ES8507300A1 - Dispositivo de correccion de ecos en transmision numerica - Google Patents

Dispositivo de correccion de ecos en transmision numerica

Info

Publication number
ES8507300A1
ES8507300A1 ES537153A ES537153A ES8507300A1 ES 8507300 A1 ES8507300 A1 ES 8507300A1 ES 537153 A ES537153 A ES 537153A ES 537153 A ES537153 A ES 537153A ES 8507300 A1 ES8507300 A1 ES 8507300A1
Authority
ES
Spain
Prior art keywords
transversal filter
coefficients
analog
digital
carried out
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
ES537153A
Other languages
English (en)
Other versions
ES537153A0 (es
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.)
Telediffusion de France ets Public de Diffusion
Original Assignee
Telediffusion de France ets Public de Diffusion
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 Telediffusion de France ets Public de Diffusion filed Critical Telediffusion de France ets Public de Diffusion
Publication of ES537153A0 publication Critical patent/ES537153A0/es
Publication of ES8507300A1 publication Critical patent/ES8507300A1/es
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
    • 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)
  • Filters That Use Time-Delay Elements (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Details Of Television Systems (AREA)
  • Primary Cells (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Numerical Control (AREA)
  • Structure Of Transmissions (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)

Abstract

PERFECCIONAMIENTOS EN UN DISPOSITIVO DE CORRECCION DE ECOS EN TRANSMISION NUMERICA.CONSISTENTES EN: CONECTAR LA ENTRADA (E) DEL CIRCUITO DE CALCULO (7) A LA ENTRADA DEL FILTRO TRANSVERSAL ANALOGICO (6), DOTAR AL CIRCUITO DE CALCULO (7) DE UN CONVERTIDOR ANALOGICO/NUMERICO (12) CUYA SALIDA VA CONECTADA A UN FILTRO TRANSVERSAL NUMERICO AUTOADAPTATIVO, Y CONSTITUIR AL FILTRO TRANSVERSAL NUMERICO AUTOADAPTIVO, POR UN CIRCUITO DE CALCULO DE MEDIA (10) POR UNA MEMORIA DE MUESTRAS (13) SUMINISTRADAS POR EL CONVERTIDOR ANALOGICO/NUMERICO (12), Y POR UN MICROPROCESADOR (14) QUE EFECTUA SOBRE LAS MUESTRAS DE LA MEMORIA LAS MULTIPLICACIONES POR LOS COEFICIENTES QUE CALCULA Y LA SUMA DE LAS MUESTRAS MULTIPLICADAS EN FUNCION DEL CRITERIO DE OPTIMIZACION Y EL ALGORITMO DE CONVERGENCIA.
ES537153A 1983-10-28 1984-10-26 Dispositivo de correccion de ecos en transmision numerica Expired ES8507300A1 (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8317438A FR2556530B1 (fr) 1983-10-28 1983-10-28 Dispositif de correction d'echos, notamment pour systeme de diffusion de donnees

Publications (2)

Publication Number Publication Date
ES537153A0 ES537153A0 (es) 1985-08-16
ES8507300A1 true ES8507300A1 (es) 1985-08-16

Family

ID=9293722

Family Applications (1)

Application Number Title Priority Date Filing Date
ES537153A Expired ES8507300A1 (es) 1983-10-28 1984-10-26 Dispositivo de correccion de ecos en transmision numerica

Country Status (12)

Country Link
US (1) US4696015A (es)
EP (1) EP0140809B1 (es)
JP (1) JPS60111537A (es)
AT (1) ATE34495T1 (es)
AU (1) AU566962B2 (es)
BR (1) BR8405550A (es)
CA (1) CA1217856A (es)
DE (1) DE3471414D1 (es)
ES (1) ES8507300A1 (es)
FR (1) FR2556530B1 (es)
MX (1) MX155974A (es)
PT (1) PT79396B (es)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4811261A (en) * 1985-03-04 1989-03-07 Oki Electric Industry Co., Ltd. Adaptive digital filter for determining a transfer equation of an unknown system
ES2021285B3 (es) * 1986-01-30 1991-11-01 Siemens Ag Compensador de eco
US5058047A (en) * 1989-05-30 1991-10-15 Advanced Micro Devices, Inc. System and method for providing digital filter coefficients
FR2650137B1 (es) * 1989-07-18 1994-10-28 France Etat
US5535150A (en) * 1993-04-20 1996-07-09 Massachusetts Institute Of Technology Single chip adaptive filter utilizing updatable weighting techniques
US6542611B1 (en) * 1998-07-31 2003-04-01 Circuit Research Labs, Inc. Multi-state echo suppressor
DE19925046A1 (de) * 1999-06-01 2001-05-03 Alcatel Sa Verfahren und Vorrichtung zur Unterdrückung von Rauschen und Echos
US6480532B1 (en) * 1999-07-13 2002-11-12 Stmicroelectronics, Inc. Echo cancellation for an ADSL modem
FR2801753B1 (fr) * 1999-11-25 2002-05-03 Groupe Ecoles Telecomm Perfectionnements aux dispositifs d'egalisation adaptative pour recuperateurs de systemes de communication numeriques
US8295475B2 (en) * 2006-01-13 2012-10-23 Microsoft Corporation Selective glitch detection, clock drift compensation, and anti-clipping in audio echo cancellation
US7773743B2 (en) * 2006-04-28 2010-08-10 Microsoft Corporation Integration of a microphone array with acoustic echo cancellation and residual echo suppression
US7831035B2 (en) * 2006-04-28 2010-11-09 Microsoft Corporation Integration of a microphone array with acoustic echo cancellation and center clipping
US8380253B2 (en) 2008-02-15 2013-02-19 Microsoft Corporation Voice switching for voice communication on computers
US8369251B2 (en) * 2008-06-20 2013-02-05 Microsoft Corporation Timestamp quality assessment for assuring acoustic echo canceller operability

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3787645A (en) * 1971-05-19 1974-01-22 Nippon Electric Co Echo canceller having two echo path models
NL171215C (nl) * 1973-03-09 1983-02-16 Trt Telecom Radio Electr Automatische egalisatie-inrichting voor een datatransmissiekanaal.
FR2370396A1 (fr) * 1976-11-09 1978-06-02 Cit Alcatel Ensemble d'egalisation autoadaptatif
FR2410917A1 (fr) * 1977-11-30 1979-06-29 Cit Alcatel Egaliseur autoadaptatif
US4321686A (en) * 1980-01-24 1982-03-23 Communications Satellite Corporation Correction processor of self-adaptive filters
FR2479617A1 (fr) * 1980-03-26 1981-10-02 Trt Telecom Radio Electr Annuleur d'echo pour signal d'echo a phase variable
JPS56169919A (en) * 1980-06-03 1981-12-26 Toshiba Corp Automatic equalizer
US4430743A (en) * 1980-11-17 1984-02-07 Nippon Electric Co., Ltd. Fast start-up system for transversal equalizers
FR2541837A1 (fr) * 1983-02-25 1984-08-31 Trt Telecom Radio Electr Procede de reduction du temps de convergence d'un annuleur d'echo et dispositif pour mettre en oeuvre ce procede

Also Published As

Publication number Publication date
MX155974A (es) 1988-06-03
PT79396A (fr) 1984-11-01
AU3475684A (en) 1985-05-09
CA1217856A (en) 1987-02-10
PT79396B (fr) 1986-07-22
US4696015A (en) 1987-09-22
FR2556530B1 (fr) 1986-04-04
BR8405550A (pt) 1985-09-10
DE3471414D1 (en) 1988-06-23
ATE34495T1 (de) 1988-06-15
AU566962B2 (en) 1987-11-05
EP0140809B1 (fr) 1988-05-18
ES537153A0 (es) 1985-08-16
JPS60111537A (ja) 1985-06-18
FR2556530A1 (fr) 1985-06-14
EP0140809A1 (fr) 1985-05-08

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Legal Events

Date Code Title Description
FD1A Patent lapsed

Effective date: 19970303