ES8308663A1 - Dispositivo de inicializacion para anulador de eco y sonido. - Google Patents

Dispositivo de inicializacion para anulador de eco y sonido.

Info

Publication number
ES8308663A1
ES8308663A1 ES517955A ES517955A ES8308663A1 ES 8308663 A1 ES8308663 A1 ES 8308663A1 ES 517955 A ES517955 A ES 517955A ES 517955 A ES517955 A ES 517955A ES 8308663 A1 ES8308663 A1 ES 8308663A1
Authority
ES
Spain
Prior art keywords
echo cancelling
sample
mod
varying
cancelling system
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
ES517955A
Other languages
English (en)
Other versions
ES517955A0 (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.)
Societe Anonyme de Telecommunications SAT
Original Assignee
Societe Anonyme de Telecommunications SAT
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 Societe Anonyme de Telecommunications SAT filed Critical Societe Anonyme de Telecommunications SAT
Publication of ES517955A0 publication Critical patent/ES517955A0/es
Publication of ES8308663A1 publication Critical patent/ES8308663A1/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
    • 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)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Telephonic Communication Services (AREA)
  • Hardware Redundancy (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
  • Bidirectional Digital Transmission (AREA)

Abstract

DISPOSITIVO DE INICIALIZACION PARA ANULADOR DE ECO Y SONIDO, PROVISTO DE MEDIOS PARA FORMAR N COEFICIENTES PARA LAS CONDICIONES INICIALES DE DICHO ANULADOR. CONSTA DE MEDIOS PARA TRANSFORMAR UNA SECUENCIA (U<K) PSEUDOALEATORIA DE LONGITUD N EN UNA SUCESION DE MUESTRAS (E<K), TAL QUE CADA MUESTRA E<K ES DEDUCIDA DE U<K POR E<K=2<U<K-1 MEDIOS PARA EMITIR DICHAS E<K EN LINEAS; DE MEDIOS PARA RECIBIR MUESTRAS S<N<+<K EN RECEPCION; DE MEDIOS PARA MULTIPLICAR CADA MUESTRA S<N<+<K RECIBIDA POR N MUESTRAS U<(<N<-<M<+<1<+<K<) <M<O<D <N EMITIDAS POR LA CELULA A (M) DE UN REGISTRO DE DESFASE; Y DE MEDIOS PARA FORMAR DOS SUCESIONES DE MUESTRAS A<K Y B<K A PARTIR DE LA SECUENCIA (U<K) PSEUDOALEATORIA.
ES517955A 1981-12-09 1982-12-06 Dispositivo de inicializacion para anulador de eco y sonido. Expired ES8308663A1 (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8122984A FR2517905B1 (fr) 1981-12-09 1981-12-09 Dispositif d'initialisation pour annuleur d'echo et son application aux echos lointains

Publications (2)

Publication Number Publication Date
ES517955A0 ES517955A0 (es) 1983-09-16
ES8308663A1 true ES8308663A1 (es) 1983-09-16

Family

ID=9264821

Family Applications (1)

Application Number Title Priority Date Filing Date
ES517955A Expired ES8308663A1 (es) 1981-12-09 1982-12-06 Dispositivo de inicializacion para anulador de eco y sonido.

Country Status (12)

Country Link
US (1) US4578544A (es)
EP (1) EP0081437B1 (es)
JP (1) JPS58114534A (es)
CA (1) CA1208733A (es)
DE (1) DE3275799D1 (es)
DK (1) DK545682A (es)
ES (1) ES8308663A1 (es)
FI (1) FI74845C (es)
FR (1) FR2517905B1 (es)
HU (1) HU186186B (es)
NO (1) NO156628C (es)
SU (1) SU1308208A3 (es)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4669116A (en) * 1982-12-09 1987-05-26 Regents Of The University Of California Non-linear echo cancellation of data signals
US4715064A (en) * 1984-06-22 1987-12-22 Ncr Corporation Adaptive hybrid circuit
GB8427165D0 (en) * 1984-10-26 1984-12-05 British Telecomm Adaptive recognising device
NZ214905A (en) * 1985-01-29 1988-09-29 British Telecomm Noise cancellation by adaptive filter compensates for timing variations
US4811342A (en) * 1985-11-12 1989-03-07 Racal Data Communications Inc. High speed analog echo canceller
US4805215A (en) * 1986-10-01 1989-02-14 Racal Data Communications Inc. Adaptive echo canceller with sparse dynamically positioned taps
EP0333718B1 (en) * 1986-10-01 1992-06-03 Racal-Datacom Inc. Echo canceller with adaptive dynamically positioned taps
ES2033814T3 (es) * 1986-11-17 1993-04-01 Alcatel N.V. Cancelador de eco ajustable.
US4813073A (en) * 1987-07-02 1989-03-14 Codex Corporation Echo cancellation
FR2618925B1 (fr) * 1987-07-30 1989-12-15 Rault Jean Dispositif de calcul numerique pour installation de transmission de donnees en code 2b 1q ou analogue
US5065242A (en) * 1990-06-29 1991-11-12 General Electric Company Deghosting apparatus using pseudorandom sequences
JPH0527019U (ja) * 1991-09-19 1993-04-06 俊子 阿曽 保冷帽子
FR2682252B1 (fr) * 1991-10-04 1995-11-03 Prescom Sarl Procede de traitement de signal et dispositif de prise et de restitution de son mettant en óoeuvre ce procede.
FR2713417B1 (fr) * 1993-12-02 1996-02-02 Europ Agence Spatiale Procédé de réglage adaptatif d'un suppresseur d'écho.
US5592548A (en) * 1995-05-31 1997-01-07 Qualcomm Incorporated System and method for avoiding false convergence in the presence of tones in a time-domain echo cancellation process
US5920548A (en) * 1996-10-01 1999-07-06 Telefonaktiebolaget L M Ericsson Echo path delay estimation
JP3779267B2 (ja) * 2000-07-11 2006-05-24 サムスン エレクトロニクス カンパニー リミテッド 単一キャリアデジタルテレビ放送システムのための反復−ｐｎ１０２３−シーケンス反響−消去参照信号
RU2174738C1 (ru) * 2000-10-31 2001-10-10 ЗАО "НПО "Кросна" Способ групповой эхокомпенсации и групповой эхокомпенсатор
US7881460B2 (en) * 2005-11-17 2011-02-01 Microsoft Corporation Configuration of echo cancellation
US20070112563A1 (en) * 2005-11-17 2007-05-17 Microsoft Corporation Determination of audio device quality

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2795865A (en) * 1954-03-29 1957-06-18 Backiel Mary Protective foot covering
US3735055A (en) * 1971-11-05 1973-05-22 Bell Telephone Labor Inc Method for improving the settling time of a transversal filter adaptive echo canceller
US3795865A (en) * 1972-02-23 1974-03-05 Honeywell Inf Systems Automated real time equalized modem
FR2337465A1 (fr) * 1975-12-30 1977-07-29 Ibm France Procede et dispositif pour determiner les valeurs initiales des coefficients d'un egaliseur transversal complexe
AU514263B2 (en) * 1977-01-17 1981-01-29 T.R.T. Digital echo canceller
FR2460075B1 (fr) * 1979-06-22 1988-12-09 Cit Alcatel Annuleur d'echo adaptatif pour transmission de donnees en duplex
NL7905577A (nl) * 1979-07-18 1981-01-20 Philips Nv Inrichting met een niet-recursieffilter.
US4425483A (en) * 1981-10-13 1984-01-10 Northern Telecom Limited Echo cancellation using transversal filters

Also Published As

Publication number Publication date
SU1308208A3 (ru) 1987-04-30
JPS58114534A (ja) 1983-07-07
NO824130L (no) 1983-06-10
FI74845B (fi) 1987-11-30
HU186186B (en) 1985-06-28
FI824217A0 (fi) 1982-12-08
ES517955A0 (es) 1983-09-16
CA1208733A (en) 1986-07-29
EP0081437A1 (fr) 1983-06-15
FR2517905B1 (fr) 1985-11-29
DE3275799D1 (en) 1987-04-23
US4578544A (en) 1986-03-25
FI824217L (fi) 1983-06-10
FI74845C (fi) 1988-03-10
NO156628C (no) 1987-10-21
FR2517905A1 (fr) 1983-06-10
EP0081437B1 (fr) 1987-03-18
NO156628B (no) 1987-07-13
DK545682A (da) 1983-06-10

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