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
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.
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)
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)
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 |
-
1992
- 1992-04-09 SE SE9201145A patent/SE470119B/sv not_active IP Right Cessation
-
1993
- 1993-03-11 WO PCT/SE1993/000218 patent/WO1993021695A1/en active IP Right Grant
- 1993-03-11 KR KR1019940703593A patent/KR100271343B1/ko not_active IP Right Cessation
- 1993-03-11 AU AU39638/93A patent/AU668558B2/en not_active Ceased
- 1993-03-11 AT AT93909104T patent/ATE179849T1/de not_active IP Right Cessation
- 1993-03-11 DE DE69324806T patent/DE69324806T2/de not_active Expired - Fee Related
- 1993-03-11 DK DK93909104T patent/DK0635178T3/da active
- 1993-03-11 BR BR9306205A patent/BR9306205A/pt not_active IP Right Cessation
- 1993-03-11 ES ES93909104T patent/ES2132229T3/es not_active Expired - Lifetime
- 1993-03-11 JP JP5518219A patent/JPH07505986A/ja active Pending
- 1993-03-11 CA CA002131890A patent/CA2131890A1/en not_active Abandoned
- 1993-03-11 EP EP93909104A patent/EP0635178B1/en not_active Expired - Lifetime
- 1993-04-08 US US08/044,050 patent/US5446787A/en not_active Expired - Lifetime
-
1994
- 1994-10-07 FI FI944726A patent/FI944726A/fi unknown
- 1994-10-07 NO NO943781A patent/NO306919B1/no not_active IP Right Cessation
-
1999
- 1999-07-13 GR GR990401832T patent/GR3030748T3/el unknown
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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Legal Events
Date | Code | Title | Description |
---|---|---|---|
FG2A | Definitive protection |
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