DE69325357T2 - Eine Technik zur Reduzierung von Echos in Konferenzkommunikationen - Google Patents

Eine Technik zur Reduzierung von Echos in Konferenzkommunikationen

Info

Publication number
DE69325357T2
DE69325357T2 DE69325357T DE69325357T DE69325357T2 DE 69325357 T2 DE69325357 T2 DE 69325357T2 DE 69325357 T DE69325357 T DE 69325357T DE 69325357 T DE69325357 T DE 69325357T DE 69325357 T2 DE69325357 T2 DE 69325357T2
Authority
DE
Germany
Prior art keywords
technique
conference communications
reducing echoes
echoes
reducing
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
DE69325357T
Other languages
English (en)
Other versions
DE69325357D1 (de
Inventor
Alexander Feiner
Gi-Hong Im
Joseph George Kneuer
Burton Reuben Saltzberg
Jean-Jacques Werner
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.)
AT&T Corp
Original Assignee
AT&T 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
Application filed by AT&T Corp filed Critical AT&T Corp
Publication of DE69325357D1 publication Critical patent/DE69325357D1/de
Application granted granted Critical
Publication of DE69325357T2 publication Critical patent/DE69325357T2/de
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/56—Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/002—Applications of echo suppressors or cancellers in telephonic connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/56—Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities
    • H04M3/568—Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities audio processing specific to telephonic conferencing, e.g. spatial distribution, mixing of participants
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/40—Applications of speech amplifiers

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Telephonic Communication Services (AREA)
  • Filters That Use Time-Delay Elements (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
DE69325357T 1992-12-31 1993-12-06 Eine Technik zur Reduzierung von Echos in Konferenzkommunikationen Expired - Fee Related DE69325357T2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US99906392A 1992-12-31 1992-12-31

Publications (2)

Publication Number Publication Date
DE69325357D1 DE69325357D1 (de) 1999-07-22
DE69325357T2 true DE69325357T2 (de) 1999-12-16

Family

ID=25545852

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69325357T Expired - Fee Related DE69325357T2 (de) 1992-12-31 1993-12-06 Eine Technik zur Reduzierung von Echos in Konferenzkommunikationen

Country Status (5)

Country Link
US (1) US5363441A (de)
EP (1) EP0605960B1 (de)
JP (1) JPH06244760A (de)
CA (1) CA2102857C (de)
DE (1) DE69325357T2 (de)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6594688B2 (en) 1993-10-01 2003-07-15 Collaboration Properties, Inc. Dedicated echo canceler for a workstation
US5689641A (en) * 1993-10-01 1997-11-18 Vicor, Inc. Multimedia collaboration system arrangement for routing compressed AV signal through a participant site without decompressing the AV signal
GB9514553D0 (en) * 1995-07-17 1995-09-13 Hong Kong Telecommunications L Loudspeaking telephone systems
US5666407A (en) * 1995-12-05 1997-09-09 Ncr Corporation Software-based bridging system for full duplex audio telephone conferencing
US5907497A (en) * 1995-12-28 1999-05-25 Lucent Technologies Inc. Update block for an adaptive equalizer filter configuration
US5754631A (en) * 1996-09-30 1998-05-19 Intervoice Limited Partnership Voice response unit having robot conference capability on ports
US5805696A (en) * 1996-12-09 1998-09-08 Lucent Technologies, Inc. Echo canceller adaptation technique
AU3430199A (en) * 1998-04-08 1999-11-01 British Telecommunications Public Limited Company Echo cancellation
DE19850271A1 (de) * 1998-10-31 2000-05-04 Alcatel Sa Verfahren zur Bestimmung eines Echokopplungsfaktors und der Echolaufzeit in einem bidirektionalen Telekommunikationssystem
FI112016B (fi) * 2001-12-20 2003-10-15 Nokia Corp Konferenssipuhelujärjestely
WO2008133686A1 (en) * 2007-04-27 2008-11-06 Hewlett-Packard Development Company, L.P. System and method of calibrating an echo canceller using preemptive tone sequencing
US8509460B2 (en) 2008-02-04 2013-08-13 Nec Corporation Sound mixing apparatus and method and multipoint conference server
EP2239931A4 (de) * 2008-02-04 2012-01-11 Nec Corp Sprachmischgerät und -verfahren und mehrpunkt-konferenzserver
US8724798B2 (en) 2009-11-20 2014-05-13 Adobe Systems Incorporated System and method for acoustic echo cancellation using spectral decomposition
RU2623496C2 (ru) * 2011-12-06 2017-06-27 Филипс Лайтинг Холдинг Б.В. Протоколы для передачи данных кодированным светом

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4456789A (en) * 1978-03-07 1984-06-26 The Post Office Audio teleconferencing
US4600815A (en) * 1982-07-30 1986-07-15 Communications Satellite Corporation Automatic gain control for echo cancellers and similar adaptive systems
DE3306995A1 (de) * 1983-02-28 1984-08-30 Siemens AG, 1000 Berlin und 8000 München Schaltungsanordnung fuer fernmeldevermittlungsanlagen, insbesondere pcm-fernsprechvermittlungsanlagen, mit konferenzschaltungen
JPS60226262A (ja) * 1984-04-25 1985-11-11 Fujitsu Ltd 会議電話呼出制御方式
DE3427303A1 (de) * 1984-07-20 1986-01-30 Siemens AG, 1000 Berlin und 8000 München Konferenzschaltung fuer digitale kommunikationssysteme
US4901308A (en) * 1986-12-08 1990-02-13 Dsc Communications Corporation Digital bridge for a time slot interchange digital switched matrix
JP2637106B2 (ja) * 1987-07-24 1997-08-06 日本電信電話株式会社 音声会議装置
JPH01319360A (ja) * 1988-06-20 1989-12-25 Nec Corp 音声会議装置
US4991166A (en) * 1988-10-28 1991-02-05 Shure Brothers Incorporated Echo reduction circuit
JP2785336B2 (ja) * 1989-06-13 1998-08-13 日本電気株式会社 音響エコーキャンセラのトレーニング方式

Also Published As

Publication number Publication date
JPH06244760A (ja) 1994-09-02
DE69325357D1 (de) 1999-07-22
CA2102857A1 (en) 1994-07-01
US5363441A (en) 1994-11-08
CA2102857C (en) 1998-06-23
EP0605960A1 (de) 1994-07-13
EP0605960B1 (de) 1999-06-16

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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