BE878423A - Procede et dispositif d'annulation d'echo numerique - Google Patents

Procede et dispositif d'annulation d'echo numerique

Info

Publication number
BE878423A
BE878423A BE0/196878A BE196878A BE878423A BE 878423 A BE878423 A BE 878423A BE 0/196878 A BE0/196878 A BE 0/196878A BE 196878 A BE196878 A BE 196878A BE 878423 A BE878423 A BE 878423A
Authority
BE
Belgium
Prior art keywords
echo cancellation
cancellation method
digital echo
digital
echo
Prior art date
Application number
BE0/196878A
Other languages
English (en)
Inventor
R Billi
M Copperi
Original Assignee
Cselt Centro Studi Lab Telecom
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 Cselt Centro Studi Lab Telecom filed Critical Cselt Centro Studi Lab Telecom
Publication of BE878423A publication Critical patent/BE878423A/fr

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
    • H04B3/232—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 phase shift, phase roll or frequency offset correction

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
BE0/196878A 1978-08-29 1979-08-24 Procede et dispositif d'annulation d'echo numerique BE878423A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT68993/78A IT1115559B (it) 1978-08-29 1978-08-29 Procedimento e dispositivo per la cancellazione numerica dell eco

Publications (1)

Publication Number Publication Date
BE878423A true BE878423A (fr) 1979-12-17

Family

ID=11311109

Family Applications (1)

Application Number Title Priority Date Filing Date
BE0/196878A BE878423A (fr) 1978-08-29 1979-08-24 Procede et dispositif d'annulation d'echo numerique

Country Status (16)

Country Link
US (1) US4558187A (fr)
JP (1) JPS5531394A (fr)
AR (1) AR220949A1 (fr)
AU (1) AU525350B2 (fr)
BE (1) BE878423A (fr)
BR (1) BR7905279A (fr)
CA (1) CA1118924A (fr)
ES (1) ES483118A1 (fr)
FR (1) FR2435172A1 (fr)
GB (1) GB2029175B (fr)
IN (1) IN151237B (fr)
IT (1) IT1115559B (fr)
MX (1) MX152097A (fr)
NL (1) NL7906425A (fr)
SE (1) SE438066B (fr)
ZA (1) ZA794040B (fr)

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1115559B (it) * 1978-08-29 1986-02-03 Cselt Centro Studi Lab Telecom Procedimento e dispositivo per la cancellazione numerica dell eco
US4381561A (en) * 1980-10-23 1983-04-26 International Telephone And Telegraph Corporation All digital LSI line circuit for analog lines
US4351060A (en) * 1980-10-23 1982-09-21 International Telephone And Telegraph Corporation Automatic, digitally synthesized matching line terminating impedance
EP0270706B1 (fr) * 1982-06-14 1993-03-24 Telecommunications Radioelectriques Et Telephoniques T.R.T. Procédé destiné à réduire le temps de convergence d'un annuleur d'écho
FR2528643A1 (fr) * 1982-06-14 1983-12-16 Trt Telecom Radio Electr Procede destine a reduire le temps de convergence d'un annuleur d'echo et dispositif utilise pour mettre en oeuvre ce procede
FR2546693B1 (fr) * 1983-05-26 1985-08-30 Centre Nat Rech Scient Annuleur d'echo a filtre numerique adaptatif pour systeme de transmission
DE3376943D1 (en) * 1983-06-30 1988-07-07 Ibm Starting-up method for an echo canceller filter, and communication system using this method
IT1208769B (it) * 1983-10-12 1989-07-10 Cselt Centro Studi Lab Telecom Teristiche varianti nel tempo procedimento e dispositivo per la cancellazione numerica dell eco generato in collegamenti con carat
GB2182826B (en) * 1985-11-20 1990-08-01 Stc Plc Data transmission system
FR2597690B1 (fr) * 1986-04-22 1988-06-10 Trt Telecom Radio Electr Appareil de detection et de discrimination de sauts de phase dans un signal periodique et application a un signal telephonique de tonalite avec inversions de phase.
GB2205468A (en) * 1987-06-01 1988-12-07 Atlantic Network Systems Plc Modems and echo cancellers
US4813073A (en) * 1987-07-02 1989-03-14 Codex Corporation Echo cancellation
US5001747A (en) * 1990-01-22 1991-03-19 Racal Data Communications Inc. Frequency offset estimator for data modem
US5164989A (en) * 1990-12-11 1992-11-17 Octel Communications Corporation Echo cancellation methods and apparatus for voice processing systems
US5471527A (en) 1993-12-02 1995-11-28 Dsc Communications Corporation Voice enhancement system and method
US5487109A (en) * 1994-05-17 1996-01-23 Bellsouth Corporation End office of a telephone system with a zero loss plan
KR100200635B1 (ko) * 1996-10-28 1999-06-15 윤종용 화상회의 시스템에서의 반향제어 장치 및 제어방법
US6480532B1 (en) * 1999-07-13 2002-11-12 Stmicroelectronics, Inc. Echo cancellation for an ADSL modem
US6665402B1 (en) * 1999-08-31 2003-12-16 Nortel Networks Limited Method and apparatus for performing echo cancellation
US6728368B1 (en) * 2000-11-06 2004-04-27 Centillium Communications, Inc. Apparatus and method for a highly efficient low power driver for a central office ADSL system
US7095720B1 (en) 2001-10-17 2006-08-22 Sprint Communications Company L.P. Trunk level echo canceller test system
EP1691490B1 (fr) * 2005-02-11 2008-08-13 Mitel Networks Corporation Procédé pour la mesure de la distorsion et pour la détermination d'une seuil pour l'echo résiduel dans les circuits téléphoniques
JP4312227B2 (ja) * 2006-11-21 2009-08-12 富士通株式会社 エコー処理方法及び装置
CN110473562B (zh) * 2018-05-10 2022-03-08 杭州海康威视数字技术股份有限公司 音频数据处理方法、装置以及系统

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3810182A (en) * 1971-08-12 1974-05-07 North American Rockwell Adaptive electronic hybrid transformer
US4072830A (en) * 1976-10-04 1978-02-07 Bell Telephone Laboratories, Incorporated Variable phase shifter for adaptive echo cancellers
SE426763B (sv) * 1977-01-17 1983-02-07 Trt Telecom Radio Electr Digital ekoeliminator for ett modem for dataoverforing genom modulation av en bervag
IT1115559B (it) * 1978-08-29 1986-02-03 Cselt Centro Studi Lab Telecom Procedimento e dispositivo per la cancellazione numerica dell eco

Also Published As

Publication number Publication date
AU525350B2 (en) 1982-11-04
IT7868993A0 (it) 1978-08-29
GB2029175A (en) 1980-03-12
AU4948879A (en) 1980-03-06
SE438066B (sv) 1985-03-25
ES483118A1 (es) 1980-05-16
JPS5531394A (en) 1980-03-05
FR2435172B1 (fr) 1983-11-18
AR220949A1 (es) 1980-12-15
FR2435172A1 (fr) 1980-03-28
MX152097A (es) 1985-05-29
BR7905279A (pt) 1980-05-06
IT1115559B (it) 1986-02-03
NL7906425A (nl) 1980-03-04
GB2029175B (en) 1982-09-08
IN151237B (fr) 1983-03-12
SE7906857L (sv) 1980-03-01
ZA794040B (en) 1980-08-27
US4558187A (en) 1985-12-10
CA1118924A (fr) 1982-02-23

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Legal Events

Date Code Title Description
RE Patent lapsed

Owner name: CSELT CENTRO STUDI E LABORATORI TELECOMMUNICAZION

Effective date: 19850831