DE69019197D1 - Echokompensator mit FIR und IIR Filtern für Kompensation von Echos mit langem Ausschwingen. - Google Patents

Echokompensator mit FIR und IIR Filtern für Kompensation von Echos mit langem Ausschwingen.

Info

Publication number
DE69019197D1
DE69019197D1 DE69019197T DE69019197T DE69019197D1 DE 69019197 D1 DE69019197 D1 DE 69019197D1 DE 69019197 T DE69019197 T DE 69019197T DE 69019197 T DE69019197 T DE 69019197T DE 69019197 D1 DE69019197 D1 DE 69019197D1
Authority
DE
Germany
Prior art keywords
echoes
fir
compensation
echo canceller
iir filters
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
DE69019197T
Other languages
English (en)
Other versions
DE69019197T2 (de
Inventor
Shin Ichi Koike
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.)
NEC Corp
Original Assignee
NEC 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 NEC Corp filed Critical NEC Corp
Application granted granted Critical
Publication of DE69019197D1 publication Critical patent/DE69019197D1/de
Publication of DE69019197T2 publication Critical patent/DE69019197T2/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
    • H04B3/237—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 two adaptive filters, e.g. for near end and for end echo cancelling
    • 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
    • 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)
DE69019197T 1989-02-23 1990-02-23 Echokompensator mit FIR und IIR Filtern für Kompensation von Echos mit langem Ausschwingen. Expired - Fee Related DE69019197T2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP4180489 1989-02-23
JP1328341A JPH0748681B2 (ja) 1989-02-23 1989-12-20 エコー消去器の係数制御方法

Publications (2)

Publication Number Publication Date
DE69019197D1 true DE69019197D1 (de) 1995-06-14
DE69019197T2 DE69019197T2 (de) 1995-09-07

Family

ID=26381472

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69019197T Expired - Fee Related DE69019197T2 (de) 1989-02-23 1990-02-23 Echokompensator mit FIR und IIR Filtern für Kompensation von Echos mit langem Ausschwingen.

Country Status (5)

Country Link
US (1) US5084865A (de)
EP (1) EP0384490B1 (de)
JP (1) JPH0748681B2 (de)
CA (1) CA2010652C (de)
DE (1) DE69019197T2 (de)

Families Citing this family (47)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04284030A (ja) * 1991-03-13 1992-10-08 Nec Corp エコー消去器の収束時間短縮方法
JPH04369932A (ja) * 1991-06-19 1992-12-22 Hitachi Ltd エコーキャンセラ、および、それを用いた伝送装置
US5418778A (en) * 1992-02-14 1995-05-23 Itt Corporation Local and remote echo canceling apparatus particularly adapted for use in a full duplex modem
JP2663820B2 (ja) * 1992-12-28 1997-10-15 日本電気株式会社 判定帰還形等化器
US5475731A (en) * 1994-01-07 1995-12-12 Ericsson Inc. Echo-canceling system and method using echo estimate to modify error signal
US5473686A (en) * 1994-02-01 1995-12-05 Tandy Corporation Echo cancellation apparatus
EP0691756A1 (de) 1994-07-07 1996-01-10 Siemens-Albis Aktiengesellschaft Echokompensator mit analogen Grobkompensator und digitalem Feinkompensator
US5649010A (en) * 1994-07-20 1997-07-15 Siemens Schweiz Ag Send filter for an echo canceler
JP3336126B2 (ja) * 1994-09-05 2002-10-21 富士通株式会社 エコーキャンセラの波形歪み補償装置
US5790632A (en) * 1994-09-30 1998-08-04 Qualcom Incorporated Method and apparatus for echo canceling accounting for companding induced quantization error
FI97836C (fi) * 1994-10-31 1997-02-25 Nokia Telecommunications Oy Menetelmä tietoliikenneyhteyden muodostamiseksi
US5680450A (en) * 1995-02-24 1997-10-21 Ericsson Inc. Apparatus and method for canceling acoustic echoes including non-linear distortions in loudspeaker telephones
US5600718A (en) * 1995-02-24 1997-02-04 Ericsson Inc. Apparatus and method for adaptively precompensating for loudspeaker distortions
US5675644A (en) * 1995-09-26 1997-10-07 Qualcomm Incorporated Method and apparatus for canceling echo accounting for delay variations
US5825753A (en) * 1995-09-29 1998-10-20 Paradyne Corporation Echo canceler gain tracker for cellular modems
US5682378A (en) * 1995-11-14 1997-10-28 Paradyne Corporation Echo cancellation for modems
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
US5966438A (en) * 1996-03-05 1999-10-12 Ericsson Inc. Method and apparatus for adaptive volume control for a radiotelephone
US5721782A (en) * 1996-03-25 1998-02-24 Motorola, Inc. Partitioned echo canceler utilizing decimation echo location
US5796819A (en) * 1996-07-24 1998-08-18 Ericsson Inc. Echo canceller for non-linear circuits
WO1998006185A1 (en) * 1996-08-01 1998-02-12 Northern Telecom Limited Echo cancelling system for digital telephony applications
DE19639703C2 (de) * 1996-09-26 1999-05-20 Siemens Ag Verfahren und Anordnung zur Echokompensation
DE19639702C2 (de) * 1996-09-26 2000-11-16 Siemens Ag Verfahren und Anordnung zur Begrenzung des Restechos
US6137919A (en) * 1997-04-04 2000-10-24 Avid Technology, Inc. Apparatus and methods for feathering a composite image
GB2330745B (en) * 1997-10-24 2002-08-21 Mitel Corp Nonlinear processor for acoustic echo canceller
US6256383B1 (en) 1997-11-07 2001-07-03 Legerity, Inc. IIR filter of adaptive balance circuit for long tail echo cancellation
DE69907864T2 (de) * 1999-03-05 2004-05-06 Stmicroelectronics N.V. Übertragungssystem digitaler Teilnehmerleitungen mit Mitteln zur Sicherung der Orthogonalität eines lokalen Echos
DE19923601C1 (de) * 1999-05-24 2000-10-05 Matthias Waldorf Echokompensationseinrichtung
DE19955596A1 (de) 1999-11-18 2001-06-13 Infineon Technologies Ag Vorrichtung und Verfahren zur Echokompensation bei Gleichlage-Übertragungsverfahren im Duplex-Betrieb über eine Zweidrahtleitung
US7194037B1 (en) 2000-05-23 2007-03-20 Marvell International Ltd. Active replica transformer hybrid
US7312739B1 (en) 2000-05-23 2007-12-25 Marvell International Ltd. Communication driver
USRE41831E1 (en) 2000-05-23 2010-10-19 Marvell International Ltd. Class B driver
US7113121B1 (en) 2000-05-23 2006-09-26 Marvell International Ltd. Communication driver
US7095348B1 (en) 2000-05-23 2006-08-22 Marvell International Ltd. Communication driver
US6462688B1 (en) 2000-12-18 2002-10-08 Marvell International, Ltd. Direct drive programmable high speed power digital-to-analog converter
US6775529B1 (en) 2000-07-31 2004-08-10 Marvell International Ltd. Active resistive summer for a transformer hybrid
US7433665B1 (en) 2000-07-31 2008-10-07 Marvell International Ltd. Apparatus and method for converting single-ended signals to a differential signal, and transceiver employing same
US7606547B1 (en) * 2000-07-31 2009-10-20 Marvell International Ltd. Active resistance summer for a transformer hybrid
US7068780B1 (en) * 2000-08-30 2006-06-27 Conexant, Inc. Hybrid echo canceller
US7003093B2 (en) 2000-09-08 2006-02-21 Intel Corporation Tone detection for integrated telecommunications processing
US6738358B2 (en) 2000-09-09 2004-05-18 Intel Corporation Network echo canceller for integrated telecommunications processing
US7200221B2 (en) * 2002-05-16 2007-04-03 Industrial Technology Research Institute Methods and systems for providing multi-path echo cancellation
US7023963B1 (en) 2002-09-18 2006-04-04 Adtran, Inc. DSL line card echo canceler-based mechanism for locating telecommunication line fault
US7460498B2 (en) * 2003-12-04 2008-12-02 Adtran, Inc. System and method for detecting anomalies along telecommunication lines
US7312662B1 (en) 2005-08-09 2007-12-25 Marvell International Ltd. Cascode gain boosting system and method for a transmitter
US7577892B1 (en) 2005-08-25 2009-08-18 Marvell International Ltd High speed iterative decoder
EP1796281B1 (de) * 2005-12-09 2015-08-12 Mitel Networks Corporation Echounterdrücker

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2272544B1 (de) * 1974-05-24 1977-03-11 Cit Alcatel
US4087654A (en) * 1975-11-28 1978-05-02 Bell Telephone Laboratories, Incorporated Echo canceller for two-wire full duplex data transmission
US4707824A (en) * 1983-12-15 1987-11-17 Nec Corporation Method and apparatus for cancelling echo
ATE77719T1 (de) * 1986-11-17 1992-07-15 Alcatel Nv Einstellbarer echokompensator.
NL8603247A (nl) * 1986-12-22 1988-07-18 At & T & Philips Telecomm Adaptief tijd-discreet filter voor het vormen van een compensatiesignaal uit synchrone datasymbolen.
DE3702316C1 (en) * 1987-01-27 1988-02-11 Ant Nachrichtentech Method and circuit arrangements for adaptive echo cancellation in terminals for duplex transmission
US5042026A (en) * 1987-03-03 1991-08-20 Nec Corporation Circuit for cancelling whole or part of a waveform using nonrecursive and recursive filters
JPH0752859B2 (ja) * 1987-11-06 1995-06-05 日本電気株式会社 エコー除去装置

Also Published As

Publication number Publication date
EP0384490A2 (de) 1990-08-29
JPH0748681B2 (ja) 1995-05-24
US5084865A (en) 1992-01-28
EP0384490B1 (de) 1995-05-10
DE69019197T2 (de) 1995-09-07
CA2010652A1 (en) 1990-08-23
CA2010652C (en) 1994-05-31
JPH02290337A (ja) 1990-11-30
EP0384490A3 (de) 1992-05-13

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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