ES2041980T3 - Procedimiento y dispositivo para la cancelacion digital adaptable del eco generado en conexiones telefonicas con caracteristicas cronovariables. - Google Patents
Procedimiento y dispositivo para la cancelacion digital adaptable del eco generado en conexiones telefonicas con caracteristicas cronovariables.Info
- Publication number
- ES2041980T3 ES2041980T3 ES198989203107T ES89203107T ES2041980T3 ES 2041980 T3 ES2041980 T3 ES 2041980T3 ES 198989203107 T ES198989203107 T ES 198989203107T ES 89203107 T ES89203107 T ES 89203107T ES 2041980 T3 ES2041980 T3 ES 2041980T3
- Authority
- ES
- Spain
- Prior art keywords
- eco
- procedure
- adaptable
- chronovariable
- telephone connections
- 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 - Lifetime
Links
- 238000000034 method Methods 0.000 title abstract 3
- 238000004364 calculation method Methods 0.000 abstract 2
- 238000001914 filtration Methods 0.000 abstract 2
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
- H04B3/234—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 double talk detection
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Telephone Function (AREA)
Abstract
SE DESCRIBE UN PROCEDIMIENTO PARA LA CANCELACION DEL ECO PRODUCIDO EN CONEXIONES TELEFONICAS, CON CARACTERISTICAS CRONOVARIANTES TALES COMO, POR EJEMPLO, LAS AFECTADAS POR RODILLO DE FASE. EL CANCELADOR DE ECO OBTENIDO DE CONFORMIDAD CON EL PROCEDIMIENTO QUE CONSTITUYE LA FINALIDAD DE ESTA INVENCION, GENERA UNA ESTIMACION DE LA SEÑAL DEL ECO POR MEDIO DE UNA FILTRACION DIGITAL ADECUADA DE LA SEÑAL ORIGINADA POR EL COLATERAL DEL EXTREMO DISTANTE. EL ECO ESTIMADO SE DETRAE DESPUES DEL ECO ACTUAL. EL FILTRADO SE ACTIVA MEDIANTE UN FILTRO DIGITAL IIR (FTR = FEDERAL TELEPHONE AND RADIO CORPORATION), CUYOS COEFICIENTES ADAPTABLES SE ACTUALIZAN MEDIANTE EL USO DE UN ALGORITMO ADAPTABLE, BASADO EN LA DECIMACION DEL ERROR CUADRADO. LA ALTA VELOCIDAD DE CONVERGENCIA DEL CITADO ALGORITMO EN EL CALCULO DE LA FASE DE CORRECCION DE COEFICIENTE, PERMITE UN CALCULO CORRECTO DEL ECO, INCLUSO EN EL CASO DE CONEXIONES AFECTADAS POR EL RODILLO DE FASE
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT8823032A IT1228106B (it) | 1988-12-21 | 1988-12-21 | Procedimento e dispositivo per la cancellazione numerica adattativa dell'eco generato in collegamenti telefonici con caratteristiche varianti nel tempo |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| ES2041980T3 true ES2041980T3 (es) | 1993-12-01 |
Family
ID=11203092
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ES198989203107T Expired - Lifetime ES2041980T3 (es) | 1988-12-21 | 1989-12-07 | Procedimiento y dispositivo para la cancelacion digital adaptable del eco generado en conexiones telefonicas con caracteristicas cronovariables. |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0375015B1 (es) |
| AT (1) | ATE87779T1 (es) |
| DE (1) | DE68905782T2 (es) |
| ES (1) | ES2041980T3 (es) |
| IT (1) | IT1228106B (es) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2038887B1 (es) * | 1991-04-18 | 1995-05-01 | Aplicaciones Electronicas Quas | Hibrida digital para multiconferencia. |
| ES2038904B1 (es) * | 1991-09-10 | 1995-01-16 | Alcatel Standard Electrica | Procedimiento y dispositivo de cancelacion adaptativa de ecos acusticos. |
| IT1254819B (it) * | 1992-02-24 | 1995-10-11 | Sits Soc It Telecom Siemens | Procedimento e dispositivo per la cancellazione numerica adattativa dell'eco generato in collegamenti telefonici non stazionari |
| FI935834A (fi) * | 1993-12-23 | 1995-06-24 | Nokia Telecommunications Oy | Menetelmä kaikukohtaan sovittautumiseksi kaiunpoistajassa |
| US5535194A (en) * | 1994-07-14 | 1996-07-09 | Motorola, Inc. | Method and apparatus for echo canceling with double-talk immunity |
| SE516835C2 (sv) * | 1995-02-15 | 2002-03-12 | Ericsson Telefon Ab L M | Ekosläckningsförfarande |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57212831A (en) * | 1981-06-24 | 1982-12-27 | Kokusai Denshin Denwa Co Ltd <Kdd> | Echo controlling system |
| IT1208769B (it) * | 1983-10-12 | 1989-07-10 | Cselt Centro Studi Lab Telecom | Teristiche varianti nel tempo procedimento e dispositivo per la cancellazione numerica dell eco generato in collegamenti con carat |
-
1988
- 1988-12-21 IT IT8823032A patent/IT1228106B/it active
-
1989
- 1989-12-07 ES ES198989203107T patent/ES2041980T3/es not_active Expired - Lifetime
- 1989-12-07 AT AT89203107T patent/ATE87779T1/de not_active IP Right Cessation
- 1989-12-07 EP EP89203107A patent/EP0375015B1/en not_active Expired - Lifetime
- 1989-12-07 DE DE8989203107T patent/DE68905782T2/de not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| ATE87779T1 (de) | 1993-04-15 |
| DE68905782T2 (de) | 1993-08-26 |
| EP0375015B1 (en) | 1993-03-31 |
| EP0375015A2 (en) | 1990-06-27 |
| DE68905782D1 (de) | 1993-05-06 |
| EP0375015A3 (en) | 1992-04-01 |
| IT8823032A0 (it) | 1988-12-21 |
| IT1228106B (it) | 1991-05-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FG2A | Definitive protection |
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