DE69522088D1 - Teilbandechokompensator - Google Patents

Teilbandechokompensator

Info

Publication number
DE69522088D1
DE69522088D1 DE69522088T DE69522088T DE69522088D1 DE 69522088 D1 DE69522088 D1 DE 69522088D1 DE 69522088 T DE69522088 T DE 69522088T DE 69522088 T DE69522088 T DE 69522088T DE 69522088 D1 DE69522088 D1 DE 69522088D1
Authority
DE
Germany
Prior art keywords
echo canceller
subband echo
subband
canceller
echo
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 - Lifetime
Application number
DE69522088T
Other languages
English (en)
Other versions
DE69522088T2 (de
Inventor
Donald Lars Duttweiler
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.)
AT&T Corp
Original Assignee
AT&T Corp
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 AT&T Corp filed Critical AT&T Corp
Publication of DE69522088D1 publication Critical patent/DE69522088D1/de
Application granted granted Critical
Publication of DE69522088T2 publication Critical patent/DE69522088T2/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H04B3/21—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
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H21/00—Adaptive networks
    • H03H21/0012—Digital adaptive filters

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Filters That Use Time-Delay Elements (AREA)
DE69522088T 1995-01-04 1995-12-12 Teilbandechokompensator Expired - Lifetime DE69522088T2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US08/368,687 US5566167A (en) 1995-01-04 1995-01-04 Subband echo canceler

Publications (2)

Publication Number Publication Date
DE69522088D1 true DE69522088D1 (de) 2001-09-13
DE69522088T2 DE69522088T2 (de) 2003-10-02

Family

ID=23452321

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69522088T Expired - Lifetime DE69522088T2 (de) 1995-01-04 1995-12-12 Teilbandechokompensator

Country Status (5)

Country Link
US (1) US5566167A (de)
EP (1) EP0721252B1 (de)
JP (1) JP3356369B2 (de)
CA (1) CA2164026C (de)
DE (1) DE69522088T2 (de)

Families Citing this family (49)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69634027T2 (de) * 1995-08-14 2005-12-22 Nippon Telegraph And Telephone Corp. Akustischer Teilband-Echokompensator
JP3199155B2 (ja) * 1995-10-18 2001-08-13 日本電信電話株式会社 反響消去装置
US5825754A (en) * 1995-12-28 1998-10-20 Vtel Corporation Filter and process for reducing noise in audio signals
US5937009A (en) * 1996-06-28 1999-08-10 Wong; Kon Max Sub-band echo canceller using optimum wavelet packets and cross-band cancellation
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
US6947474B2 (en) 1996-08-23 2005-09-20 Tensorcomm, Inc. Rake receiver for spread spectrum signal demodulation
US6430216B1 (en) 1997-08-22 2002-08-06 Data Fusion Corporation Rake receiver for spread spectrum signal demodulation
US5864545A (en) * 1996-12-06 1999-01-26 Altocom, Inc. System and method for improving convergence during modem training and reducing computational load during steady-state modem operations
GB2343801B (en) * 1997-08-21 2001-09-12 Data Fusion Corp Method and apparatus for acquiring wide-band pseudorandom noise encoded waveforms
US6256384B1 (en) * 1997-12-02 2001-07-03 Telefonaktiebolaget Lm Ericsson (Publ) Method and apparatus for cancelling echo originating from a mobile terminal
JP4417553B2 (ja) * 1998-02-13 2010-02-17 テレフオンアクチーボラゲット エル エム エリクソン（パブル） 雑音環境におけるフィルタ適応化の制御方法および装置
US6421377B1 (en) * 1998-05-13 2002-07-16 Globespanvirata, Inc. System and method for echo cancellation over asymmetric spectra
US6442275B1 (en) 1998-09-17 2002-08-27 Lucent Technologies Inc. Echo canceler including subband echo suppressor
US6434233B1 (en) * 1998-09-30 2002-08-13 Conexant Systems, Inc. Method and apparatus for canceling periodic interference signals in a digital data communication system
US7035396B1 (en) * 1999-01-22 2006-04-25 Agere Systems Inc. Configurable echo canceller
US6473409B1 (en) * 1999-02-26 2002-10-29 Microsoft Corp. Adaptive filtering system and method for adaptively canceling echoes and reducing noise in digital signals
US7512149B2 (en) * 2003-04-23 2009-03-31 At & T Intellectual Property Ii, L.P. Bit and power allocation scheme for full-duplex transmission with echo cancellation in multicarrier-based modems
US7424109B1 (en) * 1999-03-25 2008-09-09 Intel Corporation Rapid training echo cancellor for telecommunications system
US7933295B2 (en) 1999-04-13 2011-04-26 Broadcom Corporation Cable modem with voice processing capability
US6628781B1 (en) * 1999-06-03 2003-09-30 Telefonaktiebolaget Lm Ericsson (Publ) Methods and apparatus for improved sub-band adaptive filtering in echo cancellation systems
US6757385B1 (en) * 1999-06-04 2004-06-29 Telefonaktiebolaget Lm Ericsson (Publ) Symmetry based subband acoustic echo cancellation
US6813352B1 (en) 1999-09-10 2004-11-02 Lucent Technologies Inc. Quadrature filter augmentation of echo canceler basis functions
US20030118094A1 (en) * 2001-12-21 2003-06-26 Chih-Chi Wang Mixed time and frequency domains equalization algorithm for ADSL systems
JP3571013B2 (ja) * 2001-08-23 2004-09-29 エルピーダメモリ株式会社 半導体装置、その駆動方法及びその設定方法
US6771214B2 (en) 2001-09-12 2004-08-03 Data Fusion Corporation GPS near-far resistant receiver
US7151803B1 (en) 2002-04-01 2006-12-19 At&T Corp. Multiuser allocation method for maximizing transmission capacity
US6944289B2 (en) * 2002-10-01 2005-09-13 Motorola, Inc. Delay insertion for echo cancellation, with echo supression, in a communication network
US7289554B2 (en) * 2003-07-15 2007-10-30 Brooktree Broadband Holding, Inc. Method and apparatus for channel equalization and cyclostationary interference rejection for ADSL-DMT modems
EP1676261A1 (de) * 2003-10-16 2006-07-05 Koninklijke Philips Electronics N.V. Sprachaktivitätserkennung mit adaptiver rauschgrundwertverfolgung
US7251322B2 (en) * 2003-10-24 2007-07-31 Microsoft Corporation Systems and methods for echo cancellation with arbitrary playback sampling rates
CN1716798B (zh) * 2004-07-02 2011-03-02 朗迅科技公司 通信网络中消除回波的方法
US7903137B2 (en) * 2004-10-15 2011-03-08 Lifesize Communications, Inc. Videoconferencing echo cancellers
US7826624B2 (en) * 2004-10-15 2010-11-02 Lifesize Communications, Inc. Speakerphone self calibration and beam forming
US7720232B2 (en) * 2004-10-15 2010-05-18 Lifesize Communications, Inc. Speakerphone
US7970151B2 (en) * 2004-10-15 2011-06-28 Lifesize Communications, Inc. Hybrid beamforming
US7760887B2 (en) * 2004-10-15 2010-07-20 Lifesize Communications, Inc. Updating modeling information based on online data gathering
US7720236B2 (en) * 2004-10-15 2010-05-18 Lifesize Communications, Inc. Updating modeling information based on offline calibration experiments
US8116500B2 (en) * 2004-10-15 2012-02-14 Lifesize Communications, Inc. Microphone orientation and size in a speakerphone
US20060132595A1 (en) * 2004-10-15 2006-06-22 Kenoyer Michael L Speakerphone supporting video and audio features
US7693923B2 (en) * 2004-11-12 2010-04-06 Mediatek Inc. Digital filter system whose stopband roots lie on unit circle of complex plane and associated method
GB2438347B8 (en) * 2005-02-25 2009-04-08 Data Fusion Corp Mitigating interference in a signal
US7593539B2 (en) * 2005-04-29 2009-09-22 Lifesize Communications, Inc. Microphone and speaker arrangement in speakerphone
US7991167B2 (en) * 2005-04-29 2011-08-02 Lifesize Communications, Inc. Forming beams with nulls directed at noise sources
US7970150B2 (en) * 2005-04-29 2011-06-28 Lifesize Communications, Inc. Tracking talkers using virtual broadside scan and directed beams
EP1936939B1 (de) * 2006-12-18 2011-08-24 Harman Becker Automotive Systems GmbH Echokompensation mit geringer Komplexität
CN101878637B (zh) * 2007-11-29 2013-09-18 艾利森电话股份有限公司 用于对语音信号进行回声消除的方法和配置
JP5561025B2 (ja) * 2010-08-25 2014-07-30 沖電気工業株式会社 エコー経路特性推定装置、エコー経路特性推定プログラム及びエコーキャンセラー
EP2530840B1 (de) * 2011-05-30 2014-09-03 Harman Becker Automotive Systems GmbH Effiziente adaptive Subband-FIR-Filterung
US9210502B2 (en) * 2012-04-25 2015-12-08 Mitsubishi Electric Corporation Echo cancelling device

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3500000A (en) * 1966-10-31 1970-03-10 Myldred P Kelly Self-adaptive echo canceller
CA2015253A1 (en) * 1989-05-25 1990-11-25 Robert T. Beierle Adaptive analysis apparatus
CA2036078C (en) * 1990-02-21 1994-07-26 Fumio Amano Sub-band acoustic echo canceller
JPH04123621A (ja) * 1990-09-14 1992-04-23 Nippon Telegr & Teleph Corp <Ntt> 反響消去装置
DE69123579T2 (de) * 1991-09-06 1997-06-12 Ibm Verfahren zur adaptiven Echokompensation und Einrichtung zur Durchführung des Verfahrens
SE501248C2 (sv) * 1993-05-14 1994-12-19 Ericsson Telefon Ab L M Metod och ekosläckare för ekoutsläckning med ett antal kaskadkopplade adaptiva filter

Also Published As

Publication number Publication date
CA2164026A1 (en) 1996-07-05
EP0721252A1 (de) 1996-07-10
EP0721252B1 (de) 2001-08-08
JP3356369B2 (ja) 2002-12-16
JPH08251085A (ja) 1996-09-27
US5566167A (en) 1996-10-15
DE69522088T2 (de) 2003-10-02
CA2164026C (en) 2001-08-14

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Legal Events

Date Code Title Description
8332 No legal effect for de
8370 Indication related to discontinuation of the patent is to be deleted
8332 No legal effect for de
8370 Indication related to discontinuation of the patent is to be deleted
8364 No opposition during term of opposition