DE68912372D1 - Einrichtung zur Echokompensation mit Filterung in Frequenzteilbändern. - Google Patents

Einrichtung zur Echokompensation mit Filterung in Frequenzteilbändern.

Info

Publication number
DE68912372D1
DE68912372D1 DE89400703T DE68912372T DE68912372D1 DE 68912372 D1 DE68912372 D1 DE 68912372D1 DE 89400703 T DE89400703 T DE 89400703T DE 68912372 T DE68912372 T DE 68912372T DE 68912372 D1 DE68912372 D1 DE 68912372D1
Authority
DE
Germany
Prior art keywords
filtering
echo cancellation
frequency subbands
subbands
frequency
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
DE89400703T
Other languages
English (en)
Other versions
DE68912372T2 (de
Inventor
Andre Gilloire
Martin Vetterli
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.)
Orange SA
Original Assignee
France Telecom SA
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 France Telecom SA filed Critical France Telecom SA
Publication of DE68912372D1 publication Critical patent/DE68912372D1/de
Application granted granted Critical
Publication of DE68912372T2 publication Critical patent/DE68912372T2/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
    • 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
    • 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
    • H04B3/23—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
    • H04B3/238—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 initial training sequence

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
DE68912372T 1988-03-15 1989-03-14 Einrichtung zur Echokompensation mit Filterung in Frequenzteilbändern. Expired - Lifetime DE68912372T2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8803341A FR2628918B1 (fr) 1988-03-15 1988-03-15 Dispositif annuleur d'echo a filtrage en sous-bandes de frequence

Publications (2)

Publication Number Publication Date
DE68912372D1 true DE68912372D1 (de) 1994-03-03
DE68912372T2 DE68912372T2 (de) 1994-07-28

Family

ID=9364277

Family Applications (1)

Application Number Title Priority Date Filing Date
DE68912372T Expired - Lifetime DE68912372T2 (de) 1988-03-15 1989-03-14 Einrichtung zur Echokompensation mit Filterung in Frequenzteilbändern.

Country Status (5)

Country Link
US (1) US4956838A (de)
EP (1) EP0333581B1 (de)
CA (1) CA1338154C (de)
DE (1) DE68912372T2 (de)
FR (1) FR2628918B1 (de)

Families Citing this family (59)

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CA2004379C (en) * 1988-12-01 1993-07-06 Tetsu Taguchi Echo canceller with means for determining filter coefficients from autocorrelation and cross-correlation coefficients
EP0420269A3 (en) * 1989-09-28 1992-12-30 Fujitsu Limited Adaptive digital filter including low-pass filter
GB2240452A (en) * 1990-01-10 1991-07-31 Motorola Inc Echo canceller has plurality of sub-band channels each with its own adaptive filter
WO1991012683A1 (fr) * 1990-02-16 1991-08-22 Fujitsu Limited Dispositif de transmission de parole a fonction conversationnelle mains libres
US5224171A (en) * 1990-07-31 1993-06-29 Sony Corporation Method for printing on synthetic resin molded body and headphone housing on which printing has been made by the method
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
ES2038887B1 (es) * 1991-04-18 1995-05-01 Aplicaciones Electronicas Quas Hibrida digital para multiconferencia.
JP2792311B2 (ja) * 1992-01-31 1998-09-03 日本電気株式会社 多チャンネルエコー除去方法および装置
US5410595A (en) * 1992-11-12 1995-04-25 Motorola, Inc. Apparatus and method for noise reduction for a full-duplex speakerphone or the like
US5329587A (en) * 1993-03-12 1994-07-12 At&T Bell Laboratories Low-delay subband adaptive filter
SE501248C2 (sv) * 1993-05-14 1994-12-19 Ericsson Telefon Ab L M Metod och ekosläckare för ekoutsläckning med ett antal kaskadkopplade adaptiva filter
US5323458A (en) * 1993-10-25 1994-06-21 Motorola Inc. Echo cancellation in a full-duplex speakerphone
US5644596A (en) * 1994-02-01 1997-07-01 Qualcomm Incorporated Method and apparatus for frequency selective adaptive filtering
DE4427124A1 (de) * 1994-07-30 1996-02-01 Philips Patentverwaltung Anordnung zur Kommunikation mit einem Teilnehmer
US5502717A (en) * 1994-08-01 1996-03-26 Motorola Inc. Method and apparatus for estimating echo cancellation time
US5764759A (en) * 1994-10-06 1998-06-09 Dialogic Corporation Call processing using previously obtained line characteristics
FR2729024A1 (fr) * 1994-12-30 1996-07-05 Matra Communication Annuleur d'echo acoustique avec filtrage en sous-bandes
US5561668A (en) * 1995-07-06 1996-10-01 Coherent Communications Systems Corp. Echo canceler with subband attenuation and noise injection control
US5825754A (en) * 1995-12-28 1998-10-20 Vtel Corporation Filter and process for reducing noise in audio signals
US5774562A (en) * 1996-03-25 1998-06-30 Nippon Telegraph And Telephone Corp. Method and apparatus for dereverberation
CN1166160C (zh) * 1996-05-31 2004-09-08 皇家菲利浦电子有限公司 抑制输入信号中干扰成分的设备
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
US5796819A (en) * 1996-07-24 1998-08-18 Ericsson Inc. Echo canceller for non-linear circuits
DE19639703C2 (de) * 1996-09-26 1999-05-20 Siemens Ag Verfahren und Anordnung zur Echokompensation
FR2758677B1 (fr) * 1997-01-21 1999-04-02 Matra Communication Procede d'annulation d'echo et annuleur d'echo mettant en oeuvre un tel procede
US5933495A (en) * 1997-02-07 1999-08-03 Texas Instruments Incorporated Subband acoustic noise suppression
DE19805942C1 (de) * 1998-02-13 1999-08-12 Siemens Ag Verfahren zur Verbesserung der akustischen Rückhördämpfung in Freisprecheinrichtungen
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
US6744887B1 (en) * 1999-10-05 2004-06-01 Zhone Technologies, Inc. Acoustic echo processing system
SE0202159D0 (sv) 2001-07-10 2002-07-09 Coding Technologies Sweden Ab Efficientand scalable parametric stereo coding for low bitrate applications
ES2237706T3 (es) 2001-11-29 2005-08-01 Coding Technologies Ab Reconstruccion de componentes de alta frecuencia.
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
TW574791B (en) * 2002-05-15 2004-02-01 Topic Semiconductor Corp Hardware reduction method for digital echo canceller or near-end crosstalk canceller
US6961373B2 (en) * 2002-07-01 2005-11-01 Solarflare Communications, Inc. Method and apparatus for channel equalization
US7065167B2 (en) * 2002-07-10 2006-06-20 Solarflare Communications, Inc. Method and apparatus for constellation shaping
US7133425B2 (en) * 2002-07-10 2006-11-07 Solarflare Communications, Inc. Communication system
US7809021B2 (en) 2002-07-10 2010-10-05 Solarflare Communications, Inc. Communication system and encoding method having low overhead
SE0202770D0 (sv) * 2002-09-18 2002-09-18 Coding Technologies Sweden Ab Method for reduction of aliasing introduces by spectral envelope adjustment in real-valued filterbanks
US7062040B2 (en) * 2002-09-20 2006-06-13 Agere Systems Inc. Suppression of echo signals and the like
US6912208B2 (en) * 2002-11-07 2005-06-28 Solarflare Communications, Inc. Method and apparatus for equalization and crosstalk mitigation
US7164764B2 (en) * 2002-11-07 2007-01-16 Solarflare Communications, Inc. Method and apparatus for precode crosstalk mitigation
US7002897B2 (en) * 2003-04-28 2006-02-21 Solarflare Communications, Inc. Multiple channel interference cancellation
US8363535B2 (en) * 2003-04-28 2013-01-29 Marvell International Ltd. Frequency domain echo and next cancellation
US20040213354A1 (en) * 2003-04-28 2004-10-28 Jones William W. Mixed domain cancellation
JP2006524970A (ja) * 2003-04-28 2006-11-02 ソーラーフレア・コミュニケーションズ・インコーポレイテッド 多重チャネルにおける混信の解消
US8457614B2 (en) * 2005-04-07 2013-06-04 Clearone Communications, Inc. Wireless multi-unit conference phone
US20070189505A1 (en) * 2006-01-31 2007-08-16 Freescale Semiconductor, Inc. Detecting reflections in a communication channel
US8761387B2 (en) 2006-05-04 2014-06-24 Mindspeed Technologies, Inc. Analog transmit crosstalk canceller
US7720068B2 (en) 2006-08-23 2010-05-18 Solarflare Communications, Inc. Method and system for a multi-rate gigabit media independent interface
US7808407B2 (en) 2007-06-15 2010-10-05 Solarflare Communications, Inc. Sub-channel distortion mitigation in parallel digital systems
US7948862B2 (en) * 2007-09-26 2011-05-24 Solarflare Communications, Inc. Crosstalk cancellation using sliding filters
US8199927B1 (en) 2007-10-31 2012-06-12 ClearOnce Communications, Inc. Conferencing system implementing echo cancellation and push-to-talk microphone detection using two-stage frequency filter
US8050398B1 (en) 2007-10-31 2011-11-01 Clearone Communications, Inc. Adaptive conferencing pod sidetone compensator connecting to a telephonic device having intermittent sidetone
CN101897152B (zh) 2007-11-12 2014-01-15 马维尔国际有限公司 活动空闲通信系统
JP5345737B2 (ja) * 2009-10-21 2013-11-20 ドルビー インターナショナル アーベー 結合されたトランスポーザーフィルターバンクにおけるオーバーサンプリング
US7961415B1 (en) * 2010-01-28 2011-06-14 Quantum Corporation Master calibration channel for a multichannel tape drive
EP3800639B1 (de) 2015-03-27 2022-12-28 Dolby Laboratories Licensing Corporation Adaptive audiofiltrierung

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2517906A1 (fr) * 1981-12-03 1983-06-10 Centre Nat Rech Scient Annulateur d'echo a commande automatique de gain pour systemes de transmission
US4481622A (en) * 1982-04-01 1984-11-06 Anderson Jacobson, Inc. High speed dial-up telephone circuit full duplex data transmission techniques
US4644108A (en) * 1982-10-27 1987-02-17 International Business Machines Corporation Adaptive sub-band echo suppressor
DE3431141A1 (de) * 1984-08-24 1986-03-06 Siemens Ag Transversalfilter-echokompensator fuer lange akustische echos
JPH022340A (ja) * 1988-06-13 1990-01-08 Otsuka Takashi 変性水和コロイドの製造方法
JPH025722A (ja) * 1988-06-23 1990-01-10 Mitsubishi Electric Corp エンジンの燃料制御装置
JPH063424A (ja) * 1992-06-22 1994-01-11 Mitsubishi Electric Corp 集積回路装置、および集積回路装置に組込まれるテストデータ発生回路

Also Published As

Publication number Publication date
EP0333581A1 (de) 1989-09-20
FR2628918B1 (fr) 1990-08-10
FR2628918A1 (fr) 1989-09-22
CA1338154C (en) 1996-03-12
DE68912372T2 (de) 1994-07-28
EP0333581B1 (de) 1994-01-19
US4956838A (en) 1990-09-11

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