997002664A1 (es) |
Families Citing this family (63)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU702796B2 (en) * | 1995-07-06 | 1999-03-04 | Tellabs Operations, Inc. | Spectral noise compensation for telecommunication signal processing |
US5561668A (en) * | 1995-07-06 | 1996-10-01 | Coherent Communications Systems Corp. | Echo canceler with subband attenuation and noise injection control |
US6125179A (en) * | 1995-12-13 | 2000-09-26 | 3Com Corporation | Echo control device with quick response to sudden echo-path change |
US5825754A (en) * | 1995-12-28 | 1998-10-20 | Vtel Corporation | Filter and process for reducing noise in audio signals |
FI106489B (fi) * | 1996-06-19 | 2001-02-15 | Nokia Networks Oy | Kaikusalpa ja kaiunpoistajan epälineaarinen prosessori |
JP3099870B2 (ja) * | 1996-07-23 | 2000-10-16 | 日本電気株式会社 | 音響エコーキャンセラ |
DE19639702C2 (de) * | 1996-09-26 | 2000-11-16 | Siemens Ag | Verfahren und Anordnung zur Begrenzung des Restechos |
KR100339168B1 (ko) * | 1996-11-07 | 2002-06-03 | 모리시타 요이찌 | 음원 벡터 생성 장치, 음성 부호화 장치 및 음성 복호화장치 |
US6192087B1 (en) | 1996-11-15 | 2001-02-20 | Conexant Systems, Inc. | Method and apparatus for spectral shaping in signal-point limited transmission systems |
US6278744B1 (en) | 1996-11-15 | 2001-08-21 | Conexant Systems, Inc. | System for controlling and shaping the spectrum and redundancy of signal-point limited transmission |
US6160886A (en) * | 1996-12-31 | 2000-12-12 | Ericsson Inc. | Methods and apparatus for improved echo suppression in communications systems |
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 |
US5970154A (en) * | 1997-06-16 | 1999-10-19 | Industrial Technology Research Institute | Apparatus and method for echo cancellation |
GB2343801B (en) * | 1997-08-21 | 2001-09-12 | Data Fusion Corp | Method and apparatus for acquiring wide-band pseudorandom noise encoded waveforms |
GB2330745B (en) * | 1997-10-24 | 2002-08-21 | Mitel Corp | Nonlinear processor for acoustic echo canceller |
US6108343A (en) * | 1997-12-19 | 2000-08-22 | Nortel Networks Corporation | Dynamically reconfigurable DSP architecture for multi-channel telephony |
US6091813A (en) * | 1998-06-23 | 2000-07-18 | Noise Cancellation Technologies, Inc. | Acoustic echo canceller |
US6442275B1 (en) * | 1998-09-17 | 2002-08-27 | Lucent Technologies Inc. | Echo canceler including subband echo suppressor |
US6658107B1 (en) * | 1998-10-23 | 2003-12-02 | Telefonaktiebolaget Lm Ericsson (Publ) | Methods and apparatus for providing echo suppression using frequency domain nonlinear processing |
EP0999708A1 (en) * | 1998-11-06 | 2000-05-10 | TELEFONAKTIEBOLAGET L M ERICSSON (publ) | Channel error correction apparatus and method |
US6560332B1 (en) | 1999-05-18 | 2003-05-06 | Telefonaktiebolaget Lm Ericsson (Publ) | Methods and apparatus for improving echo suppression in bi-directional communications systems |
US6798881B2 (en) * | 1999-06-07 | 2004-09-28 | Acoustic Technologies, Inc. | Noise reduction circuit for telephones |
DE19935808A1 (de) * | 1999-07-29 | 2001-02-08 | Ericsson Telefon Ab L M | Echounterdrückungseinrichtung zum Unterdrücken von Echos in einer Sender/Empfänger-Einheit |
WO2001033814A1 (en) * | 1999-11-03 | 2001-05-10 | Tellabs Operations, Inc. | Integrated voice processing system for packet networks |
FR2802375B1 (fr) * | 1999-12-09 | 2002-09-20 | France Telecom | Dispositif de traitement de l'echo dans un systeme de communication au niveau d'un terminal |
US6963642B1 (en) * | 1999-12-30 | 2005-11-08 | Acoustic Technology, Inc. | Band-by-band full duplex communication |
US6765971B1 (en) * | 2000-08-08 | 2004-07-20 | Hughes Electronics Corp. | System method and computer program product for improved narrow band signal detection for echo cancellation |
DE10055643A1 (de) * | 2000-11-10 | 2002-05-29 | Siemens Ag | Verfahren zum Ermitteln von Einstellparameter einer Empfangseinheit, zugehörige Einheiten und zugehöriges Programm |
KR100477638B1 (ko) * | 2001-09-11 | 2005-03-23 | 삼성전자주식회사 | 2d/3d 겸용 디스플레이 |
JP3568922B2 (ja) * | 2001-09-20 | 2004-09-22 | 三菱電機株式会社 | エコー処理装置 |
FR2834563B1 (fr) * | 2002-01-08 | 2004-04-02 | Thales Sa | Procede de suppression de signaux radioelectriques pulses et dispositif de mise en oeuvre du procede |
US7177416B1 (en) * | 2002-04-27 | 2007-02-13 | Fortemedia, Inc. | Channel control and post filter for acoustic echo cancellation |
US6904146B2 (en) * | 2002-05-03 | 2005-06-07 | Acoustic Technology, Inc. | Full duplex echo cancelling circuit |
US7242762B2 (en) * | 2002-06-24 | 2007-07-10 | Freescale Semiconductor, Inc. | Monitoring and control of an adaptive filter in a communication system |
US7016488B2 (en) * | 2002-06-24 | 2006-03-21 | Freescale Semiconductor, Inc. | Method and apparatus for non-linear processing of an audio signal |
US7388954B2 (en) * | 2002-06-24 | 2008-06-17 | Freescale Semiconductor, Inc. | Method and apparatus for tone indication |
US6961423B2 (en) | 2002-06-24 | 2005-11-01 | Freescale Semiconductor, Inc. | Method and apparatus for performing adaptive filtering |
US7215765B2 (en) * | 2002-06-24 | 2007-05-08 | Freescale Semiconductor, Inc. | Method and apparatus for pure delay estimation in a communication system |
JP4161628B2 (ja) | 2002-07-19 | 2008-10-08 | 日本電気株式会社 | エコー抑圧方法及び装置 |
US7443978B2 (en) | 2003-09-04 | 2008-10-28 | Kabushiki Kaisha Toshiba | Method and apparatus for audio coding with noise suppression |
WO2005046076A1 (ja) * | 2003-11-11 | 2005-05-19 | Mitsubishi Denki Kabushiki Kaisha | エコー抑圧装置 |
CN1295678C (zh) * | 2004-05-18 | 2007-01-17 | 中国科学院声学研究所 | 子带自适应谷点降噪***和方法 |
CN100444695C (zh) * | 2004-12-31 | 2008-12-17 | 北京中星微电子有限公司 | 一种实现串音消除的方法及滤波器生成装置和播放装置 |
US7724693B2 (en) * | 2005-07-28 | 2010-05-25 | Qnx Software Systems (Wavemakers), Inc. | Network dependent signal processing |
US7764783B1 (en) * | 2005-08-15 | 2010-07-27 | Fortemedia, Inc. | Acoustic echo cancellation with oversampling |
US8326614B2 (en) | 2005-09-02 | 2012-12-04 | Qnx Software Systems Limited | Speech enhancement system |
US7876996B1 (en) | 2005-12-15 | 2011-01-25 | Nvidia Corporation | Method and system for time-shifting video |
US8738382B1 (en) * | 2005-12-16 | 2014-05-27 | Nvidia Corporation | Audio feedback time shift filter system and method |
US8295475B2 (en) * | 2006-01-13 | 2012-10-23 | Microsoft Corporation | Selective glitch detection, clock drift compensation, and anti-clipping in audio echo cancellation |
US7831035B2 (en) * | 2006-04-28 | 2010-11-09 | Microsoft Corporation | Integration of a microphone array with acoustic echo cancellation and center clipping |
US7773743B2 (en) * | 2006-04-28 | 2010-08-10 | Microsoft Corporation | Integration of a microphone array with acoustic echo cancellation and residual echo suppression |
WO2009047858A1 (ja) * | 2007-10-12 | 2009-04-16 | Fujitsu Limited | エコー抑圧システム、エコー抑圧方法、エコー抑圧プログラム、エコー抑圧装置、音出力装置、オーディオシステム、ナビゲーションシステム及び移動体 |
US8208621B1 (en) | 2007-10-12 | 2012-06-26 | Mediatek Inc. | Systems and methods for acoustic echo cancellation |
US8433061B2 (en) * | 2007-12-10 | 2013-04-30 | Microsoft Corporation | Reducing echo |
US8219387B2 (en) * | 2007-12-10 | 2012-07-10 | Microsoft Corporation | Identifying far-end sound |
US8744069B2 (en) * | 2007-12-10 | 2014-06-03 | Microsoft Corporation | Removing near-end frequencies from far-end sound |
US8380253B2 (en) | 2008-02-15 | 2013-02-19 | Microsoft Corporation | Voice switching for voice communication on computers |
JP4631933B2 (ja) * | 2008-05-30 | 2011-02-16 | 日本電気株式会社 | エコー抑圧方法 |
US8369251B2 (en) * | 2008-06-20 | 2013-02-05 | Microsoft Corporation | Timestamp quality assessment for assuring acoustic echo canceller operability |
US20100304679A1 (en) * | 2009-05-28 | 2010-12-02 | Hanks Zeng | Method and System For Echo Estimation and Cancellation |
CN103677090A (zh) | 2012-09-10 | 2014-03-26 | 康准电子科技(昆山)有限公司 | 电子设备 |
CN107705799B (zh) * | 2017-11-24 | 2020-12-11 | 苏州狗尾草智能科技有限公司 | 聊天机器人回声消除方法及装置 |
US10951859B2 (en) | 2018-05-30 | 2021-03-16 | Microsoft Technology Licensing, Llc | Videoconferencing device and method |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4644108A (en) * | 1982-10-27 | 1987-02-17 | International Business Machines Corporation | Adaptive sub-band echo suppressor |
FR2628918B1 (fr) * | 1988-03-15 | 1990-08-10 | France Etat | Dispositif annuleur d'echo a filtrage en sous-bandes de frequence |
US5285165A (en) * | 1988-05-26 | 1994-02-08 | Renfors Markku K | Noise elimination method |
US5001701A (en) * | 1989-08-07 | 1991-03-19 | At&T Bell Laboratories | Subband echo canceler including real time allocation among the subbands |
CA2036078C (en) * | 1990-02-21 | 1994-07-26 | Fumio Amano | Sub-band acoustic echo canceller |
US5157653A (en) * | 1990-08-03 | 1992-10-20 | Coherent Communications Systems Corp. | Residual echo elimination with proportionate noise injection |
JP2503747B2 (ja) * | 1990-09-12 | 1996-06-05 | 日本電気株式会社 | Fir形エコ―キャンセラ |
JPH04123621A (ja) * | 1990-09-14 | 1992-04-23 | Nippon Telegr & Teleph Corp <Ntt> | 反響消去装置 |
US5305307A (en) * | 1991-01-04 | 1994-04-19 | Picturetel Corporation | Adaptive acoustic echo canceller having means for reducing or eliminating echo in a plurality of signal bandwidths |
US5274705A (en) * | 1991-09-24 | 1993-12-28 | Tellabs Inc. | Nonlinear processor for an echo canceller and method |
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 |
JP2853455B2 (ja) * | 1992-05-15 | 1999-02-03 | ケイディディ株式会社 | エコーキャンセラ |
US5365583A (en) * | 1992-07-02 | 1994-11-15 | Polycom, Inc. | Method for fail-safe operation in a speaker phone system |
US5477534A (en) * | 1993-07-30 | 1995-12-19 | Kyocera Corporation | Acoustic echo canceller |
US5561668A (en) * | 1995-07-06 | 1996-10-01 | Coherent Communications Systems Corp. | Echo canceler with subband attenuation and noise injection control |
-
1995
- 1995-07-06 US US08/498,632 patent/US5561668A/en not_active Expired - Lifetime
-
1996
- 1996-07-01 US US08/674,324 patent/US5721730A/en not_active Expired - Lifetime
- 1996-07-03 AU AU64515/96A patent/AU697941B2/en not_active Ceased
- 1996-07-03 JP JP9505297A patent/JP2000502520A/ja active Pending
- 1996-07-03 WO PCT/US1996/011271 patent/WO1997002664A1/en not_active Application Discontinuation
- 1996-07-03 CN CN96196559A patent/CN1092870C/zh not_active Expired - Fee Related
- 1996-07-03 CA CA002226083A patent/CA2226083C/en not_active Expired - Lifetime
- 1996-07-03 EP EP96923639A patent/EP0872028A4/en not_active Withdrawn
-
1998
- 1998-01-07 MX MX9800175A patent/MX9800175A/es unknown
Also Published As
Publication number | Publication date |
---|---|
CN1194068A (zh) | 1998-09-23 |
US5561668A (en) | 1996-10-01 |
CA2226083C (en) | 2008-12-16 |
CN1092870C (zh) | 2002-10-16 |
CA2226083A1 (en) | 1997-01-23 |
EP0872028A1 (en) | 1998-10-21 |
AU697941B2 (en) | 1998-10-22 |
US5721730A (en) | 1998-02-24 |
JP2000502520A (ja) | 2000-02-29 |
AU6451596A (en) | 1997-02-05 |
WO1997002664A1 (en) | 1997-01-23 |
EP0872028A4 (en) | 1999-07-28 |
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