FR2377734A1 - DIGITAL ECHO CANCELER FOR MODEM FOR DATA TRANSMISSION BY MODULATION OF A CARRIER - Google Patents

DIGITAL ECHO CANCELER FOR MODEM FOR DATA TRANSMISSION BY MODULATION OF A CARRIER

Info

Publication number
FR2377734A1
FR2377734A1 FR7701197A FR7701197A FR2377734A1 FR 2377734 A1 FR2377734 A1 FR 2377734A1 FR 7701197 A FR7701197 A FR 7701197A FR 7701197 A FR7701197 A FR 7701197A FR 2377734 A1 FR2377734 A1 FR 2377734A1
Authority
FR
France
Prior art keywords
carrier
data transmission
echo
modulation
signal
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.)
Granted
Application number
FR7701197A
Other languages
French (fr)
Other versions
FR2377734B1 (en
Inventor
Jean-Pierre Baudoux
Cesar Denis Macchi
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.)
Telecommunications Radioelectriques et Telephoniques SA TRT
Original Assignee
Telecommunications Radioelectriques et Telephoniques SA TRT
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
Priority to FR7701197A priority Critical patent/FR2377734A1/en
Application filed by Telecommunications Radioelectriques et Telephoniques SA TRT filed Critical Telecommunications Radioelectriques et Telephoniques SA TRT
Priority to IT19251/78A priority patent/IT1091970B/en
Priority to NL7800408A priority patent/NL7800408A/en
Priority to GB142978A priority patent/GB1580821A/en
Priority to AU32430/78A priority patent/AU514263B2/en
Priority to SE7800390A priority patent/SE426763B/en
Priority to DE2801375A priority patent/DE2801375C3/en
Priority to BE184361A priority patent/BE862951A/en
Priority to US05/869,508 priority patent/US4162378A/en
Priority to JP285878A priority patent/JPS5390712A/en
Publication of FR2377734A1 publication Critical patent/FR2377734A1/en
Application granted granted Critical
Publication of FR2377734B1 publication Critical patent/FR2377734B1/fr
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
    • H04L5/1423—Two-way operation using the same type of signal, i.e. duplex for simultaneous baseband signals
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Bidirectional Digital Transmission (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

Annuleur d'écho numérique pour modem de transmission de données par modulation d'une porteuse à la fréquence 1/T au moyen de symboles se produisant à des instants iT. Cet annuleur d'écho comporte des moyens répondant à chaque configuration de symbole à chaque instant iT pour élaborer au moins un nombre dépendant de l'amplitude attribuée à la porteuse audit instant et pour diriger ce nombre vers au moins une partie déterminée d'un ensemble de filtres numériques adaptatifs dont les signaux de sortie sont combinés pour former la version numérique du signal de copie d'écho; les coefficients de ces filtres sont ajustés à partir du signal d'erreur entre le signal d'écho et le signal de copie d'écho, de façon à rendre minimale la valeur quadratique moyenne de ce signal d'erreur. Application : transmission de données en Duplex simultané.Digital echo canceller for data transmission modem by modulation of a carrier at frequency 1 / T by means of symbols occurring at times iT. This echo canceller comprises means responding to each symbol configuration at each instant iT to develop at least one number depending on the amplitude attributed to the carrier at said instant and to direct this number to at least a determined part of a set adaptive digital filters whose output signals are combined to form the digital version of the echo copy signal; the coefficients of these filters are adjusted from the error signal between the echo signal and the echo copy signal, so as to minimize the root mean square value of this error signal. Application: simultaneous duplex data transmission.

FR7701197A 1977-01-17 1977-01-17 DIGITAL ECHO CANCELER FOR MODEM FOR DATA TRANSMISSION BY MODULATION OF A CARRIER Granted FR2377734A1 (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
FR7701197A FR2377734A1 (en) 1977-01-17 1977-01-17 DIGITAL ECHO CANCELER FOR MODEM FOR DATA TRANSMISSION BY MODULATION OF A CARRIER
NL7800408A NL7800408A (en) 1977-01-17 1978-01-13 DIGITAL ECHOCOMPENSER FOR A MODEM FOR DATA TRANSMISSION USING CARRIER MODULATION.
GB142978A GB1580821A (en) 1977-01-17 1978-01-13 Digital echo canceller for a modem for data transmission by means of modulation of a carrier
AU32430/78A AU514263B2 (en) 1977-01-17 1978-01-13 Digital echo canceller
IT19251/78A IT1091970B (en) 1977-01-17 1978-01-13 DIGITAL DEVICE FOR THE CANCELLATION OF ECHOES, FOR A MODULATOR / DEMODULATOR, FOR THE TRANSMISSION OF DATA THROUGH MODULATION OF A CARRIER
SE7800390A SE426763B (en) 1977-01-17 1978-01-13 DIGITAL ECHO ELIMINATOR FOR A MODEM FOR DATA TRANSFER BY MODULATION OF A BERVAG
DE2801375A DE2801375C3 (en) 1977-01-17 1978-01-13 Digital echo canceller for a modem for data transmission with the aid of modulation of a carrier
BE184361A BE862951A (en) 1977-01-17 1978-01-16 DIGITALE ECHOCOMPENSATOR VOOR EEN MODEM VOOR DATATRANSMISSIE MET BEHULP VAN MODULATIE VAN EEN DRAAGGOLF
US05/869,508 US4162378A (en) 1977-01-17 1978-01-16 Digital echo canceler for a modem for data transmission by means of modulation of a carrier
JP285878A JPS5390712A (en) 1977-01-17 1978-01-17 Digital echo cancelling device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7701197A FR2377734A1 (en) 1977-01-17 1977-01-17 DIGITAL ECHO CANCELER FOR MODEM FOR DATA TRANSMISSION BY MODULATION OF A CARRIER

Publications (2)

Publication Number Publication Date
FR2377734A1 true FR2377734A1 (en) 1978-08-11
FR2377734B1 FR2377734B1 (en) 1980-11-21

Family

ID=9185558

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7701197A Granted FR2377734A1 (en) 1977-01-17 1977-01-17 DIGITAL ECHO CANCELER FOR MODEM FOR DATA TRANSMISSION BY MODULATION OF A CARRIER

Country Status (3)

Country Link
BE (1) BE862951A (en)
FR (1) FR2377734A1 (en)
GB (1) GB1580821A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2475322A1 (en) * 1980-02-01 1981-08-07 Trt Telecom Radio Electr ECHO CANCER WITH SIMPLIFIED CALCULATION CIRCUITS
EP0048515B1 (en) * 1980-09-19 1984-03-28 Telecommunications Radioelectriques Et Telephoniques T.R.T. Digital echo canceller comprising an analog to digital converter with adjustable volume range

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5471527A (en) 1993-12-02 1995-11-28 Dsc Communications Corporation Voice enhancement system and method
CN117172163B (en) * 2023-08-15 2024-04-12 重庆西南集成电路设计有限责任公司 Amplitude and phase two-dimensional optimization method and system of amplitude and phase control circuit, medium and electronic equipment

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2475322A1 (en) * 1980-02-01 1981-08-07 Trt Telecom Radio Electr ECHO CANCER WITH SIMPLIFIED CALCULATION CIRCUITS
EP0033568A1 (en) * 1980-02-01 1981-08-12 Telecommunications Radioelectriques Et Telephoniques T.R.T. Echo canceller with simplified computing circuits
EP0048515B1 (en) * 1980-09-19 1984-03-28 Telecommunications Radioelectriques Et Telephoniques T.R.T. Digital echo canceller comprising an analog to digital converter with adjustable volume range

Also Published As

Publication number Publication date
FR2377734B1 (en) 1980-11-21
GB1580821A (en) 1980-12-03
BE862951A (en) 1978-07-17

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Legal Events

Date Code Title Description
DR Decision of the appeal court due to an appeal at law against decisions of the director of the inpi, except decision of lapse
TP Transmission of property
TP Transmission of property