DE69412290D1 - Bestimmung der echodämpfung einer echokompensationseinrichtung - Google Patents

Bestimmung der echodämpfung einer echokompensationseinrichtung

Info

Publication number
DE69412290D1
DE69412290D1 DE69412290T DE69412290T DE69412290D1 DE 69412290 D1 DE69412290 D1 DE 69412290D1 DE 69412290 T DE69412290 T DE 69412290T DE 69412290 T DE69412290 T DE 69412290T DE 69412290 D1 DE69412290 D1 DE 69412290D1
Authority
DE
Germany
Prior art keywords
echocompensation
determination
echo damping
echo
damping
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 - Fee Related
Application number
DE69412290T
Other languages
English (en)
Other versions
DE69412290T2 (de
Inventor
Quentin Meek
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nortel Networks Ltd
Original Assignee
Northern Telecom Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Northern Telecom Ltd filed Critical Northern Telecom Ltd
Application granted granted Critical
Publication of DE69412290D1 publication Critical patent/DE69412290D1/de
Publication of DE69412290T2 publication Critical patent/DE69412290T2/de
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
DE69412290T 1994-04-14 1994-06-15 Bestimmung der echodämpfung einer echokompensationseinrichtung Expired - Fee Related DE69412290T2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/227,819 US5577097A (en) 1994-04-14 1994-04-14 Determining echo return loss in echo cancelling arrangements
PCT/CA1994/000330 WO1995028774A1 (en) 1994-04-14 1994-06-15 Determining echo return loss in echo cancelling arrangements

Publications (2)

Publication Number Publication Date
DE69412290D1 true DE69412290D1 (de) 1998-09-10
DE69412290T2 DE69412290T2 (de) 1998-12-03

Family

ID=22854598

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69412290T Expired - Fee Related DE69412290T2 (de) 1994-04-14 1994-06-15 Bestimmung der echodämpfung einer echokompensationseinrichtung

Country Status (6)

Country Link
US (1) US5577097A (de)
EP (1) EP0755591B1 (de)
JP (1) JP2949601B2 (de)
CA (1) CA2146393C (de)
DE (1) DE69412290T2 (de)
WO (1) WO1995028774A1 (de)

Families Citing this family (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IL115892A (en) * 1994-11-10 1999-05-09 British Telecomm Interference detection system for telecommunications
US5745564A (en) * 1995-01-26 1998-04-28 Northern Telecom Limited Echo cancelling arrangement
DE69612480T2 (de) * 1995-02-15 2001-10-11 British Telecommunications P.L.C., London Detektion von sprechaktivität
US5668865A (en) * 1996-02-26 1997-09-16 Lucent Technologies Inc. Echo canceler E-side speech detector
JP2918025B2 (ja) * 1996-04-24 1999-07-12 日本電気株式会社 ２線式音声会議装置
TW432855B (en) * 1996-04-25 2001-05-01 Mitsubishi Electric Corp Echo eliminator
US5765130A (en) * 1996-05-21 1998-06-09 Applied Language Technologies, Inc. Method and apparatus for facilitating speech barge-in in connection with voice recognition systems
US5943392A (en) * 1997-01-24 1999-08-24 Southwestern Bell Telephone Company Device for measuring echo return loss in a two-two wire line system
US5999828A (en) * 1997-03-19 1999-12-07 Qualcomm Incorporated Multi-user wireless telephone having dual echo cancellers
US6185280B1 (en) * 1998-02-12 2001-02-06 Intervoice Limited Partnership Line impedance matching using dynamically generated transfer functions
US6694019B1 (en) * 1999-08-26 2004-02-17 Nortel Networks Limited Method and apparatus for infinite return loss handler for network echo canceller
US7164659B2 (en) * 1999-12-09 2007-01-16 Broadcom Corporation Adaptive gain control based on echo canceller performance information
EP2267913A3 (de) * 2000-01-25 2012-10-10 Aware, Inc. System und Verfahren zur Anwendung von einem lMS Verfahren zur Aktualisierung eines Echounterdrückers in einem ADSL Modem
US6952472B2 (en) * 2001-12-31 2005-10-04 Texas Instruments Incorporated Dynamically estimating echo return loss in a communication link
US6961421B2 (en) * 2002-06-17 2005-11-01 Texas Instruments Incorporated Echo analysis for identification of hybrid induced echo in a communication link
US7027562B2 (en) * 2003-09-05 2006-04-11 Siemens Communications, Inc. System and method to reduce echoes in voice communications
GB2416971A (en) * 2004-08-04 2006-02-08 Mitel Networks Corp Calculating an expected echo return loss enhancement (erle) in an echo canceller
US8406415B1 (en) 2007-03-14 2013-03-26 Clearone Communications, Inc. Privacy modes in an open-air multi-port conferencing device
US8654955B1 (en) 2007-03-14 2014-02-18 Clearone Communications, Inc. Portable conferencing device with videoconferencing option
US7912211B1 (en) 2007-03-14 2011-03-22 Clearone Communications, Inc. Portable speakerphone device and subsystem
US8019076B1 (en) * 2007-03-14 2011-09-13 Clearone Communications, Inc. Portable speakerphone device and subsystem utilizing false doubletalk detection
US8077857B1 (en) 2007-03-14 2011-12-13 Clearone Communications, Inc. Portable speakerphone device with selective mixing
US8290142B1 (en) 2007-11-12 2012-10-16 Clearone Communications, Inc. Echo cancellation in a portable conferencing device with externally-produced audio
EP2107553B1 (de) * 2008-03-31 2011-05-18 Harman Becker Automotive Systems GmbH Verfahren zur Erkennung einer Unterbrechung einer Sprachausgabe
EP2148325B1 (de) * 2008-07-22 2014-10-01 Nuance Communications, Inc. Verfahren zur Bestimmung der Anwesenheit einer gewollten Signalkomponente
EP2850611B1 (de) 2012-06-10 2019-08-21 Nuance Communications, Inc. Rauschabhängige signalverarbeitung für fahrzeugkommunikationssystem mit mehreren akustischen zonen
CN104704560B (zh) 2012-09-04 2018-06-05 纽昂斯通讯公司 共振峰依赖的语音信号增强
US9613633B2 (en) 2012-10-30 2017-04-04 Nuance Communications, Inc. Speech enhancement
US9191493B2 (en) 2013-12-09 2015-11-17 Captioncall, Llc Methods and devices for updating an adaptive filter for echo cancellation
GB2519392B (en) 2014-04-02 2016-02-24 Imagination Tech Ltd Auto-tuning of an acoustic echo canceller
GB2521881B (en) 2014-04-02 2016-02-10 Imagination Tech Ltd Auto-tuning of non-linear processor threshold
US9479650B1 (en) 2015-05-04 2016-10-25 Captioncall, Llc Methods and devices for updating filter coefficients during echo cancellation

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4268727A (en) * 1979-03-14 1981-05-19 International Telephone And Telegraph Corporation Adaptive digital echo cancellation circuit
US4360712A (en) * 1979-09-05 1982-11-23 Communications Satellite Corporation Double talk detector for echo cancellers
CA1137240A (en) * 1980-09-09 1982-12-07 Northern Telecom Limited Method of and apparatus for echo detection in voice channel signals
DE3376943D1 (en) * 1983-06-30 1988-07-07 Ibm Starting-up method for an echo canceller filter, and communication system using this method
US4712235A (en) * 1984-11-19 1987-12-08 International Business Machines Corporation Method and apparatus for improved control and time sharing of an echo canceller
US5014263A (en) * 1987-10-02 1991-05-07 Advanced Micro Devices, Inc. Adaptive echo-canceller with double-talker detection
US4918727A (en) * 1988-06-09 1990-04-17 Tellabs Incorporated Double talk detector for echo canceller and method
US4912758A (en) * 1988-10-26 1990-03-27 International Business Machines Corporation Full-duplex digital speakerphone
DE3840433A1 (de) * 1988-12-01 1990-06-07 Philips Patentverwaltung Echokompensator
US5062102A (en) * 1988-12-01 1991-10-29 Nec Corporation Echo canceller with means for determining filter coefficients from autocorrelation and cross-correlation coefficients
US5305309A (en) * 1989-12-06 1994-04-19 Fujitsu Limited Echo canceller
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
US5157653A (en) * 1990-08-03 1992-10-20 Coherent Communications Systems Corp. Residual echo elimination with proportionate noise injection
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
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
US5307405A (en) * 1992-09-25 1994-04-26 Qualcomm Incorporated Network echo canceller

Also Published As

Publication number Publication date
DE69412290T2 (de) 1998-12-03
EP0755591A1 (de) 1997-01-29
US5577097A (en) 1996-11-19
EP0755591B1 (de) 1998-08-05
WO1995028774A1 (en) 1995-10-26
CA2146393C (en) 2000-05-02
CA2146393A1 (en) 1995-10-15
JPH09505709A (ja) 1997-06-03
JP2949601B2 (ja) 1999-09-20

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee