DE69129719D1 - Sprechvorrichtung mit einer wechselseitigen freisprechfunktion - Google Patents

Sprechvorrichtung mit einer wechselseitigen freisprechfunktion

Info

Publication number
DE69129719D1
DE69129719D1 DE69129719T DE69129719T DE69129719D1 DE 69129719 D1 DE69129719 D1 DE 69129719D1 DE 69129719 T DE69129719 T DE 69129719T DE 69129719 T DE69129719 T DE 69129719T DE 69129719 D1 DE69129719 D1 DE 69129719D1
Authority
DE
Germany
Prior art keywords
free function
talking device
alternative hands
hands
alternative
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
DE69129719T
Other languages
English (en)
Other versions
DE69129719T2 (de
Inventor
Juro Ohga
Hiroyuki Masuda
Kensaku Fujii
Yoshihiro Sakai
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.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
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 Fujitsu Ltd filed Critical Fujitsu Ltd
Publication of DE69129719D1 publication Critical patent/DE69129719D1/de
Application granted granted Critical
Publication of DE69129719T2 publication Critical patent/DE69129719T2/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
DE69129719T 1990-02-16 1991-02-16 Sprechvorrichtung mit einer wechselseitigen freisprechfunktion Expired - Fee Related DE69129719T2 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP3566090 1990-02-16
JP3785390 1990-02-19
PCT/JP1991/000192 WO1991012683A1 (fr) 1990-02-16 1991-02-16 Dispositif de transmission de parole a fonction conversationnelle mains libres

Publications (2)

Publication Number Publication Date
DE69129719D1 true DE69129719D1 (de) 1998-08-13
DE69129719T2 DE69129719T2 (de) 1999-01-14

Family

ID=26374660

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69129719T Expired - Fee Related DE69129719T2 (de) 1990-02-16 1991-02-16 Sprechvorrichtung mit einer wechselseitigen freisprechfunktion

Country Status (6)

Country Link
US (1) US5479502A (de)
EP (1) EP0471083B1 (de)
JP (1) JP3047300B2 (de)
CA (1) CA2056455C (de)
DE (1) DE69129719T2 (de)
WO (1) WO1991012683A1 (de)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5404397A (en) * 1992-04-16 1995-04-04 U.S. Phillips Corporation Conference system with automatic speaker detection and speaker unit
SE9501681D0 (sv) * 1995-04-07 1995-05-05 Konftel Ab Teleanordning
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
JPH09289474A (ja) * 1996-04-23 1997-11-04 Saitama Nippon Denki Kk ハンズフリー通話装置
EP0853844B1 (de) * 1996-08-01 2003-04-09 Nortel Networks Limited Verbesserter echokompensator mit anwendung in der digitalen telefonie
DE19639702C2 (de) * 1996-09-26 2000-11-16 Siemens Ag Verfahren und Anordnung zur Begrenzung des Restechos
EP1022865B1 (de) * 1997-09-16 2011-03-30 Sanyo Electric Co., Ltd. Echounterdrücker und echounterdrückungsverfahren
DE19753224C2 (de) * 1997-12-01 2000-05-25 Deutsche Telekom Ag Verfahren und Vorrichtung zur Echounterdrückung bei einer Freisprecheinrichtung, insbesondere für ein Telefon
KR100279825B1 (ko) * 1998-12-23 2001-02-01 윤종용 교환기에서 에코 및 측음 현상을 제거하는 회로
DE10030548A1 (de) * 2000-06-21 2002-01-03 Alcatel Sa Telefonieren und Freisprechen für schnurlose Endgeräte mit Echokompensation
US6785382B2 (en) * 2001-02-12 2004-08-31 Signalworks, Inc. System and method for controlling a filter to enhance speakerphone performance
WO2009028023A1 (ja) * 2007-08-24 2009-03-05 Fujitsu Limited エコー抑制装置、エコー抑制システム、エコー抑制方法及びコンピュータプログラム
JP5189515B2 (ja) * 2009-01-29 2013-04-24 アイホン株式会社 インターホンシステム
US8478359B2 (en) * 2010-06-04 2013-07-02 Apple Inc. User interface tone echo cancellation

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS561649A (en) * 1979-06-19 1981-01-09 Nec Corp Conference telephone equipment
JPS61206354A (ja) * 1985-03-09 1986-09-12 Nec Corp 反響消去形会議通話装置
US4636586A (en) * 1985-09-20 1987-01-13 Rca Corporation Speakerphone with adaptive cancellation of room echoes
WO1988002582A1 (en) * 1986-10-01 1988-04-07 Racal Data Communications Inc. Echo canceller with adaptive dynamically positioned taps
JPS6424657A (en) * 1987-07-21 1989-01-26 Nippon Telegraph & Telephone Voice conference equipment
AT391784B (de) * 1987-11-25 1990-11-26 Siemens Ag Oesterreich Verfahren zur adaptiven kompensation eines echos in einer kommunikationseinrichtung
FR2628918B1 (fr) * 1988-03-15 1990-08-10 France Etat Dispositif annuleur d'echo a filtrage en sous-bandes de frequence
JPH01319360A (ja) * 1988-06-20 1989-12-25 Nec Corp 音声会議装置
US4912758A (en) * 1988-10-26 1990-03-27 International Business Machines Corporation Full-duplex digital speakerphone
US4947425A (en) * 1989-10-27 1990-08-07 At&T Bell Laboratories Echo measurement arrangement

Also Published As

Publication number Publication date
EP0471083A1 (de) 1992-02-19
DE69129719T2 (de) 1999-01-14
WO1991012683A1 (fr) 1991-08-22
JP3047300B2 (ja) 2000-05-29
EP0471083B1 (de) 1998-07-08
CA2056455C (en) 1996-06-11
US5479502A (en) 1995-12-26
EP0471083A4 (en) 1993-09-01

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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