HK1017526A1 - An enhanced echo canceller for digital cellular application - Google Patents

An enhanced echo canceller for digital cellular application

Info

Publication number
HK1017526A1
HK1017526A1 HK99102481A HK99102481A HK1017526A1 HK 1017526 A1 HK1017526 A1 HK 1017526A1 HK 99102481 A HK99102481 A HK 99102481A HK 99102481 A HK99102481 A HK 99102481A HK 1017526 A1 HK1017526 A1 HK 1017526A1
Authority
HK
Hong Kong
Prior art keywords
echo canceller
digital cellular
cellular application
enhanced echo
enhanced
Prior art date
Application number
HK99102481A
Other languages
English (en)
Inventor
Dominic King-Choi Ho
Original Assignee
Nortel Networks 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 Nortel Networks Ltd filed Critical Nortel Networks Ltd
Publication of HK1017526A1 publication Critical patent/HK1017526A1/xx

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Telephone Function (AREA)
  • Filters That Use Time-Delay Elements (AREA)
HK99102481A 1996-08-01 1999-06-07 An enhanced echo canceller for digital cellular application HK1017526A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US69091496A 1996-08-01 1996-08-01
PCT/CA1996/000771 WO1998006185A1 (en) 1996-08-01 1996-11-25 Echo cancelling system for digital telephony applications

Publications (1)

Publication Number Publication Date
HK1017526A1 true HK1017526A1 (en) 1999-11-19

Family

ID=24774476

Family Applications (1)

Application Number Title Priority Date Filing Date
HK99102481A HK1017526A1 (en) 1996-08-01 1999-06-07 An enhanced echo canceller for digital cellular application

Country Status (8)

Country Link
US (1) US5912966A (xx)
EP (1) EP0853844B1 (xx)
JP (1) JPH11513230A (xx)
CN (1) CN1111973C (xx)
CA (1) CA2231605C (xx)
DE (1) DE69627359T2 (xx)
HK (1) HK1017526A1 (xx)
WO (1) WO1998006185A1 (xx)

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WO1999014868A1 (fr) * 1997-09-16 1999-03-25 Sanyo Electric Co., Ltd. Procede de suppression d'echo, annuleur d'echo et commutateur vocal
EP1022865B1 (en) * 1997-09-16 2011-03-30 Sanyo Electric Co., Ltd. Echo canceller and echo cancelling method
US6181791B1 (en) * 1998-01-06 2001-01-30 Stmicroelectronics, Inc. Apparatus and method for reducing local interference in subscriber loop communication system
GB2336279A (en) * 1998-03-30 1999-10-13 Motorola Inc Echo canceller and method for device having a decoder
FI981091A (fi) 1998-05-15 1999-11-16 Nokia Networks Oy Menetelmä ja laitteisto kaiun poistamiseksi digitaalisessa matkaviestinjärjestelmässä
US6560332B1 (en) 1999-05-18 2003-05-06 Telefonaktiebolaget Lm Ericsson (Publ) Methods and apparatus for improving echo suppression in bi-directional communications systems
AU1359601A (en) 1999-11-03 2001-05-14 Tellabs Operations, Inc. Integrated voice processing system for packet networks
US6804350B1 (en) * 2000-12-21 2004-10-12 Cisco Technology, Inc. Method and apparatus for improving echo cancellation in non-voip systems
JP3771812B2 (ja) * 2001-05-28 2006-04-26 インターナショナル・ビジネス・マシーンズ・コーポレーション ロボットおよびその制御方法
KR100431965B1 (ko) * 2001-06-23 2004-07-21 (주) 에스제이-테크 시변 적응알고리즘이 적용된 음향반향 제거장치 및 그 방법
US6970896B2 (en) 2001-08-08 2005-11-29 Octasic Inc. Method and apparatus for generating a set of filter coefficients
US6957240B2 (en) * 2001-08-08 2005-10-18 Octasic Inc. Method and apparatus for providing an error characterization estimate of an impulse response derived using least squares
US6965640B2 (en) * 2001-08-08 2005-11-15 Octasic Inc. Method and apparatus for generating a set of filter coefficients providing adaptive noise reduction
US6999509B2 (en) * 2001-08-08 2006-02-14 Octasic Inc. Method and apparatus for generating a set of filter coefficients for a time updated adaptive filter
US6751313B2 (en) * 2001-10-31 2004-06-15 Conexant Systems, Inc. Method and apparatus for an improved echo canceller
KR100466567B1 (ko) * 2002-11-26 2005-01-15 현대모비스 주식회사 반향 신호 제거장치
EP1718103B1 (en) 2005-04-29 2009-12-02 Harman Becker Automotive Systems GmbH Compensation of reverberation and feedback
CN101312372B (zh) * 2008-05-12 2013-01-02 北京创毅视讯科技有限公司 一种回波消除器及回波消除方法
GB2465047B (en) * 2009-09-03 2010-09-22 Peter Graham Craven Prediction of signals
CN103795473B (zh) * 2012-11-02 2017-04-12 华为技术有限公司 消除工频干扰的方法和系统
US10468020B2 (en) * 2017-06-06 2019-11-05 Cypress Semiconductor Corporation Systems and methods for removing interference for audio pattern recognition
US10547394B2 (en) * 2017-07-13 2020-01-28 Benjamin J. Egg Quad band relay common data link system and method
CN109040499B (zh) * 2018-08-14 2020-12-01 西南交通大学 一种抗冲击干扰的自适应回声消除方法

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US4468641A (en) * 1982-06-28 1984-08-28 At&T Bell Laboratories Adaptive filter update normalization
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
US4584411A (en) * 1985-02-25 1986-04-22 Shell Oil Company Hydroformylation process
EP0199879B1 (en) * 1985-04-30 1990-03-21 International Business Machines Corporation A process and system for improving echo cancellation within a transmission network
US4697261A (en) * 1986-09-05 1987-09-29 M/A-Com Government Systems, Inc. Linear predictive echo canceller integrated with RELP vocoder
US5062102A (en) * 1988-12-01 1991-10-29 Nec Corporation Echo canceller with means for determining filter coefficients from autocorrelation and cross-correlation coefficients
JPH0748681B2 (ja) * 1989-02-23 1995-05-24 日本電気株式会社 エコー消去器の係数制御方法
JP2842607B2 (ja) * 1989-03-13 1999-01-06 株式会社日立製作所 エコーキャンセラ、それを備えた通信装置および信号処理方法
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
JP3047300B2 (ja) * 1990-02-16 2000-05-29 富士通株式会社 ハンズフリー会話機能を有する通話装置
JPH03262939A (ja) * 1990-03-14 1991-11-22 Fujitsu Ltd エコー経路変動検出方法およびその装置
US5263019A (en) * 1991-01-04 1993-11-16 Picturetel Corporation Method and apparatus for estimating the level of acoustic feedback between a loudspeaker and microphone
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
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
EP0543568A2 (en) * 1991-11-22 1993-05-26 AT&T Corp. High resolution filtering using low resolution processors
CA2060667C (en) * 1992-02-05 1998-12-08 Paul Marc Yatrou Adaptive sparse echo canceller using a sub-rate filter for active tap selection
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
US5374705A (en) * 1993-12-27 1994-12-20 The Dow Chemical Company Process for the preparation of polyether polyols with a reduced unsaturation content
US5475731A (en) * 1994-01-07 1995-12-12 Ericsson Inc. Echo-canceling system and method using echo estimate to modify error signal
DE69532394T2 (de) * 1994-02-10 2004-11-04 Nippon Telegraph And Telephone Corp. Verfahren und Vorrichtung zur Echokompensation mit Anwendung der "fast projection scheme"
US5592548A (en) * 1995-05-31 1997-01-07 Qualcomm Incorporated System and method for avoiding false convergence in the presence of tones in a time-domain echo cancellation process
US5613899A (en) * 1995-06-05 1997-03-25 Southern Carbide Specialists, Inc. Centerless ceramic ferrule grinder

Also Published As

Publication number Publication date
DE69627359T2 (de) 2003-10-30
JPH11513230A (ja) 1999-11-09
DE69627359D1 (de) 2003-05-15
CN1111973C (zh) 2003-06-18
CA2231605A1 (en) 1998-02-12
US5912966A (en) 1999-06-15
WO1998006185A1 (en) 1998-02-12
EP0853844A1 (en) 1998-07-22
EP0853844B1 (en) 2003-04-09
CN1203711A (zh) 1998-12-30
CA2231605C (en) 2001-11-06

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Legal Events

Date Code Title Description
PF Patent in force
PC Patent ceased (i.e. patent has lapsed due to the failure to pay the renewal fee)

Effective date: 20071125