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IT1115559B - Procedimento e dispositivo per la cancellazione numerica dell eco - Google Patents

Procedimento e dispositivo per la cancellazione numerica dell eco

Info

Publication number
IT1115559B
IT1115559B IT68993/78A IT6899378A IT1115559B IT 1115559 B IT1115559 B IT 1115559B IT 68993/78 A IT68993/78 A IT 68993/78A IT 6899378 A IT6899378 A IT 6899378A IT 1115559 B IT1115559 B IT 1115559B
Authority
IT
Italy
Prior art keywords
echo
cancellation
numerical
procedure
numerical cancellation
Prior art date
Application number
IT68993/78A
Other languages
English (en)
Other versions
IT7868993A0 (it
Inventor
Roberto Billi
Maurizio 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 IT7868993A0 publication Critical patent/IT7868993A0/it
Priority to IT68993/78A priority Critical patent/IT1115559B/it
Priority to IN594/CAL/79A priority patent/IN151237B/en
Priority to AU49488/79A priority patent/AU525350B2/en
Priority to ES483118A priority patent/ES483118A1/es
Priority to AR277586A priority patent/AR220949A1/es
Priority to ZA00794040A priority patent/ZA794040B/xx
Priority to JP9994079A priority patent/JPS5531394A/ja
Priority to MX178808A priority patent/MX152097A/es
Priority to FR7920270A priority patent/FR2435172A1/fr
Priority to GB7927682A priority patent/GB2029175B/en
Priority to SE7906857A priority patent/SE438066B/sv
Priority to BR7905279A priority patent/BR7905279A/pt
Priority to BE0/196878A priority patent/BE878423A/xx
Priority to CA000334648A priority patent/CA1118924A/en
Priority to NL7906425A priority patent/NL7906425A/nl
Priority to US06/319,086 priority patent/US4558187A/en
Application granted granted Critical
Publication of IT1115559B publication Critical patent/IT1115559B/it

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)
IT68993/78A 1978-08-29 1978-08-29 Procedimento e dispositivo per la cancellazione numerica dell eco IT1115559B (it)

Priority Applications (16)

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
IN594/CAL/79A IN151237B (it) 1978-08-29 1979-06-08
AU49488/79A AU525350B2 (en) 1978-08-29 1979-08-02 Digital echo cancellation
ES483118A ES483118A1 (es) 1978-08-29 1979-08-03 Procedimiento y dispositivo para la anulacion numerica del eco en transmisiones por lineas telefonicas de cuatro hilos
AR277586A AR220949A1 (es) 1978-08-29 1979-08-03 Anulador numerico de eco en transmisiones por lineas telefonicas
ZA00794040A ZA794040B (en) 1978-08-29 1979-08-06 Method and device for digital echo cancellation
JP9994079A JPS5531394A (en) 1978-08-29 1979-08-07 Method of and device for removing digital echo
MX178808A MX152097A (es) 1978-08-29 1979-08-07 Mejoras en anulador numerico de eco
FR7920270A FR2435172A1 (fr) 1978-08-29 1979-08-08 Procede et dispositif permettant d'annuler les echos dans les lignes telephoniques
GB7927682A GB2029175B (en) 1978-08-29 1979-08-08 Transmission line digital echo cancellation
SE7906857A SE438066B (sv) 1978-08-29 1979-08-16 Forfarande for att erhalla en digital ekoestimeringssignal, avsedd att anvendas i ett ekoelimineringssystem samt en anordning for utforande av forfarandet
BR7905279A BR7905279A (pt) 1978-08-29 1979-08-16 Processo de cancelamento digital de eco e respectivo cancelador digital de eco
BE0/196878A BE878423A (fr) 1978-08-29 1979-08-24 Procede et dispositif d'annulation d'echo numerique
CA000334648A CA1118924A (en) 1978-08-29 1979-08-24 Method and device for digital echo cancellation
NL7906425A NL7906425A (nl) 1978-08-29 1979-08-27 Werkwijze en toestel voor digitale echo-opheffing.
US06/319,086 US4558187A (en) 1978-08-29 1981-11-06 Digital echo-cancellation method and circuit arrangement

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 (2)

Publication Number Publication Date
IT7868993A0 IT7868993A0 (it) 1978-08-29
IT1115559B true IT1115559B (it) 1986-02-03

Family

ID=11311109

Family Applications (1)

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

Country Status (16)

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

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
US4351060A (en) * 1980-10-23 1982-09-21 International Telephone And Telegraph Corporation Automatic, digitally synthesized matching line terminating impedance
US4381561A (en) * 1980-10-23 1983-04-26 International Telephone And Telegraph Corporation All digital LSI line circuit for analog lines
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
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
FR2546693B1 (fr) * 1983-05-26 1985-08-30 Centre Nat Rech Scient Annuleur d'echo a filtre numerique adaptatif pour systeme de transmission
EP0130263B1 (fr) * 1983-06-30 1988-06-01 International Business Machines Corporation Procédé d'initialisation d'un filtre annuleur d'écho et système de communication utilisant ledit procédé
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 (en) * 2005-02-11 2008-08-13 Mitel Networks Corporation Method of measuring distortion and determining residue-echo threshold in loop trunk circuits
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
NL7800408A (nl) * 1977-01-17 1978-07-19 Trt Telecom Radio Electr Digitale echocompensator voor een modem voor datatransmissie met behulp van modulatie van een draaggolf.
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
FR2435172A1 (fr) 1980-03-28
BE878423A (fr) 1979-12-17
MX152097A (es) 1985-05-29
AU4948879A (en) 1980-03-06
IN151237B (it) 1983-03-12
ES483118A1 (es) 1980-05-16
BR7905279A (pt) 1980-05-06
JPS5531394A (en) 1980-03-05
AR220949A1 (es) 1980-12-15
SE7906857L (sv) 1980-03-01
NL7906425A (nl) 1980-03-04
IT7868993A0 (it) 1978-08-29
GB2029175A (en) 1980-03-12
GB2029175B (en) 1982-09-08
CA1118924A (en) 1982-02-23
ZA794040B (en) 1980-08-27
FR2435172B1 (it) 1983-11-18
US4558187A (en) 1985-12-10
SE438066B (sv) 1985-03-25

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