BR8405550A - Dispositivo de correcao de ecos em transmissao numerica - Google Patents

Dispositivo de correcao de ecos em transmissao numerica

Info

Publication number
BR8405550A
BR8405550A BR8405550A BR8405550A BR8405550A BR 8405550 A BR8405550 A BR 8405550A BR 8405550 A BR8405550 A BR 8405550A BR 8405550 A BR8405550 A BR 8405550A BR 8405550 A BR8405550 A BR 8405550A
Authority
BR
Brazil
Prior art keywords
transversal filter
coefficients
analog
digital
carried out
Prior art date
Application number
BR8405550A
Other languages
English (en)
Inventor
Paul Jacques Palicot
Pierre Guy Dublet
Original Assignee
Estabelecimento Publico De Dif
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 Estabelecimento Publico De Dif filed Critical Estabelecimento Publico De Dif
Publication of BR8405550A publication Critical patent/BR8405550A/pt

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

  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Engineering & Computer Science (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)
BR8405550A 1983-10-28 1984-10-26 Dispositivo de correcao de ecos em transmissao numerica BR8405550A (pt)

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 (1)

Publication Number Publication Date
BR8405550A true BR8405550A (pt) 1985-09-10

Family

ID=9293722

Family Applications (1)

Application Number Title Priority Date Filing Date
BR8405550A BR8405550A (pt) 1983-10-28 1984-10-26 Dispositivo de correcao de ecos em transmissao numerica

Country Status (12)

Country Link
US (1) US4696015A (pt)
EP (1) EP0140809B1 (pt)
JP (1) JPS60111537A (pt)
AT (1) ATE34495T1 (pt)
AU (1) AU566962B2 (pt)
BR (1) BR8405550A (pt)
CA (1) CA1217856A (pt)
DE (1) DE3471414D1 (pt)
ES (1) ES537153A0 (pt)
FR (1) FR2556530B1 (pt)
MX (1) MX155974A (pt)
PT (1) PT79396B (pt)

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
DE3768975D1 (de) * 1986-01-30 1991-05-08 Siemens Ag Echokompensator.
US5058047A (en) * 1989-05-30 1991-10-15 Advanced Micro Devices, Inc. System and method for providing digital filter coefficients
FR2650137B1 (pt) * 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
US7831035B2 (en) * 2006-04-28 2010-11-09 Microsoft Corporation Integration of a microphone array with acoustic echo cancellation and center clipping
US7773743B2 (en) * 2006-04-28 2010-08-10 Microsoft Corporation Integration of a microphone array with acoustic echo cancellation and residual echo suppression
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
ATE34495T1 (de) 1988-06-15
FR2556530A1 (fr) 1985-06-14
EP0140809A1 (fr) 1985-05-08
MX155974A (es) 1988-06-03
CA1217856A (en) 1987-02-10
ES8507300A1 (es) 1985-08-16
AU566962B2 (en) 1987-11-05
EP0140809B1 (fr) 1988-05-18
FR2556530B1 (fr) 1986-04-04
PT79396B (fr) 1986-07-22
ES537153A0 (es) 1985-08-16
DE3471414D1 (en) 1988-06-23
AU3475684A (en) 1985-05-09
PT79396A (fr) 1984-11-01
US4696015A (en) 1987-09-22
JPS60111537A (ja) 1985-06-18

Similar Documents

Publication Publication Date Title
BR8405550A (pt) Dispositivo de correcao de ecos em transmissao numerica
GB8723073D0 (en) Reducing effects of electrical noise
DE69128519T2 (de) Aktives Dämpfungssystem mit einer vorgegebenen akustischen Ausgangswelle
JPS5571316A (en) Recursive digital filter
MY103933A (en) Ghost canceling filter circuit
GB1461477A (en) Recursive digital filter
KR960008497B1 (en) Digital circuit for sampling rate variation and signal filtering
DE3262334D1 (en) Regenerator for digital signals with quantized feedback
DK149360C (da) Adaptivt, transversalt kompenseringselement
US5111418A (en) Method and network configuration for obtaining the gradient of the output signals of a given network for processing discrete-time signals relating to the network parameters
DE3782882D1 (de) Filteranordnung.
JPS5763985A (en) Processing circuit of chroma signal
DE69130863T2 (de) Fernechokompensator
JPS57143675A (en) Correlator
JPS6462011A (en) Correlation noise suppression circuit
JPS57143965A (en) Multifrequency signal receiver
JPS56140461A (en) Picture processing method
DE3783786D1 (de) Schaltung zur digitalen kompensation eines determinierten stoersignals.
JPS62230121A (ja) 信号処理装置
GERANIN et al. Rounding noise in M-stage recursive digital filter(Abstract Only)
DE3485263D1 (de) Adaptiver entzerrer.
JPS5571315A (en) Limit cycle reduction system of digital filter
JPS55139601A (en) Delay modulating circuit
JPS63100828A (ja) エコ−キヤンセラ
JPS5516573A (en) Cyclic variable filter