GB9013751D0 - Echo canceller with adaptive voice switch attenuation - Google Patents

Echo canceller with adaptive voice switch attenuation

Info

Publication number
GB9013751D0
GB9013751D0 GB909013751A GB9013751A GB9013751D0 GB 9013751 D0 GB9013751 D0 GB 9013751D0 GB 909013751 A GB909013751 A GB 909013751A GB 9013751 A GB9013751 A GB 9013751A GB 9013751 D0 GB9013751 D0 GB 9013751D0
Authority
GB
United Kingdom
Prior art keywords
echo canceller
voice switch
adaptive voice
switch attenuation
attenuation
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.)
Withdrawn
Application number
GB909013751A
Other versions
GB2245459A (en
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.)
Motorola Solutions Inc
Original Assignee
Motorola 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 Motorola Inc filed Critical Motorola Inc
Priority to GB9013751A priority Critical patent/GB2245459A/en
Publication of GB9013751D0 publication Critical patent/GB9013751D0/en
Priority to AU79681/91A priority patent/AU7968191A/en
Priority to PCT/EP1991/001130 priority patent/WO1991020149A1/en
Priority to IE210291A priority patent/IE912102A1/en
Publication of GB2245459A publication Critical patent/GB2245459A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • H04B3/234—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 double talk detection

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
GB9013751A 1990-06-20 1990-06-20 Echo canceller with adaptive voice switch attenuation Withdrawn GB2245459A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB9013751A GB2245459A (en) 1990-06-20 1990-06-20 Echo canceller with adaptive voice switch attenuation
AU79681/91A AU7968191A (en) 1990-06-20 1991-06-19 Echo canceller with adaptive voice switch attenuation
PCT/EP1991/001130 WO1991020149A1 (en) 1990-06-20 1991-06-19 Echo canceller with adaptive voice switch attenuation
IE210291A IE912102A1 (en) 1990-06-20 1991-06-19 Echo canceller with adaptive voice switch attenuation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9013751A GB2245459A (en) 1990-06-20 1990-06-20 Echo canceller with adaptive voice switch attenuation

Publications (2)

Publication Number Publication Date
GB9013751D0 true GB9013751D0 (en) 1990-08-08
GB2245459A GB2245459A (en) 1992-01-02

Family

ID=10677919

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9013751A Withdrawn GB2245459A (en) 1990-06-20 1990-06-20 Echo canceller with adaptive voice switch attenuation

Country Status (4)

Country Link
AU (1) AU7968191A (en)
GB (1) GB2245459A (en)
IE (1) IE912102A1 (en)
WO (1) WO1991020149A1 (en)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5157653A (en) * 1990-08-03 1992-10-20 Coherent Communications Systems Corp. Residual echo elimination with proportionate noise injection
US5263019A (en) * 1991-01-04 1993-11-16 Picturetel Corporation Method and apparatus for estimating the level of acoustic feedback between a loudspeaker and microphone
FI89756C (en) * 1991-11-04 1993-11-10 Nokia Telecommunications Oy FOERFARANDE FOER OLINEAER SIGNALBEHANDLING I EN EKOSLAECKARE
ES2101633B1 (en) * 1994-05-31 1998-03-01 Alcatel Standard Electrica FIXED CELL PHONE TERMINAL FOR TWO-WIRE TELECOMMUNICATION SERVICES.
JPH0832494A (en) * 1994-07-13 1996-02-02 Mitsubishi Electric Corp Hand-free talking device
ES2101638B1 (en) * 1994-09-30 1998-03-01 Alcatel Standard Electrica FIXED CELL PHONE TERMINAL FOR TWO-WIRE TELECOMMUNICATION SERVICES.
US5835851A (en) * 1995-01-19 1998-11-10 Ericsson Inc. Method and apparatus for echo reduction in a hands-free cellular radio using added noise frames
JP2928130B2 (en) * 1995-04-19 1999-08-03 埼玉日本電気株式会社 Hands-free communication device
FR2748174B1 (en) * 1996-04-30 1998-06-26 Sagem HANDS-FREE TELEPHONE SET
DE19639580C2 (en) * 1996-09-26 1998-09-17 Deutsche Telekom Ag Device for reducing acoustic echoes
JP4261622B2 (en) * 1997-01-23 2009-04-30 モトローラ・インコーポレイテッド Non-linear processing apparatus and method in communication system
JP3597671B2 (en) * 1997-05-16 2004-12-08 三菱電機株式会社 Handsfree phone
US6580793B1 (en) 1999-08-31 2003-06-17 Lucent Technologies Inc. Method and apparatus for echo cancellation with self-deactivation
JP3576430B2 (en) 1999-09-01 2004-10-13 沖電気工業株式会社 Automatic gain controller
US6507653B1 (en) * 2000-04-14 2003-01-14 Ericsson Inc. Desired voice detection in echo suppression
DE10030926A1 (en) * 2000-06-24 2002-01-03 Alcatel Sa Interference-dependent adaptive echo cancellation
US6622030B1 (en) * 2000-06-29 2003-09-16 Ericsson Inc. Echo suppression using adaptive gain based on residual echo energy
FR2816791A1 (en) * 2000-11-15 2002-05-17 Atlinks Telephone loudspeaker unit echo limiting system having signal intensity set during receiver output transmission following set level base noise/parasitics determined.
JP4282260B2 (en) 2001-11-20 2009-06-17 株式会社リコー Echo canceller
US9973633B2 (en) 2014-11-17 2018-05-15 At&T Intellectual Property I, L.P. Pre-distortion system for cancellation of nonlinear distortion in mobile devices

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4346261A (en) * 1980-03-17 1982-08-24 United Networks, Inc. Speaker phones
JPS6041849A (en) * 1983-08-18 1985-03-05 Toshiba Corp Loudspeaker telephone set
FR2612029B1 (en) * 1987-03-03 1989-05-12 Connan Jean Louis DEVICE FOR REALIZING THE "HANDSFREE" FUNCTION IN A TELEPHONE SET, COMBINING THE GAIN SWITCHING AND ECHO CANCELLATION FUNCTIONS

Also Published As

Publication number Publication date
WO1991020149A1 (en) 1991-12-26
GB2245459A (en) 1992-01-02
AU7968191A (en) 1992-01-07
IE912102A1 (en) 1992-01-01

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)