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
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)
- Bidirectional Digital Transmission (AREA)
- Telephonic Communication Services (AREA)
- Hardware Redundancy (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (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.
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 |
---|---|
ES8308663A1 true ES8308663A1 (es) | 1983-09-16 |
ES517955A0 ES517955A0 (es) | 1983-09-16 |
Family
ID=9264821
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ES517955A Granted ES517955A0 (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) | ES517955A0 (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 (18)
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 |
WO1988002582A1 (en) * | 1986-10-01 | 1988-04-07 | Racal Data Communications Inc. | Echo canceller with adaptive dynamically positioned taps |
US4805215A (en) * | 1986-10-01 | 1989-02-14 | Racal Data Communications Inc. | Adaptive echo canceller with sparse dynamically positioned taps |
EP0272714B1 (en) * | 1986-11-17 | 1992-06-24 | Alcatel N.V. | Adjustable echo canceller |
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. |
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 |
US20070112563A1 (en) * | 2005-11-17 | 2007-05-17 | Microsoft Corporation | Determination of audio device quality |
US7881460B2 (en) * | 2005-11-17 | 2011-02-01 | Microsoft Corporation | Configuration of echo cancellation |
Family Cites Families (8)
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 |
DE2801375C3 (de) * | 1977-01-17 | 1982-01-28 | Télécommunications Radioélectriques et Téléphoniques T.R.T., 75013 Paris | Digitaler Echokompensator für einen Modem zur Datenübertragung mit Hilfe von Modulation eines Trägers |
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. |
CA1173128A (en) * | 1981-10-13 | 1984-08-21 | Pok F. Lee | Echo cancellation using transversal filters |
-
1981
- 1981-12-09 FR FR8122984A patent/FR2517905B1/fr not_active Expired
-
1982
- 1982-12-06 ES ES517955A patent/ES517955A0/es active Granted
- 1982-12-06 CA CA000417032A patent/CA1208733A/en not_active Expired
- 1982-12-06 US US06/447,242 patent/US4578544A/en not_active Expired - Fee Related
- 1982-12-08 EP EP82402244A patent/EP0081437B1/fr not_active Expired
- 1982-12-08 DE DE8282402244T patent/DE3275799D1/de not_active Expired
- 1982-12-08 HU HU823951A patent/HU186186B/hu unknown
- 1982-12-08 DK DK545682A patent/DK545682A/da not_active Application Discontinuation
- 1982-12-08 FI FI824217A patent/FI74845C/fi not_active IP Right Cessation
- 1982-12-08 SU SU823523577A patent/SU1308208A3/ru active
- 1982-12-08 NO NO824130A patent/NO156628C/no unknown
- 1982-12-09 JP JP57214731A patent/JPS58114534A/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
FR2517905A1 (fr) | 1983-06-10 |
SU1308208A3 (ru) | 1987-04-30 |
JPS58114534A (ja) | 1983-07-07 |
US4578544A (en) | 1986-03-25 |
DK545682A (da) | 1983-06-10 |
EP0081437B1 (fr) | 1987-03-18 |
HU186186B (en) | 1985-06-28 |
NO156628C (no) | 1987-10-21 |
FI824217L (fi) | 1983-06-10 |
ES517955A0 (es) | 1983-09-16 |
EP0081437A1 (fr) | 1983-06-15 |
NO824130L (no) | 1983-06-10 |
FI74845C (fi) | 1988-03-10 |
FR2517905B1 (fr) | 1985-11-29 |
NO156628B (no) | 1987-07-13 |
CA1208733A (en) | 1986-07-29 |
DE3275799D1 (en) | 1987-04-23 |
FI74845B (fi) | 1987-11-30 |
FI824217A0 (fi) | 1982-12-08 |
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