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
Application number
ES198989203107T
Other languages
English (en)
Inventor
Giacomo Cannalire
Giacomo Premoli
Roberto Ravasio
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.)
Siemens Telecomunicazioni SpA
Original Assignee
Siemens Telecomunicazioni SpA
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 Siemens Telecomunicazioni SpA filed Critical Siemens Telecomunicazioni SpA
Application granted granted Critical
Publication of ES2041980T3 publication Critical patent/ES2041980T3/es
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H04B3/234—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
ES198989203107T 1988-12-21 1989-12-07 Procedimiento y dispositivo para la cancelacion digital adaptable del eco generado en conexiones telefonicas con caracteristicas cronovariables. Expired - Lifetime ES2041980T3 (es)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
EP0375015A2 (en) 1990-06-27
IT1228106B (it) 1991-05-28
IT8823032A0 (it) 1988-12-21
ATE87779T1 (de) 1993-04-15
EP0375015A3 (en) 1992-04-01
DE68905782D1 (de) 1993-05-06
DE68905782T2 (de) 1993-08-26
EP0375015B1 (en) 1993-03-31

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