DE3877384D1 - Einrichtung zur realisierung der freisprechfunktion in einem fernsprechapparat mit assoziierung der verstaerkungsschaltungs- und echoannullierungs-funktionen. - Google Patents

Einrichtung zur realisierung der freisprechfunktion in einem fernsprechapparat mit assoziierung der verstaerkungsschaltungs- und echoannullierungs-funktionen.

Info

Publication number
DE3877384D1
DE3877384D1 DE8888400462T DE3877384T DE3877384D1 DE 3877384 D1 DE3877384 D1 DE 3877384D1 DE 8888400462 T DE8888400462 T DE 8888400462T DE 3877384 T DE3877384 T DE 3877384T DE 3877384 D1 DE3877384 D1 DE 3877384D1
Authority
DE
Germany
Prior art keywords
realizing
association
amplification circuit
telephone set
echo canceling
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
DE8888400462T
Other languages
English (en)
Other versions
DE3877384T2 (de
Inventor
Jean-Louis Connan
Jean-Yves Huiban
Serge Pinaud
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.)
Orange SA
Original Assignee
France Telecom SA
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=9348539&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=DE3877384(D1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by France Telecom SA filed Critical France Telecom SA
Application granted granted Critical
Publication of DE3877384D1 publication Critical patent/DE3877384D1/de
Publication of DE3877384T2 publication Critical patent/DE3877384T2/de
Anticipated expiration legal-status Critical
Expired - Fee Related 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
DE8888400462T 1987-03-03 1988-02-29 Einrichtung zur realisierung der freisprechfunktion in einem fernsprechapparat mit assoziierung der verstaerkungsschaltungs- und echoannullierungs-funktionen. Expired - Fee Related DE3877384T2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8702850A FR2612029B1 (fr) 1987-03-03 1987-03-03 Dispositif pour la realisation de la fonction " mains-libres " dans un poste telephonique, associant les fonctions de commutation de gain et d'annulation d'echo

Publications (2)

Publication Number Publication Date
DE3877384D1 true DE3877384D1 (de) 1993-02-25
DE3877384T2 DE3877384T2 (de) 1993-05-19

Family

ID=9348539

Family Applications (1)

Application Number Title Priority Date Filing Date
DE8888400462T Expired - Fee Related DE3877384T2 (de) 1987-03-03 1988-02-29 Einrichtung zur realisierung der freisprechfunktion in einem fernsprechapparat mit assoziierung der verstaerkungsschaltungs- und echoannullierungs-funktionen.

Country Status (6)

Country Link
US (1) US4984265A (de)
EP (1) EP0282393B1 (de)
JP (1) JP2620285B2 (de)
CA (1) CA1288186C (de)
DE (1) DE3877384T2 (de)
FR (1) FR2612029B1 (de)

Families Citing this family (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3839627C2 (de) * 1988-11-24 1995-03-16 Philips Patentverwaltung Fernsprechendgerät
US5016271A (en) * 1989-05-30 1991-05-14 At&T Bell Laboratories Echo canceler-suppressor speakerphone
FR2651077B1 (fr) * 1989-08-18 1994-06-10 Letourneur Gregoire Dispositif de traitement d'echo notamment acoustique dans une ligne telephonique
GB2240452A (en) * 1990-01-10 1991-07-31 Motorola Inc Echo canceller has plurality of sub-band channels each with its own adaptive filter
GB2245459A (en) * 1990-06-20 1992-01-02 Motorola Inc Echo canceller with adaptive voice switch attenuation
US5075687A (en) * 1990-09-27 1991-12-24 Advanced Micro Devices, Inc. Echo suppression with both digital and analog variable attenuators
US5170430A (en) * 1991-01-04 1992-12-08 Schuh Peter O Voice-switched handset receive amplifier
FR2676881A1 (fr) * 1991-05-21 1992-11-27 Telecommunications Sa Procede pour optimiser la qualite des communications telephoniques.
EP0601082A4 (en) * 1991-08-30 1996-05-15 Digital Sound Corp Adaptive echo canceller for voice messaging system.
US5353347A (en) * 1992-02-04 1994-10-04 Acs Communications, Inc. Telephone headset amplifier with battery saver, receive line noise reduction, and click-free mute switching
US5365583A (en) * 1992-07-02 1994-11-15 Polycom, Inc. Method for fail-safe operation in a speaker phone system
DE4236408A1 (de) * 1992-10-28 1994-05-05 Siemens Ag Schaltbare Dämpfungsvorrichtung
JPH06216811A (ja) * 1993-01-20 1994-08-05 Toshiba Corp エコーキャンセラを備えた音声通信装置
JPH06232957A (ja) * 1993-01-29 1994-08-19 Toshiba Corp 音声通信装置
FR2704110B1 (fr) * 1993-04-16 1995-07-13 Balestro Freddy Dispositif de traitement de signaux utilisant plusieurs filtrages differents, notamment pour le codage audiofrequence de signaux vocaux.
JPH06338829A (ja) * 1993-05-28 1994-12-06 American Teleph & Telegr Co <Att> 通信システム内の反響除去方法と装置
JPH07297900A (ja) * 1994-04-26 1995-11-10 Mitsubishi Electric Corp 騒音対策通話機
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
DE4445877A1 (de) * 1994-12-22 1996-06-27 Philips Patentverwaltung Verfahren und Anordnung zur Echokompensation
JP2928130B2 (ja) * 1995-04-19 1999-08-03 埼玉日本電気株式会社 ハンズフリー通信装置
US5612996A (en) * 1995-09-21 1997-03-18 Rockwell International Corporation Loop gain processing system for speakerphone applications
US5668794A (en) * 1995-09-29 1997-09-16 Crystal Semiconductor Variable gain echo suppressor
DE19537772A1 (de) * 1995-10-11 1997-04-17 Sel Alcatel Ag Freisprecheinrichtung für ein Fernsprechendgerät
DE19538187A1 (de) * 1995-10-13 1997-04-17 Sel Alcatel Ag Verfahren und Schaltungsanordnung zur Detektion von Sprache eines fernen Sprechers in einem Fernsprechendgerät
US5892823A (en) * 1996-03-27 1999-04-06 Hello Direct, Inc. Smart interface technology
CN1166160C (zh) * 1996-05-31 2004-09-08 皇家菲利浦电子有限公司 抑制输入信号中干扰成分的设备
US5787165A (en) * 1996-12-13 1998-07-28 Ericsson Inc. Handsfree radiotelephone having dynamic path attenuation control for echo suppression
FR2759835A1 (fr) * 1997-02-17 1998-08-21 Thomson Multimedia Sa Procede de compensation des attenuations affectant les niveaux des signaux echanges dans un reseau de communication
US6178162B1 (en) * 1997-12-19 2001-01-23 Nortel Networks Corporation Method and apparatus for inhibiting echo in a channel of a communication system
KR100283170B1 (ko) 1998-11-04 2001-03-02 윤종용 반향제거 장치 및 방법
US6487178B1 (en) 1999-05-12 2002-11-26 Ericsson Inc. Methods and apparatus for providing volume control in communicating systems including a linear echo canceler
US7092513B1 (en) * 2004-07-01 2006-08-15 Plantronics, Inc. Limiting maximum gain in duplex communications devices including telephone sets
US8199927B1 (en) * 2007-10-31 2012-06-12 ClearOnce Communications, Inc. Conferencing system implementing echo cancellation and push-to-talk microphone detection using two-stage frequency filter

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1108415A (en) * 1966-05-06 1968-04-03 Int Standard Electric Corp Echo suppression in long distance telephone circuits
US3499999A (en) * 1966-10-31 1970-03-10 Bell Telephone Labor Inc Closed loop adaptive echo canceller using generalized filter networks
US4346261A (en) * 1980-03-17 1982-08-24 United Networks, Inc. Speaker phones
DE3116863C2 (de) * 1981-04-28 1985-08-08 Siemens AG, 1000 Berlin und 8000 München Schaltungsanordnung zur Digitalsignal-Echokompensation
JPS5842345A (ja) * 1981-09-08 1983-03-11 Nippon Telegr & Teleph Corp <Ntt> ハウリング防止装置
JPS5862132U (ja) * 1981-10-21 1983-04-26 スズキ株式会社 内燃機関における排気制御装置
JPS592919U (ja) * 1982-06-29 1984-01-10 トヨタ自動車株式会社 可変周波数型レゾネ−タ
GB2137458B (en) * 1983-03-01 1986-11-19 Standard Telephones Cables Ltd Digital handsfree telephone
JPS6032931A (ja) * 1983-08-01 1985-02-20 Moriwaki Eng:Kk 多気筒エンジン用排気管
JPS6041849A (ja) * 1983-08-18 1985-03-05 Toshiba Corp 拡声電話
JPS6097732A (ja) * 1983-11-02 1985-05-31 Toshiba Corp 反響信号除去装置
JPS60133129U (ja) * 1984-02-15 1985-09-05 スズキ株式会社 エンジンの排気ガス膨脹室
US4747132A (en) * 1984-04-09 1988-05-24 Matsushita Electric Industrial Co., Ltd. Howling canceller
JPS60185029U (ja) * 1984-05-21 1985-12-07 スズキ株式会社 エンジンの排気チヤンバ−
US4712235A (en) * 1984-11-19 1987-12-08 International Business Machines Corporation Method and apparatus for improved control and time sharing of an echo canceller
US4629829A (en) * 1984-12-14 1986-12-16 Motorola, Inc. Full duplex speakerphone for radio and landline telephones
JPH0771026B2 (ja) * 1985-03-04 1995-07-31 株式会社東芝 反響信号打消し装置
JPH0629548B2 (ja) * 1985-03-18 1994-04-20 ヤマハ発動機株式会社 多気筒エンジンの排気装置
JPS62184137U (de) * 1986-05-14 1987-11-21

Also Published As

Publication number Publication date
JPS63299436A (ja) 1988-12-06
US4984265A (en) 1991-01-08
DE3877384T2 (de) 1993-05-19
FR2612029B1 (fr) 1989-05-12
EP0282393B1 (de) 1993-01-13
JP2620285B2 (ja) 1997-06-11
CA1288186C (en) 1991-08-27
FR2612029A1 (fr) 1988-09-09
EP0282393A1 (de) 1988-09-14

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Legal Events

Date Code Title Description
8363 Opposition against the patent
8365 Fully valid after opposition proceedings
8339 Ceased/non-payment of the annual fee