DE69211211D1 - Echokompensator - Google Patents

Echokompensator

Info

Publication number
DE69211211D1
DE69211211D1 DE69211211T DE69211211T DE69211211D1 DE 69211211 D1 DE69211211 D1 DE 69211211D1 DE 69211211 T DE69211211 T DE 69211211T DE 69211211 T DE69211211 T DE 69211211T DE 69211211 D1 DE69211211 D1 DE 69211211D1
Authority
DE
Germany
Prior art keywords
echo canceller
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 - Fee Related
Application number
DE69211211T
Other languages
English (en)
Other versions
DE69211211T2 (de
Inventor
Youtaro Yatsuzuka
Fumiaki Sugaya
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.)
KDDI Corp
Original Assignee
Kokusai Denshin Denwa KK
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 Kokusai Denshin Denwa KK filed Critical Kokusai Denshin Denwa KK
Application granted granted Critical
Publication of DE69211211D1 publication Critical patent/DE69211211D1/de
Publication of DE69211211T2 publication Critical patent/DE69211211T2/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
DE69211211T 1991-03-14 1992-03-12 Echokompensator Expired - Fee Related DE69211211T2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3073757A JP2836277B2 (ja) 1991-03-14 1991-03-14 エコーキャンセル装置

Publications (2)

Publication Number Publication Date
DE69211211D1 true DE69211211D1 (de) 1996-07-11
DE69211211T2 DE69211211T2 (de) 1996-11-14

Family

ID=13527432

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69211211T Expired - Fee Related DE69211211T2 (de) 1991-03-14 1992-03-12 Echokompensator

Country Status (5)

Country Link
US (1) US5263020A (de)
EP (1) EP0508847B1 (de)
JP (1) JP2836277B2 (de)
CA (1) CA2062701C (de)
DE (1) DE69211211T2 (de)

Families Citing this family (56)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI915196A (fi) * 1991-11-04 1993-05-05 Nokia Telecommunications Oy Foerfarande foer konvergering av en ekoslaeckare i boerjan av ett samtal
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
DE69330902T2 (de) * 1992-11-25 2002-06-20 Koninklijke Philips Electronics N.V., Eindhoven Echokompensator, Nachrichtenübertragungssystem und Station mit solch einem Echokompensator
US5548638A (en) * 1992-12-21 1996-08-20 Iwatsu Electric Co., Ltd. Audio teleconferencing apparatus
US5477534A (en) * 1993-07-30 1995-12-19 Kyocera Corporation Acoustic echo canceller
JP3068996B2 (ja) * 1993-12-21 2000-07-24 真作 森 適応フィルタ装置及びそのステップゲインの発生方法
US5475731A (en) * 1994-01-07 1995-12-12 Ericsson Inc. Echo-canceling system and method using echo estimate to modify error signal
ZA95599B (en) * 1994-02-28 1996-02-06 Qualcomm Inc Doubletalk detection by means of spectral content
US5577097A (en) * 1994-04-14 1996-11-19 Northern Telecom Limited Determining echo return loss in echo cancelling arrangements
US5535194A (en) * 1994-07-14 1996-07-09 Motorola, Inc. Method and apparatus for echo canceling with double-talk immunity
DE4427124A1 (de) * 1994-07-30 1996-02-01 Philips Patentverwaltung Anordnung zur Kommunikation mit einem Teilnehmer
DE19506324C1 (de) * 1995-02-23 1995-10-12 Siemens Ag Adaptives Balancefilter
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
US5631899A (en) * 1995-05-31 1997-05-20 Lucent Technologies Inc. Acoustic echo canceler
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
US5663955A (en) * 1995-08-25 1997-09-02 Lucent Technologies Inc. Echo canceller system with shared coefficient memory
US5664011A (en) * 1995-08-25 1997-09-02 Lucent Technologies Inc. Echo canceller with adaptive and non-adaptive filters
US5649012A (en) * 1995-09-15 1997-07-15 Hughes Electronics Method for synthesizing an echo path in an echo canceller
US5646990A (en) * 1995-09-21 1997-07-08 Rockwell International Corporation Efficient speakerphone anti-howling system
US5675644A (en) * 1995-09-26 1997-10-07 Qualcomm Incorporated Method and apparatus for canceling echo accounting for delay variations
US5812537A (en) * 1995-09-29 1998-09-22 Paradyne Corporation Echo canceling method and apparatus for data over cellular
US5815496A (en) * 1995-09-29 1998-09-29 Lucent Technologies Inc. Cascade echo canceler arrangement
US5825753A (en) * 1995-09-29 1998-10-20 Paradyne Corporation Echo canceler gain tracker for cellular modems
JP2842345B2 (ja) * 1995-11-29 1999-01-06 日本電気株式会社 エコーキャンセラ
US5978473A (en) * 1995-12-27 1999-11-02 Ericsson Inc. Gauging convergence of adaptive filters
US5848146A (en) * 1996-05-10 1998-12-08 Rane Corporation Audio system for conferencing/presentation room
US5796819A (en) * 1996-07-24 1998-08-18 Ericsson Inc. Echo canceller for non-linear circuits
DE69627359T2 (de) * 1996-08-01 2003-10-30 Nortel Networks Ltd., St. Laurent Verbesserter echokompensator mit anwendung in der digitalen telefonie
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
US6044068A (en) * 1996-10-01 2000-03-28 Telefonaktiebolaget Lm Ericsson Silence-improved echo canceller
US5838786A (en) * 1996-10-04 1998-11-17 Lucent Technologies, Inc. Intelligent acoustic systems peripheral
US6035034A (en) * 1996-12-20 2000-03-07 Telefonaktiebolaget L M Ericsson (Publ) Double talk and echo path change detection in a telephony system
JP3139405B2 (ja) * 1997-02-28 2001-02-26 日本電気株式会社 エコーキャンセラ
US6442273B1 (en) 1997-09-16 2002-08-27 Sanyo Electric Co., Ltd. Echo canceller and echo cancelling method
GB2330746B (en) * 1997-10-24 2002-07-17 Mitel Corp Double-talk insensitive NLMS algorithm
US6031908A (en) * 1997-11-14 2000-02-29 Tellabs Operations, Inc. Echo canceller employing dual-H architecture having variable adaptive gain settings
US6028929A (en) * 1997-11-14 2000-02-22 Tellabs Operations, Inc. Echo canceller employing dual-H architecture having improved non-linear echo path detection
KR100240626B1 (ko) * 1997-11-25 2000-01-15 정선종 디지털 이동 통신 시스템에서의 반향 제거 방법 및 장치
TW449993B (en) * 1999-12-17 2001-08-11 Winbond Electronics Corp Echo canceller
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
US7177416B1 (en) * 2002-04-27 2007-02-13 Fortemedia, Inc. Channel control and post filter for acoustic echo cancellation
US7046794B2 (en) * 2003-12-12 2006-05-16 Motorola, Inc. Double talk activity detector and method for an echo canceler circuit
US7099458B2 (en) * 2003-12-12 2006-08-29 Motorola, Inc. Downlink activity and double talk probability detector and method for an echo canceler circuit
US7894598B2 (en) * 2004-12-14 2011-02-22 Nuance Communications, Inc. System for limiting receive audio
JP4769161B2 (ja) * 2006-10-11 2011-09-07 日本電信電話株式会社 エコーキャンセラ装置、その方法、そのプログラム、およびその記録媒体
US8406415B1 (en) 2007-03-14 2013-03-26 Clearone Communications, Inc. Privacy modes in an open-air multi-port conferencing device
US8654955B1 (en) 2007-03-14 2014-02-18 Clearone Communications, Inc. Portable conferencing device with videoconferencing option
US8019076B1 (en) * 2007-03-14 2011-09-13 Clearone Communications, Inc. Portable speakerphone device and subsystem utilizing false doubletalk detection
US7912211B1 (en) 2007-03-14 2011-03-22 Clearone Communications, Inc. Portable speakerphone device and subsystem
US8077857B1 (en) 2007-03-14 2011-12-13 Clearone Communications, Inc. Portable speakerphone device with selective mixing
US8290142B1 (en) 2007-11-12 2012-10-16 Clearone Communications, Inc. Echo cancellation in a portable conferencing device with externally-produced audio
CN102131014A (zh) * 2010-01-13 2011-07-20 歌尔声学股份有限公司 时频域联合回声消除装置及方法
US9065895B2 (en) 2012-02-22 2015-06-23 Broadcom Corporation Non-linear echo cancellation
GB2532042B (en) * 2014-11-06 2017-02-08 Imagination Tech Ltd Pure delay estimation

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8423017D0 (en) * 1984-09-12 1984-10-17 Plessey Co Plc Echo canceller
GB8511835D0 (en) * 1985-05-10 1985-06-19 British Telecomm Adaptive digital filter
NL8600817A (nl) * 1986-03-28 1987-10-16 At & T & Philips Telecomm Adaptief filter voor het vormen van een echokompensatiesignaal in een zend-ontvangstelsel voor het in duplexvorm bedrijven van digitale communicatie over een enkel geleiderpaar.
US4868874A (en) * 1986-04-18 1989-09-19 Hitachi, Ltd. Echo canceller
EP0300427B1 (de) * 1987-07-20 1992-09-30 Nec Corporation Echokompensator
JPH0752859B2 (ja) * 1987-11-06 1995-06-05 日本電気株式会社 エコー除去装置
US4922530A (en) * 1988-03-18 1990-05-01 Tellabs, Inc. Adaptive filter with coefficient averaging and method
US5029167A (en) * 1989-09-13 1991-07-02 Northern Telecom Limited Coefficient storage reduction in adaptive filters in echo cancellers or decision feedback equalizers

Also Published As

Publication number Publication date
EP0508847A2 (de) 1992-10-14
EP0508847B1 (de) 1996-06-05
CA2062701A1 (en) 1992-09-15
DE69211211T2 (de) 1996-11-14
JPH04286218A (ja) 1992-10-12
US5263020A (en) 1993-11-16
CA2062701C (en) 1996-11-12
JP2836277B2 (ja) 1998-12-14
EP0508847A3 (en) 1993-05-05

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8328 Change in the person/name/address of the agent

Representative=s name: PATENTANWAELTE KNOBLAUCH UND KNOBLAUCH, 60322 FRANK

8339 Ceased/non-payment of the annual fee