DE69221949T2 - Verfahren und Einrichtung zur Echokompensation in einem digitalen Fernmeldesystem - Google Patents

Verfahren und Einrichtung zur Echokompensation in einem digitalen Fernmeldesystem

Info

Publication number
DE69221949T2
DE69221949T2 DE69221949T DE69221949T DE69221949T2 DE 69221949 T2 DE69221949 T2 DE 69221949T2 DE 69221949 T DE69221949 T DE 69221949T DE 69221949 T DE69221949 T DE 69221949T DE 69221949 T2 DE69221949 T2 DE 69221949T2
Authority
DE
Germany
Prior art keywords
telecommunications system
echo cancellation
digital telecommunications
digital
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
DE69221949T
Other languages
English (en)
Other versions
DE69221949D1 (de
Inventor
Hideo Sano
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
Priority claimed from JP4109419A external-priority patent/JP2988119B2/ja
Application filed by NEC Corp filed Critical NEC Corp
Publication of DE69221949D1 publication Critical patent/DE69221949D1/de
Application granted granted Critical
Publication of DE69221949T2 publication Critical patent/DE69221949T2/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
DE69221949T 1991-06-13 1992-06-15 Verfahren und Einrichtung zur Echokompensation in einem digitalen Fernmeldesystem Expired - Fee Related DE69221949T2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP16881891 1991-06-13
JP4109419A JP2988119B2 (ja) 1991-06-13 1992-04-28 反響抑圧装置

Publications (2)

Publication Number Publication Date
DE69221949D1 DE69221949D1 (de) 1997-10-09
DE69221949T2 true DE69221949T2 (de) 1998-04-02

Family

ID=26449171

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69221949T Expired - Fee Related DE69221949T2 (de) 1991-06-13 1992-06-15 Verfahren und Einrichtung zur Echokompensation in einem digitalen Fernmeldesystem

Country Status (5)

Country Link
US (1) US5313498A (de)
EP (1) EP0518383B1 (de)
AU (1) AU659842B2 (de)
CA (1) CA2071241C (de)
DE (1) DE69221949T2 (de)

Families Citing this family (45)

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Publication number Priority date Publication date Assignee Title
US5307405A (en) * 1992-09-25 1994-04-26 Qualcomm Incorporated Network echo canceller
US5410595A (en) * 1992-11-12 1995-04-25 Motorola, Inc. Apparatus and method for noise reduction for a full-duplex speakerphone or the like
WO1994014248A1 (en) * 1992-12-07 1994-06-23 Telstra Corporation Limited Far end echo canceller
US5812534A (en) 1993-01-08 1998-09-22 Multi-Tech Systems, Inc. Voice over data conferencing for a computer-based personal communications system
US5546395A (en) 1993-01-08 1996-08-13 Multi-Tech Systems, Inc. Dynamic selection of compression rate for a voice compression algorithm in a voice over data modem
US6009082A (en) 1993-01-08 1999-12-28 Multi-Tech Systems, Inc. Computer-based multifunction personal communication system with caller ID
US5864560A (en) 1993-01-08 1999-01-26 Multi-Tech Systems, Inc. Method and apparatus for mode switching in a voice over data computer-based personal communications system
US5453986A (en) 1993-01-08 1995-09-26 Multi-Tech Systems, Inc. Dual port interface for a computer-based multifunction personal communication system
US5535204A (en) 1993-01-08 1996-07-09 Multi-Tech Systems, Inc. Ringdown and ringback signalling for a computer-based multifunction personal communications system
US5617423A (en) 1993-01-08 1997-04-01 Multi-Tech Systems, Inc. Voice over data modem with selectable voice compression
US5452289A (en) 1993-01-08 1995-09-19 Multi-Tech Systems, Inc. Computer-based multifunction personal communications system
JPH06232957A (ja) * 1993-01-29 1994-08-19 Toshiba Corp 音声通信装置
JPH07264279A (ja) * 1994-03-18 1995-10-13 Nec Corp エコーキャンセラ装置
US5682386A (en) 1994-04-19 1997-10-28 Multi-Tech Systems, Inc. Data/voice/fax compression multiplexer
US5757801A (en) 1994-04-19 1998-05-26 Multi-Tech Systems, Inc. Advanced priority statistical multiplexer
US5668871A (en) * 1994-04-29 1997-09-16 Motorola, Inc. Audio signal processor and method therefor for substantially reducing audio feedback in a cummunication unit
DE4426226A1 (de) * 1994-07-23 1996-01-25 Philips Patentverwaltung Schaltungsanordnung zum Übertragen von codierten Sprachsignalen
WO1996014694A1 (en) * 1994-11-04 1996-05-17 Sierra Semiconductor Corporation Method and apparatus for establishing full-duplex sound communication for a speakerphone system
JP2765494B2 (ja) * 1994-11-09 1998-06-18 日本電気株式会社 ２線式音声会議装置
US5587998A (en) * 1995-03-03 1996-12-24 At&T Method and apparatus for reducing residual far-end echo in voice communication networks
US5657384A (en) * 1995-03-10 1997-08-12 Tandy Corporation Full duplex speakerphone
US5691978A (en) * 1995-04-07 1997-11-25 Signal Science, Inc. Self-cancelling full-duplex RF communication system
US5636272A (en) * 1995-05-30 1997-06-03 Ericsson Inc. Apparatus amd method for increasing the intelligibility of a loudspeaker output and for echo cancellation in telephones
US5631899A (en) * 1995-05-31 1997-05-20 Lucent Technologies Inc. Acoustic echo canceler
US5663955A (en) * 1995-08-25 1997-09-02 Lucent Technologies Inc. Echo canceller system with shared coefficient memory
US5675644A (en) * 1995-09-26 1997-10-07 Qualcomm Incorporated Method and apparatus for canceling echo accounting for delay variations
US5887059A (en) * 1996-01-30 1999-03-23 Advanced Micro Devices, Inc. System and method for performing echo cancellation in a communications network employing a mixed mode LMS adaptive balance filter
US6021194A (en) * 1996-03-28 2000-02-01 At&T Corp. Flash-cut of speech processing features in a telephone call
US5787165A (en) * 1996-12-13 1998-07-28 Ericsson Inc. Handsfree radiotelephone having dynamic path attenuation control for echo suppression
US6453043B1 (en) 1996-12-18 2002-09-17 At&T Corp. Flash-cut of speech processing features in a telephone call
JP3139405B2 (ja) * 1997-02-28 2001-02-26 日本電気株式会社 エコーキャンセラ
FI981091A (fi) 1998-05-15 1999-11-16 Nokia Networks Oy Menetelmä ja laitteisto kaiun poistamiseksi digitaalisessa matkaviestinjärjestelmässä
KR100279825B1 (ko) * 1998-12-23 2001-02-01 윤종용 교환기에서 에코 및 측음 현상을 제거하는 회로
US6643271B1 (en) * 1999-04-30 2003-11-04 3Com Corporation Adjustable gain transmit cancellation in a full-duplex modem data access arrangement (DAA)
US6678254B1 (en) 1999-05-03 2004-01-13 Nortel Networks Limited Method and communication device for optimizing echo cancellation
AU1359601A (en) 1999-11-03 2001-05-14 Tellabs Operations, Inc. Integrated voice processing system for packet networks
US6826279B1 (en) 2000-05-25 2004-11-30 3Com Corporation Base band echo cancellation using laguerre echo estimation
FR2828327B1 (fr) * 2000-10-03 2003-12-12 France Telecom Procede et dispositif de reduction d'echo
JP3693588B2 (ja) * 2000-11-01 2005-09-07 富士通株式会社 エコー抑制システム
US7046792B2 (en) * 2001-03-09 2006-05-16 Acoustic Technologies, Inc. Transmit/receive arbitrator
US6839427B2 (en) * 2001-12-20 2005-01-04 Motorola, Inc. Method and apparatus for echo canceller automatic gain control
US7058368B2 (en) * 2002-06-27 2006-06-06 Nortel Networks Limited Adaptive feedforward noise cancellation circuit
US7199498B2 (en) 2003-06-02 2007-04-03 Ambient Systems, Inc. Electrical assemblies using molecular-scale electrically conductive and mechanically flexible beams and methods for application of same
GB2525947B (en) * 2014-10-31 2016-06-22 Imagination Tech Ltd Automatic tuning of a gain controller
DE102016104290A1 (de) 2016-03-09 2017-09-14 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Verwaltungssteuergerät für ein Fahrzeug

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4554417A (en) * 1983-02-04 1985-11-19 At&T Bell Laboratories Tandem adaptive echo canceler arrangement
DE3586696T2 (de) * 1984-05-30 1993-04-01 Hitachi Ltd Pcm-coder/decoder mit zweidraht/vierdrahtumwandlung.
DE3585034D1 (de) * 1985-10-30 1992-02-06 Ibm Verfahren zur bestimmung einer flachen echopfadverzoegerung und dieses verfahren verwendender echokompensator.
NL8600087A (nl) * 1986-01-17 1987-08-17 Philips Nv Inrichting voor vol-duplex datatransmissie over tweedraadsverbindingen.
JPH07123235B2 (ja) * 1986-08-13 1995-12-25 株式会社日立製作所 エコ−サプレツサ
JPH0650829B2 (ja) * 1986-09-16 1994-06-29 日本電気株式会社 エコ−キヤンセラ方式モデム
US5163044A (en) * 1991-01-02 1992-11-10 At&T Bell Laboratories Use of a fractionally spaced equalizer to perform echo cancellation in a full-duplex modem

Also Published As

Publication number Publication date
DE69221949D1 (de) 1997-10-09
EP0518383B1 (de) 1997-09-03
CA2071241A1 (en) 1992-12-14
US5313498A (en) 1994-05-17
AU1826192A (en) 1992-12-17
AU659842B2 (en) 1995-06-01
CA2071241C (en) 1997-04-15
EP0518383A3 (en) 1993-08-04
EP0518383A2 (de) 1992-12-16

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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