ES2132229T3 - Procedimiento para evitar las auto-oscilaciones durante la eliminacion del eco. - Google Patents

Procedimiento para evitar las auto-oscilaciones durante la eliminacion del eco.

Info

Publication number
ES2132229T3
ES2132229T3 ES93909104T ES93909104T ES2132229T3 ES 2132229 T3 ES2132229 T3 ES 2132229T3 ES 93909104 T ES93909104 T ES 93909104T ES 93909104 T ES93909104 T ES 93909104T ES 2132229 T3 ES2132229 T3 ES 2132229T3
Authority
ES
Spain
Prior art keywords
transfer function
loop
eco
removal
procedure
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
ES93909104T
Other languages
English (en)
Inventor
Bengt Gustav Lofmark
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Application granted granted Critical
Publication of ES2132229T3 publication Critical patent/ES2132229T3/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Pressure Sensors (AREA)
  • Oscillators With Electromechanical Resonators (AREA)
  • Vehicle Body Suspensions (AREA)
  • Percussion Or Vibration Massage (AREA)
  • Vibration Prevention Devices (AREA)
  • Gyroscopes (AREA)
  • Filters That Use Time-Delay Elements (AREA)

Abstract

LA INVENCION SE REFIERE A UN METODO PARA EVITAR LA AUTOOSCILACION EN UN BUCLE DE CUATRO HILOS EN CONJUNCION CON CANCELACION DE ECO EFECTUADO CON LA AYUDA DE UN FILTRO ADAPTADOR (15). SE EVITA LA AUTOOSCILACION TANTO PARA CONEXIONES LARGAS COMO CORTAS Y TAMBIEN CUANDO SE INDICA CON SEÑALES DE BANDA ESTRECHA, RESTRINGIENDO LA GAMA PERMITIDA DE LOS COEFICIENTES DEL FILTRO ADAPTADOR DE MANERA QUE EL VALOR ABSOLUTO DE LA FUNCION DE TRANSFERENCIA DE FILTRO SEA SUFICIENTEMENTE PEQUEÑA PARA LA AMPLIFICACION EN EL BUCLE DE CUATRO HILOS PARA SER MENOS DE UNO. ESTO SE LLEVA A CABO LIMITANDO EL VALOR ABSOLUTO DE LA FUNCION DE TRANSFERENCIA DE FILTRO /HCA/, A UN VALOR QUE ES INFERIOR A UNA FUNCION DETERMINADA DE LA FUNCION DE TRANSFERENCIA DE ECO /HFA/ EN EL EXTREMO LEJANO (13) DEL BUCLE Y LA FUNCION DE TRANSFERENCIA DE ECO HNE EN EL EXTREMO CERCANO (14) DEL BUCLE.
ES93909104T 1992-04-09 1993-03-11 Procedimiento para evitar las auto-oscilaciones durante la eliminacion del eco. Expired - Lifetime ES2132229T3 (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9201145A SE470119B (sv) 1992-04-09 1992-04-09 Metod för att undvika självsvängning i en fyrtrådsslinga i samband med ekosläckning

Publications (1)

Publication Number Publication Date
ES2132229T3 true ES2132229T3 (es) 1999-08-16

Family

ID=20385920

Family Applications (1)

Application Number Title Priority Date Filing Date
ES93909104T Expired - Lifetime ES2132229T3 (es) 1992-04-09 1993-03-11 Procedimiento para evitar las auto-oscilaciones durante la eliminacion del eco.

Country Status (16)

Country Link
US (1) US5446787A (es)
EP (1) EP0635178B1 (es)
JP (1) JPH07505986A (es)
KR (1) KR100271343B1 (es)
AT (1) ATE179849T1 (es)
AU (1) AU668558B2 (es)
BR (1) BR9306205A (es)
CA (1) CA2131890A1 (es)
DE (1) DE69324806T2 (es)
DK (1) DK0635178T3 (es)
ES (1) ES2132229T3 (es)
FI (1) FI944726A (es)
GR (1) GR3030748T3 (es)
NO (1) NO306919B1 (es)
SE (1) SE470119B (es)
WO (1) WO1993021695A1 (es)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5612996A (en) * 1995-09-21 1997-03-18 Rockwell International Corporation Loop gain processing system for speakerphone applications
US6243366B1 (en) * 1997-06-20 2001-06-05 At&T Corp. Method and apparatus for providing interactive two-way communications using a single one-way channel in satellite systems
KR100477638B1 (ko) * 2001-09-11 2005-03-23 삼성전자주식회사 ２ｄ／３ｄ 겸용 디스플레이
US7215765B2 (en) * 2002-06-24 2007-05-08 Freescale Semiconductor, Inc. Method and apparatus for pure delay estimation in a communication system
US7242762B2 (en) * 2002-06-24 2007-07-10 Freescale Semiconductor, Inc. Monitoring and control of an adaptive filter in a communication system
US6961423B2 (en) 2002-06-24 2005-11-01 Freescale Semiconductor, Inc. Method and apparatus for performing adaptive filtering
US7388954B2 (en) * 2002-06-24 2008-06-17 Freescale Semiconductor, Inc. Method and apparatus for tone indication
EP1668854A1 (en) * 2003-09-23 2006-06-14 Koninklijke Philips Electronics N.V. Adaptive filter
DE502006008685D1 (de) * 2006-11-17 2011-02-17 Siemens Ag Verfahren und anordnung zur steuerung von adaptiven filtern

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS583430A (ja) * 1981-06-30 1983-01-10 Nec Corp まわり込信号抑圧装置
US4712235A (en) * 1984-11-19 1987-12-08 International Business Machines Corporation Method and apparatus for improved control and time sharing of an echo canceller
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
US4894820A (en) * 1987-03-24 1990-01-16 Oki Electric Industry Co., Ltd. Double-talk detection in an echo canceller
US5111481A (en) * 1989-11-17 1992-05-05 Nynex Corporation Dual mode LMS channel equalizer

Also Published As

Publication number Publication date
DK0635178T3 (da) 1999-11-15
KR950701165A (ko) 1995-02-20
DE69324806T2 (de) 1999-10-07
GR3030748T3 (en) 1999-11-30
NO943781L (no) 1994-10-07
SE470119B (sv) 1993-11-08
DE69324806D1 (de) 1999-06-10
FI944726A0 (fi) 1994-10-07
FI944726A (fi) 1994-10-07
US5446787A (en) 1995-08-29
WO1993021695A1 (en) 1993-10-28
AU668558B2 (en) 1996-05-09
NO306919B1 (no) 2000-01-10
BR9306205A (pt) 1998-06-23
CA2131890A1 (en) 1993-10-28
SE9201145L (sv) 1993-10-10
ATE179849T1 (de) 1999-05-15
SE9201145D0 (sv) 1992-04-09
AU3963893A (en) 1993-11-18
EP0635178B1 (en) 1999-05-06
JPH07505986A (ja) 1995-06-29
EP0635178A1 (en) 1995-01-25
KR100271343B1 (ko) 2000-11-01
NO943781D0 (no) 1994-10-07

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