BR9713754A - Detector e processo para detecção de conversa dupla e de variação de trajeto de eco. - Google Patents
Detector e processo para detecção de conversa dupla e de variação de trajeto de eco.Info
- Publication number
- BR9713754A BR9713754A BR9713754-5A BR9713754A BR9713754A BR 9713754 A BR9713754 A BR 9713754A BR 9713754 A BR9713754 A BR 9713754A BR 9713754 A BR9713754 A BR 9713754A
- Authority
- BR
- Brazil
- Prior art keywords
- echo
- signal
- detector
- residual signal
- double talk
- 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
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
"DETECTOR E PROCESSO PARA DETECçãO DE CONVERSA DUPLA E DE VARIAçãO DE TRAJETO DE ECO". Um detector de conversa dupla e de variação de trajeto de eco (100) é provido para o uso em um cancelador de eco (10) que faz uma determinação acerca de se um sinal residual é dominado pelo eco ou por um sinal de "final próximo". Para realizar esta determinação, uma primeira medição de dependência linear é computada entre o sinal residual e uma estimativa de eco, e uma segunda medição de dependência linear é computada entre o sinal residual e um sinal desejado. Os dois resultados são comparados um com o outro, e, se eles forem aproximadamente da mesma ordem, não é necessária ação ulterior. Se a comparação determinar que a dependência entre o sinal residual e o sinal desejado é muito mais forte do que a dependência entre o sinal residual e a estimativa de eco, o presente detector (100) assume que foi detectada conversa dupla e um sinal designando que resultado é emitido. Por outro lado, se a dependência entre o sinal residual e o sinal desejado é muito mais fraca do que a dependência entre o sinal residual e a estimativa de eco, o detector (100) assume que não foi detectada uma variação de trajeto de eco e um sinal designando este resultado é emitido. Como tal, um processo e aparelho confiáveis e computacionalmente efetivos são providos para fornecer ao cancelador de eco (10) informação útil acerca de conversa dupla e variações de trajeto de eco que ocorreram.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/770,908 US6035034A (en) | 1996-12-20 | 1996-12-20 | Double talk and echo path change detection in a telephony system |
PCT/SE1997/002076 WO1998028857A1 (en) | 1996-12-20 | 1997-12-12 | Double talk and echo path change detection in a telephony system |
Publications (1)
Publication Number | Publication Date |
---|---|
BR9713754A true BR9713754A (pt) | 2000-02-01 |
Family
ID=25090083
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
BR9713754-5A BR9713754A (pt) | 1996-12-20 | 1997-12-12 | Detector e processo para detecção de conversa dupla e de variação de trajeto de eco. |
Country Status (12)
Country | Link |
---|---|
US (1) | US6035034A (pt) |
EP (1) | EP0947057B1 (pt) |
JP (1) | JP4205169B2 (pt) |
CN (1) | CN1127813C (pt) |
AU (1) | AU5351698A (pt) |
BR (1) | BR9713754A (pt) |
CA (1) | CA2275662C (pt) |
DE (1) | DE69732917T2 (pt) |
MY (1) | MY118091A (pt) |
PL (1) | PL186221B1 (pt) |
TR (1) | TR199901384T2 (pt) |
WO (1) | WO1998028857A1 (pt) |
Families Citing this family (42)
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DE19805942C1 (de) * | 1998-02-13 | 1999-08-12 | Siemens Ag | Verfahren zur Verbesserung der akustischen Rückhördämpfung in Freisprecheinrichtungen |
JP3267556B2 (ja) * | 1998-02-18 | 2002-03-18 | 沖電気工業株式会社 | エコー除去装置および送話器 |
US6226380B1 (en) * | 1998-02-19 | 2001-05-01 | Nortel Networks Limited | Method of distinguishing between echo path change and double talk conditions in an echo canceller |
US7423983B1 (en) * | 1999-09-20 | 2008-09-09 | Broadcom Corporation | Voice and data exchange over a packet based network |
US7920697B2 (en) * | 1999-12-09 | 2011-04-05 | Broadcom Corp. | Interaction between echo canceller and packet voice processing |
TW461191B (en) * | 2000-02-25 | 2001-10-21 | Winbond Electronics Corp | Method to cancel echo |
GB2371191B (en) * | 2001-01-11 | 2005-06-15 | Mitel Corp | Double-talk and path change detection using a matrix of correlation coefficients |
US6895086B2 (en) * | 2001-11-13 | 2005-05-17 | Inmate Telephone, Inc. | 3-Way call detection system and method |
US20030185402A1 (en) * | 2002-03-27 | 2003-10-02 | Lucent Technologies, Inc. | Adaptive distortion manager for use with an acoustic echo canceler and a method of operation thereof |
US7359504B1 (en) * | 2002-12-03 | 2008-04-15 | Plantronics, Inc. | Method and apparatus for reducing echo and noise |
AU2004303075B2 (en) * | 2003-08-05 | 2009-06-25 | Dsi-Iti, Llc | Three-way call detection using steganography |
GB0402102D0 (en) | 2004-01-30 | 2004-03-03 | Mitel Networks Corp | Method for detecting echo path changes in echo cancellers |
US7555117B2 (en) * | 2005-07-12 | 2009-06-30 | Acoustic Technologies, Inc. | Path change detector for echo cancellation |
US8275120B2 (en) * | 2006-05-30 | 2012-09-25 | Microsoft Corp. | Adaptive acoustic echo cancellation |
US7817797B2 (en) * | 2006-06-07 | 2010-10-19 | Mitel Networks Corporation | Method and apparatus for detecting echo path changes in an acoustic echo canceller |
US7853214B2 (en) * | 2007-01-05 | 2010-12-14 | Microtune (Texas), L.P. | Dynamic multi-path detection device and method |
US8219872B2 (en) * | 2007-01-05 | 2012-07-10 | Csr Technology Inc. | Extended deinterleaver for an iterative decoder |
US20080201158A1 (en) | 2007-02-15 | 2008-08-21 | Johnson Mark D | System and method for visitation management in a controlled-access environment |
US8542802B2 (en) * | 2007-02-15 | 2013-09-24 | Global Tel*Link Corporation | System and method for three-way call detection |
US8411846B2 (en) * | 2008-05-09 | 2013-04-02 | Agere Systems Llc | Echo path change detection in telecommunications networks |
US8295474B2 (en) * | 2008-08-08 | 2012-10-23 | Freescale Semiconductor, Inc. | Echo canceller with heavy double-talk estimation |
CN102224710B (zh) * | 2008-09-15 | 2014-08-20 | 卓然公司 | 动态多路径检测设备 |
US9225838B2 (en) | 2009-02-12 | 2015-12-29 | Value-Added Communications, Inc. | System and method for detecting three-way call circumvention attempts |
US8630726B2 (en) * | 2009-02-12 | 2014-01-14 | Value-Added Communications, Inc. | System and method for detecting three-way call circumvention attempts |
CN103179296B (zh) * | 2011-12-26 | 2017-02-15 | 中兴通讯股份有限公司 | 一种回波抵消器及回波抵消方法 |
EP2613566B1 (en) * | 2012-01-03 | 2016-07-20 | Oticon A/S | A listening device and a method of monitoring the fitting of an ear mould of a listening device |
CN104050971A (zh) | 2013-03-15 | 2014-09-17 | 杜比实验室特许公司 | 声学回声减轻装置和方法、音频处理装置和语音通信终端 |
GB2515592B (en) | 2013-12-23 | 2016-11-30 | Imagination Tech Ltd | Echo path change detector |
WO2017053490A1 (en) * | 2015-09-25 | 2017-03-30 | Microsemi Semiconductor (U.S.) Inc. | Acoustic echo path change detection apparatus and method |
CN105791611B (zh) * | 2016-02-22 | 2020-07-07 | 腾讯科技(深圳)有限公司 | 回声消除方法、装置、终端以及存储介质 |
US10572961B2 (en) | 2016-03-15 | 2020-02-25 | Global Tel*Link Corporation | Detection and prevention of inmate to inmate message relay |
US9609121B1 (en) | 2016-04-07 | 2017-03-28 | Global Tel*Link Corporation | System and method for third party monitoring of voice and video calls |
US10027797B1 (en) | 2017-05-10 | 2018-07-17 | Global Tel*Link Corporation | Alarm control for inmate call monitoring |
US10225396B2 (en) | 2017-05-18 | 2019-03-05 | Global Tel*Link Corporation | Third party monitoring of a activity within a monitoring platform |
US10860786B2 (en) | 2017-06-01 | 2020-12-08 | Global Tel*Link Corporation | System and method for analyzing and investigating communication data from a controlled environment |
US9930088B1 (en) | 2017-06-22 | 2018-03-27 | Global Tel*Link Corporation | Utilizing VoIP codec negotiation during a controlled environment call |
JP7054668B2 (ja) | 2018-11-08 | 2022-04-14 | 株式会社日立製作所 | 動的生産計画システムおよび動的生産計画装置 |
US10827076B1 (en) | 2020-03-11 | 2020-11-03 | Cirrus Logic, Inc. | Echo path change monitoring in an acoustic echo canceler |
US11586407B2 (en) | 2020-06-09 | 2023-02-21 | Meta Platforms Technologies, Llc | Systems, devices, and methods of manipulating audio data based on display orientation |
US11620976B2 (en) * | 2020-06-09 | 2023-04-04 | Meta Platforms Technologies, Llc | Systems, devices, and methods of acoustic echo cancellation based on display orientation |
US11340861B2 (en) | 2020-06-09 | 2022-05-24 | Facebook Technologies, Llc | Systems, devices, and methods of manipulating audio data based on microphone orientation |
CN111970610B (zh) * | 2020-08-26 | 2022-05-20 | 展讯通信(上海)有限公司 | 回声路径检测方法、音频信号处理方法及系统、存储介质、终端 |
Family Cites Families (13)
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US4282411A (en) * | 1979-06-04 | 1981-08-04 | Tellabs, Inc. | Residual echo suppressor for echo canceller |
US4360712A (en) * | 1979-09-05 | 1982-11-23 | Communications Satellite Corporation | Double talk detector for echo cancellers |
JPS6053336A (ja) * | 1983-09-02 | 1985-03-27 | Nec Corp | 反響消去装置 |
US4918727A (en) * | 1988-06-09 | 1990-04-17 | Tellabs Incorporated | Double talk detector for echo canceller and method |
JP2595090B2 (ja) * | 1989-04-19 | 1997-03-26 | 株式会社日立製作所 | 試験機能付エコーキャンセラ及び該エコーキャンセラを有する通信機器 |
JPH03159423A (ja) * | 1989-11-17 | 1991-07-09 | Fujitsu Ltd | エコーキャンセラにおけるダブルトーク検出方式 |
JP2518433B2 (ja) * | 1990-01-24 | 1996-07-24 | 日本電気株式会社 | ダブルト―ク検出回路 |
NL9002790A (nl) * | 1990-12-18 | 1992-07-16 | Philips Nv | Echocompensator met verbeterde dubbelspraak detectie. |
JP2836277B2 (ja) * | 1991-03-14 | 1998-12-14 | 国際電信電話株式会社 | エコーキャンセル装置 |
JP2538176B2 (ja) * | 1993-05-28 | 1996-09-25 | 松下電器産業株式会社 | エコ―制御装置 |
JPH07288493A (ja) * | 1994-04-18 | 1995-10-31 | Fujitsu Ltd | ダブルトーク検出装置 |
JP3395388B2 (ja) * | 1994-08-16 | 2003-04-14 | ソニー株式会社 | 信号適応処理装置及びエコー抑圧装置 |
US5657384A (en) * | 1995-03-10 | 1997-08-12 | Tandy Corporation | Full duplex speakerphone |
-
1996
- 1996-12-20 US US08/770,908 patent/US6035034A/en not_active Expired - Lifetime
-
1997
- 1997-12-09 MY MYPI97005917A patent/MY118091A/en unknown
- 1997-12-12 JP JP52867498A patent/JP4205169B2/ja not_active Expired - Lifetime
- 1997-12-12 BR BR9713754-5A patent/BR9713754A/pt not_active Application Discontinuation
- 1997-12-12 EP EP97950543A patent/EP0947057B1/en not_active Expired - Lifetime
- 1997-12-12 CA CA002275662A patent/CA2275662C/en not_active Expired - Lifetime
- 1997-12-12 DE DE69732917T patent/DE69732917T2/de not_active Expired - Lifetime
- 1997-12-12 WO PCT/SE1997/002076 patent/WO1998028857A1/en active IP Right Grant
- 1997-12-12 CN CN97181911.4A patent/CN1127813C/zh not_active Expired - Fee Related
- 1997-12-12 AU AU53516/98A patent/AU5351698A/en not_active Abandoned
- 1997-12-12 TR TR1999/01384T patent/TR199901384T2/xx unknown
- 1997-12-12 PL PL97334048A patent/PL186221B1/pl unknown
Also Published As
Publication number | Publication date |
---|---|
CA2275662C (en) | 2006-06-13 |
WO1998028857A1 (en) | 1998-07-02 |
MY118091A (en) | 2004-08-30 |
EP0947057B1 (en) | 2005-03-30 |
JP4205169B2 (ja) | 2009-01-07 |
US6035034A (en) | 2000-03-07 |
PL186221B1 (pl) | 2003-11-28 |
DE69732917D1 (de) | 2005-05-04 |
JP2001508609A (ja) | 2001-06-26 |
CA2275662A1 (en) | 1998-07-02 |
AU5351698A (en) | 1998-07-17 |
TR199901384T2 (xx) | 1999-09-21 |
CN1247652A (zh) | 2000-03-15 |
CN1127813C (zh) | 2003-11-12 |
PL334048A1 (en) | 2000-01-31 |
DE69732917T2 (de) | 2006-04-13 |
EP0947057A1 (en) | 1999-10-06 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
B06A | Patent application procedure suspended [chapter 6.1 patent gazette] | ||
B11B | Dismissal acc. art. 36, par 1 of ipl - no reply within 90 days to fullfil the necessary requirements |