DE3570561D1 - Adaptive filter update gain normalization - Google Patents

Adaptive filter update gain normalization

Info

Publication number
DE3570561D1
DE3570561D1 DE8585306609T DE3570561T DE3570561D1 DE 3570561 D1 DE3570561 D1 DE 3570561D1 DE 8585306609 T DE8585306609 T DE 8585306609T DE 3570561 T DE3570561 T DE 3570561T DE 3570561 D1 DE3570561 D1 DE 3570561D1
Authority
DE
Germany
Prior art keywords
adaptive filter
filter update
gain normalization
update gain
normalization
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
Application number
DE8585306609T
Other languages
English (en)
Inventor
Donald Lars Duttweiler
John Hartung
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
American Telephone and Telegraph Co Inc
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 American Telephone and Telegraph Co Inc filed Critical American Telephone and Telegraph Co Inc
Application granted granted Critical
Publication of DE3570561D1 publication Critical patent/DE3570561D1/de
Expired 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H21/00—Adaptive networks
    • H03H21/0012—Digital adaptive filters
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H21/00—Adaptive networks
    • H03H21/0012—Digital adaptive filters
    • H03H2021/007—Computation saving measures; Accelerating measures
    • H03H2021/0076—Measures relating to the convergence time
    • H03H2021/0078—Measures relating to the convergence time varying the step size
    • 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)
  • 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)
DE8585306609T 1984-09-26 1985-09-17 Adaptive filter update gain normalization Expired DE3570561D1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/654,410 US4591669A (en) 1984-09-26 1984-09-26 Adaptive filter update gain normalization

Publications (1)

Publication Number Publication Date
DE3570561D1 true DE3570561D1 (en) 1989-06-29

Family

ID=24624729

Family Applications (1)

Application Number Title Priority Date Filing Date
DE8585306609T Expired DE3570561D1 (en) 1984-09-26 1985-09-17 Adaptive filter update gain normalization

Country Status (5)

Country Link
US (1) US4591669A (de)
EP (1) EP0176312B1 (de)
JP (1) JPH0671220B2 (de)
CA (1) CA1220823A (de)
DE (1) DE3570561D1 (de)

Families Citing this family (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0167677B1 (de) * 1984-07-13 1989-03-08 BELL TELEPHONE MANUFACTURING COMPANY Naamloze Vennootschap Anordnung zur Signalverarbeitung
JPS62104324A (ja) * 1985-10-31 1987-05-14 Toshiba Corp 適応形自動等化器
US4697261A (en) * 1986-09-05 1987-09-29 M/A-Com Government Systems, Inc. Linear predictive echo canceller integrated with RELP vocoder
US4845746A (en) * 1987-06-23 1989-07-04 Rockwell International Corporation Echo canceller with relative feedback control
FR2618277B1 (fr) * 1987-07-16 1989-12-15 Centre Nat Rech Scient Predicteur adaptatif.
JPH02280422A (ja) * 1989-04-20 1990-11-16 Nec Corp 音声会議装置用エコーキャンセラのトレーニング方法
NL8901247A (nl) * 1989-05-19 1990-12-17 Philips Nv Adaptief tijddiscreet transversaal filter.
EP0420269A3 (en) * 1989-09-28 1992-12-30 Fujitsu Limited Adaptive digital filter including low-pass filter
FR2671221B1 (fr) * 1990-12-27 1995-03-31 Alcatel Radiotelephone Dispositif pour annulation de bruit acoustique.
JP2842026B2 (ja) * 1991-02-20 1998-12-24 日本電気株式会社 適応フィルタの係数制御方法及び装置
EP0715407B1 (de) * 1991-02-20 2002-06-05 Nec Corporation Verfahren und Vorrichtung zur Kontrolle der Koeffizienten eines adaptiven Filters
EP0515761A1 (de) * 1991-05-31 1992-12-02 International Business Machines Corporation Verfahren und Einrichtung zur adaptiven Entzerrung eines Signals in einer Datenendeinrichtung
DE69207509T2 (de) * 1991-08-20 1996-08-22 Philips Electronics Nv Telekommunikationssystem mit einer Leitung für digitalen Verkehr mit einer Anordnung zum Abzweigen des digitalen Duplexverkehrs, und Anordnung zur Anwendung in dem Telekommunikationssystem
US5268927A (en) * 1992-10-06 1993-12-07 Mayflower Communications Company, Inc. Digital adaptive transversal filter for spread spectrum receivers
US5412686A (en) * 1993-09-17 1995-05-02 Motorola Inc. Method and apparatus for power estimation in a communication system
FI935834A (fi) * 1993-12-23 1995-06-24 Nokia Telecommunications Oy Menetelmä kaikukohtaan sovittautumiseksi kaiunpoistajassa
JP2947093B2 (ja) * 1994-11-02 1999-09-13 日本電気株式会社 適応フィルタによるシステム同定の方法および装置
JP3381112B2 (ja) * 1995-03-09 2003-02-24 ソニー株式会社 エコー除去装置
US5596600A (en) * 1995-04-06 1997-01-21 Mayflower Communications Company, Inc. Standalone canceller of narrow band interference for spread spectrum receivers
FR2738695B1 (fr) * 1995-09-13 1997-11-14 France Telecom Procede et dispositif d'identification adaptative et annuleur d'echo adaptatif incluant un tel dispositif
US5734715A (en) * 1995-09-13 1998-03-31 France Telecom Process and device for adaptive identification and adaptive echo canceller relating thereto
SE505152C2 (sv) * 1995-10-11 1997-07-07 Ericsson Telefon Ab L M Adaptivt ekosläckningsförfarande
US5668865A (en) * 1996-02-26 1997-09-16 Lucent Technologies Inc. Echo canceler E-side speech detector
JP2924762B2 (ja) * 1996-02-28 1999-07-26 日本電気株式会社 アダプティブフィルタ及びその適応化方法
DE69630784T2 (de) * 1996-09-24 2004-09-30 Hewlett-Packard Co. (N.D.Ges.D.Staates Delaware), Palo Alto Datenverarbeitungsgerät und -verfahren
US6185299B1 (en) * 1997-10-31 2001-02-06 International Business Machines Corporation Adaptive echo cancellation device in a voice communication system
US6570985B1 (en) 1998-01-09 2003-05-27 Ericsson Inc. Echo canceler adaptive filter optimization
US6249147B1 (en) 1999-03-09 2001-06-19 Fujitsu, Ltd. Method and apparatus for high speed on-chip signal propagation
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
US6813352B1 (en) 1999-09-10 2004-11-02 Lucent Technologies Inc. Quadrature filter augmentation of echo canceler basis functions
DE10030123A1 (de) * 2000-06-20 2002-01-03 Infineon Technologies Ag Schaltungsanordnung zur analogen Echounterdrückung
GB2372653A (en) * 2000-09-29 2002-08-28 Univ Bristol Adaptive filters
US7035397B2 (en) * 2001-09-14 2006-04-25 Agere Systems Inc. System and method for updating filter coefficients and echo canceller including same
US7151803B1 (en) 2002-04-01 2006-12-19 At&T Corp. Multiuser allocation method for maximizing transmission capacity
JP2007514358A (ja) * 2003-12-10 2007-05-31 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ 個別の更新制御機構を備えた適応フィルタの直列構成を有するエコーキャンセラ

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS579258B1 (de) * 1971-05-15 1982-02-20
GB1434239A (en) * 1972-08-10 1976-05-05 Siemens Ag Echo cancellers
US4129753A (en) * 1977-12-09 1978-12-12 Bell Telephone Laboratories, Incorporated Echo canceller using feedback to improve speech detector performance
US4468641A (en) * 1982-06-28 1984-08-28 At&T Bell Laboratories Adaptive filter update normalization
US4468640A (en) * 1982-06-28 1984-08-28 At&T Bell Laboratories Adaptive filter update normalization
US4467441A (en) * 1982-10-08 1984-08-21 At&T Bell Laboratories Adaptive filter including controlled tap coefficient leakage

Also Published As

Publication number Publication date
JPS6184927A (ja) 1986-04-30
CA1220823A (en) 1987-04-21
JPH0671220B2 (ja) 1994-09-07
EP0176312B1 (de) 1989-05-24
US4591669A (en) 1986-05-27
EP0176312A1 (de) 1986-04-02

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Legal Events

Date Code Title Description
8328 Change in the person/name/address of the agent

Free format text: BLUMBACH, KRAMER & PARTNER, 65193 WIESBADEN

8339 Ceased/non-payment of the annual fee