DE3275799D1 - Echo cancelling system - Google Patents

Echo cancelling system

Info

Publication number
DE3275799D1
DE3275799D1 DE8282402244T DE3275799T DE3275799D1 DE 3275799 D1 DE3275799 D1 DE 3275799D1 DE 8282402244 T DE8282402244 T DE 8282402244T DE 3275799 T DE3275799 T DE 3275799T DE 3275799 D1 DE3275799 D1 DE 3275799D1
Authority
DE
Germany
Prior art keywords
echo cancelling
cancelling system
echo
cancelling
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
Application number
DE8282402244T
Other languages
English (en)
Inventor
De Verdiere Jean-Marc Ma Colin
Patrice Rene Langlois
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.)
Societe Anonyme de Telecommunications SAT
Original Assignee
Societe Anonyme de Telecommunications SAT
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 Societe Anonyme de Telecommunications SAT filed Critical Societe Anonyme de Telecommunications SAT
Application granted granted Critical
Publication of DE3275799D1 publication Critical patent/DE3275799D1/de
Expired 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
    • H04B3/238—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)
  • Telephonic Communication Services (AREA)
  • Hardware Redundancy (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
  • Bidirectional Digital Transmission (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
DE8282402244T 1981-12-09 1982-12-08 Echo cancelling system Expired DE3275799D1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8122984A FR2517905B1 (fr) 1981-12-09 1981-12-09 Dispositif d'initialisation pour annuleur d'echo et son application aux echos lointains

Publications (1)

Publication Number Publication Date
DE3275799D1 true DE3275799D1 (en) 1987-04-23

Family

ID=9264821

Family Applications (1)

Application Number Title Priority Date Filing Date
DE8282402244T Expired DE3275799D1 (en) 1981-12-09 1982-12-08 Echo cancelling system

Country Status (12)

Country Link
US (1) US4578544A (de)
EP (1) EP0081437B1 (de)
JP (1) JPS58114534A (de)
CA (1) CA1208733A (de)
DE (1) DE3275799D1 (de)
DK (1) DK545682A (de)
ES (1) ES517955A0 (de)
FI (1) FI74845C (de)
FR (1) FR2517905B1 (de)
HU (1) HU186186B (de)
NO (1) NO156628C (de)
SU (1) SU1308208A3 (de)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4669116A (en) * 1982-12-09 1987-05-26 Regents Of The University Of California Non-linear echo cancellation of data signals
US4715064A (en) * 1984-06-22 1987-12-22 Ncr Corporation Adaptive hybrid circuit
GB8427165D0 (en) * 1984-10-26 1984-12-05 British Telecomm Adaptive recognising device
NZ214905A (en) * 1985-01-29 1988-09-29 British Telecomm Noise cancellation by adaptive filter compensates for timing variations
US4811342A (en) * 1985-11-12 1989-03-07 Racal Data Communications Inc. High speed analog echo canceller
EP0333718B1 (de) * 1986-10-01 1992-06-03 Racal-Datacom Inc. Echokompensator mit adaptiven, dynamisch geschalteten abgriffen
US4805215A (en) * 1986-10-01 1989-02-14 Racal Data Communications Inc. Adaptive echo canceller with sparse dynamically positioned taps
EP0272714B1 (de) * 1986-11-17 1992-06-24 Alcatel N.V. Einstellbarer Echokompensator
US4813073A (en) * 1987-07-02 1989-03-14 Codex Corporation Echo cancellation
FR2618925B1 (fr) * 1987-07-30 1989-12-15 Rault Jean Dispositif de calcul numerique pour installation de transmission de donnees en code 2b 1q ou analogue
US5065242A (en) * 1990-06-29 1991-11-12 General Electric Company Deghosting apparatus using pseudorandom sequences
JPH0527019U (ja) * 1991-09-19 1993-04-06 俊子 阿曽 保冷帽子
FR2682252B1 (fr) * 1991-10-04 1995-11-03 Prescom Sarl Procede de traitement de signal et dispositif de prise et de restitution de son mettant en óoeuvre ce procede.
FR2713417B1 (fr) * 1993-12-02 1996-02-02 Europ Agence Spatiale Procédé de réglage adaptatif d'un suppresseur d'écho.
US5920548A (en) * 1996-10-01 1999-07-06 Telefonaktiebolaget L M Ericsson Echo path delay estimation
CA2415363C (en) * 2000-07-11 2006-01-24 Samsung Electronics Co., Ltd. Repetitive-pn1023-sequence echo-cancellation reference signal for single-carrier digital television broadcast systems
US7881460B2 (en) * 2005-11-17 2011-02-01 Microsoft Corporation Configuration of echo cancellation
US20070112563A1 (en) * 2005-11-17 2007-05-17 Microsoft Corporation Determination of audio device quality

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2795865A (en) * 1954-03-29 1957-06-18 Backiel Mary Protective foot covering
US3735055A (en) * 1971-11-05 1973-05-22 Bell Telephone Labor Inc Method for improving the settling time of a transversal filter adaptive echo canceller
US3795865A (en) * 1972-02-23 1974-03-05 Honeywell Inf Systems Automated real time equalized modem
FR2337465A1 (fr) * 1975-12-30 1977-07-29 Ibm France Procede et dispositif pour determiner les valeurs initiales des coefficients d'un egaliseur transversal complexe
AU514263B2 (en) * 1977-01-17 1981-01-29 T.R.T. Digital echo canceller
FR2460075B1 (fr) * 1979-06-22 1988-12-09 Cit Alcatel Annuleur d'echo adaptatif pour transmission de donnees en duplex
NL7905577A (nl) * 1979-07-18 1981-01-20 Philips Nv Inrichting met een niet-recursieffilter.
CA1173128A (en) * 1981-10-13 1984-08-21 Pok F. Lee Echo cancellation using transversal filters

Also Published As

Publication number Publication date
FI824217L (fi) 1983-06-10
DK545682A (da) 1983-06-10
US4578544A (en) 1986-03-25
NO156628C (no) 1987-10-21
FR2517905A1 (fr) 1983-06-10
NO156628B (no) 1987-07-13
SU1308208A3 (ru) 1987-04-30
JPS58114534A (ja) 1983-07-07
FI74845B (fi) 1987-11-30
FR2517905B1 (fr) 1985-11-29
HU186186B (en) 1985-06-28
FI74845C (fi) 1988-03-10
CA1208733A (en) 1986-07-29
FI824217A0 (fi) 1982-12-08
EP0081437A1 (de) 1983-06-15
ES8308663A1 (es) 1983-09-16
NO824130L (no) 1983-06-10
ES517955A0 (es) 1983-09-16
EP0081437B1 (de) 1987-03-18

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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