DE3887821D1 - Echokompensator. - Google Patents

Echokompensator.

Info

Publication number
DE3887821D1
DE3887821D1 DE88118419T DE3887821T DE3887821D1 DE 3887821 D1 DE3887821 D1 DE 3887821D1 DE 88118419 T DE88118419 T DE 88118419T DE 3887821 T DE3887821 T DE 3887821T DE 3887821 D1 DE3887821 D1 DE 3887821D1
Authority
DE
Germany
Prior art keywords
echo canceller
canceller
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
DE88118419T
Other languages
English (en)
Other versions
DE3887821T2 (de
Inventor
Fujio C O Nec Corpora Nakagawa
Akira C O Nec Corpora Kanemasa
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
Application filed by NEC Corp filed Critical NEC Corp
Publication of DE3887821D1 publication Critical patent/DE3887821D1/de
Application granted granted Critical
Publication of DE3887821T2 publication Critical patent/DE3887821T2/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
    • H04B3/237—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 two adaptive filters, e.g. for near end and for end echo cancelling
    • 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
    • H04B3/238—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 initial training sequence

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
DE3887821T 1987-11-06 1988-11-04 Echokompensator. Expired - Fee Related DE3887821T2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62281331A JPH0752859B2 (ja) 1987-11-06 1987-11-06 エコー除去装置

Publications (2)

Publication Number Publication Date
DE3887821D1 true DE3887821D1 (de) 1994-03-24
DE3887821T2 DE3887821T2 (de) 1994-05-19

Family

ID=17637614

Family Applications (1)

Application Number Title Priority Date Filing Date
DE3887821T Expired - Fee Related DE3887821T2 (de) 1987-11-06 1988-11-04 Echokompensator.

Country Status (6)

Country Link
US (1) US4965823A (de)
EP (1) EP0315191B1 (de)
JP (1) JPH0752859B2 (de)
AU (1) AU613418B2 (de)
CA (1) CA1329833C (de)
DE (1) DE3887821T2 (de)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3874997T2 (de) * 1987-07-20 1993-03-25 Nippon Electric Co Echokompensator.
JP2810052B2 (ja) * 1987-11-18 1998-10-15 株式会社日立製作所 伝送装置
JPH0748681B2 (ja) * 1989-02-23 1995-05-24 日本電気株式会社 エコー消去器の係数制御方法
JP2520770B2 (ja) * 1990-07-06 1996-07-31 富士通株式会社 ハイブリッド回路
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
JP2836277B2 (ja) * 1991-03-14 1998-12-14 国際電信電話株式会社 エコーキャンセル装置
JP3065133B2 (ja) * 1991-08-21 2000-07-12 富士通株式会社 ジッタ補償装置
US5353279A (en) * 1991-08-29 1994-10-04 Nec Corporation Echo canceler
SE501248C2 (sv) * 1993-05-14 1994-12-19 Ericsson Telefon Ab L M Metod och ekosläckare för ekoutsläckning med ett antal kaskadkopplade adaptiva filter
JP3336126B2 (ja) * 1994-09-05 2002-10-21 富士通株式会社 エコーキャンセラの波形歪み補償装置
US5631899A (en) * 1995-05-31 1997-05-20 Lucent Technologies Inc. Acoustic echo canceler
US6678254B1 (en) 1999-05-03 2004-01-13 Nortel Networks Limited Method and communication device for optimizing echo cancellation
DE19960051A1 (de) * 1999-12-14 2001-06-21 Alcatel Sa Verfahren zur Echounterdrückung in einem Telekommunikationssystem und Echounterdrückungseinrichtung zur Durchführung des Verfahrens

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3327467A1 (de) * 1983-07-29 1985-02-14 Siemens AG, 1000 Berlin und 8000 München Verfahren und schaltungsanordnung zur kompensation von echosignalen
NZ214905A (en) * 1985-01-29 1988-09-29 British Telecomm Noise cancellation by adaptive filter compensates for timing variations
DE3874997T2 (de) * 1987-07-20 1993-03-25 Nippon Electric Co Echokompensator.

Also Published As

Publication number Publication date
AU2465988A (en) 1989-05-11
US4965823A (en) 1990-10-23
JPH0752859B2 (ja) 1995-06-05
EP0315191A1 (de) 1989-05-10
CA1329833C (en) 1994-05-24
DE3887821T2 (de) 1994-05-19
JPH01123534A (ja) 1989-05-16
EP0315191B1 (de) 1994-02-16
AU613418B2 (en) 1991-08-01

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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