ES2033814T3 - Cancelador de eco ajustable. - Google Patents
Cancelador de eco ajustable.Info
- Publication number
- ES2033814T3 ES2033814T3 ES198787202193T ES87202193T ES2033814T3 ES 2033814 T3 ES2033814 T3 ES 2033814T3 ES 198787202193 T ES198787202193 T ES 198787202193T ES 87202193 T ES87202193 T ES 87202193T ES 2033814 T3 ES2033814 T3 ES 2033814T3
- Authority
- ES
- Spain
- Prior art keywords
- canceller
- canceler
- coefficients
- measures
- adjustable
- 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
- 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)
- Optical Communication System (AREA)
- Filters That Use Time-Delay Elements (AREA)
- Networks Using Active Elements (AREA)
- Electrotherapy Devices (AREA)
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
- Primary Cells (AREA)
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
SE PRESENTA UN ANULADOR AJUSTABLE USADO EN UN SISTEMA DE COMUNICACION QUE INCLUYE UN FILTRO DIGITAL (DIH) LOS COEFICIENTES DEL CUAL (A0-A3,B) SE CALCULAN MEDIANTE PROGRAMAS DE SOFTWARE (PROG1-PROG4) DESPUES DE LA MEDIDA DE LAS SEÑALES. LA CONTRIBUCION DE ESTOS COEFICIENTES A LA SEÑAL DE SALIDA DEL ANULADOR SE MIDEN Y SE COMPARAN A MEDIDAS DE UNA SEÑAL DEL ECO OBTENIDA CUANDO EL FILTRO NO ESTA ACTIVO. ESTAS MEDIDAS SE REALIZAN DESDE LUGARES COMUNES A VARIOS CIRCUITOS DE COMUNICACION CADA UNO DE LOS CUALES INCLUYE UN ANULADOR.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE2/61088A BE905760A (fr) | 1986-11-16 | 1986-11-17 | Compensateur d'echo reglable. |
Publications (1)
Publication Number | Publication Date |
---|---|
ES2033814T3 true ES2033814T3 (es) | 1993-04-01 |
Family
ID=3865839
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ES198787202193T Expired - Lifetime ES2033814T3 (es) | 1986-11-17 | 1987-11-11 | Cancelador de eco ajustable. |
Country Status (9)
Country | Link |
---|---|
US (1) | US4862449A (es) |
EP (1) | EP0272714B1 (es) |
JP (1) | JPH0831779B2 (es) |
CN (1) | CN1014575B (es) |
AT (1) | ATE77719T1 (es) |
DE (1) | DE3780013T2 (es) |
ES (1) | ES2033814T3 (es) |
NO (1) | NO180137C (es) |
YU (1) | YU206887A (es) |
Families Citing this family (28)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0748681B2 (ja) * | 1989-02-23 | 1995-05-24 | 日本電気株式会社 | エコー消去器の係数制御方法 |
JPH04369932A (ja) * | 1991-06-19 | 1992-12-22 | Hitachi Ltd | エコーキャンセラ、および、それを用いた伝送装置 |
DE4124834A1 (de) * | 1991-07-26 | 1993-01-28 | Telefunken Systemtechnik | Verfahren zur signalverarbeitung |
ES2038904B1 (es) * | 1991-09-10 | 1995-01-16 | Alcatel Standard Electrica | Procedimiento y dispositivo de cancelacion adaptativa de ecos acusticos. |
JP2792311B2 (ja) * | 1992-01-31 | 1998-09-03 | 日本電気株式会社 | 多チャンネルエコー除去方法および装置 |
US5404397A (en) * | 1992-04-16 | 1995-04-04 | U.S. Phillips Corporation | Conference system with automatic speaker detection and speaker unit |
JPH0669834A (ja) * | 1992-08-24 | 1994-03-11 | Mitsubishi Electric Corp | 2線4線変換器 |
US5410595A (en) * | 1992-11-12 | 1995-04-25 | Motorola, Inc. | Apparatus and method for noise reduction for a full-duplex speakerphone or the like |
US5617423A (en) * | 1993-01-08 | 1997-04-01 | Multi-Tech Systems, Inc. | Voice over data modem with selectable voice compression |
US5452289A (en) * | 1993-01-08 | 1995-09-19 | Multi-Tech Systems, Inc. | Computer-based multifunction personal communications system |
US5546395A (en) * | 1993-01-08 | 1996-08-13 | Multi-Tech Systems, Inc. | Dynamic selection of compression rate for a voice compression algorithm in a voice over data modem |
US6009082A (en) * | 1993-01-08 | 1999-12-28 | Multi-Tech Systems, Inc. | Computer-based multifunction personal communication system with caller ID |
US5453986A (en) * | 1993-01-08 | 1995-09-26 | Multi-Tech Systems, Inc. | Dual port interface for a computer-based multifunction personal communication system |
US5812534A (en) * | 1993-01-08 | 1998-09-22 | Multi-Tech Systems, Inc. | Voice over data conferencing for a computer-based personal communications system |
US5535204A (en) * | 1993-01-08 | 1996-07-09 | Multi-Tech Systems, Inc. | Ringdown and ringback signalling for a computer-based multifunction personal communications system |
US5864560A (en) * | 1993-01-08 | 1999-01-26 | Multi-Tech Systems, Inc. | Method and apparatus for mode switching in a voice over data computer-based personal communications system |
US5754589A (en) * | 1993-01-08 | 1998-05-19 | Multi-Tech Systems, Inc. | Noncompressed voice and data communication over modem for a computer-based multifunction personal communications system |
FR2713417B1 (fr) * | 1993-12-02 | 1996-02-02 | Europ Agence Spatiale | Procédé de réglage adaptatif d'un suppresseur d'écho. |
US5682386A (en) | 1994-04-19 | 1997-10-28 | Multi-Tech Systems, Inc. | Data/voice/fax compression multiplexer |
US5757801A (en) | 1994-04-19 | 1998-05-26 | Multi-Tech Systems, Inc. | Advanced priority statistical multiplexer |
DE19548658A1 (de) * | 1995-12-18 | 1997-06-19 | Biotronik Mess & Therapieg | Extrakorporales Kontrollgerät für ein implantierbares medizinisches Gerät |
JP3097586B2 (ja) * | 1997-03-06 | 2000-10-10 | 日本電気株式会社 | 信号検出器 |
US6256383B1 (en) * | 1997-11-07 | 2001-07-03 | Legerity, Inc. | IIR filter of adaptive balance circuit for long tail echo cancellation |
US6674856B1 (en) * | 1999-09-23 | 2004-01-06 | Agere Systems Inc. | Placement of a transmit predistortion filter with respect to a data access arrangement |
US7095720B1 (en) * | 2001-10-17 | 2006-08-22 | Sprint Communications Company L.P. | Trunk level echo canceller test system |
US6701335B2 (en) * | 2002-02-27 | 2004-03-02 | Lecroy Corporation | Digital frequency response compensator and arbitrary response generator system |
US6963643B1 (en) | 2002-06-14 | 2005-11-08 | Xilinx, Inc. | Method and apparatus for canceling echo in a telephone communication system |
CN1655468B (zh) * | 2004-02-09 | 2010-05-05 | 瑞昱半导体股份有限公司 | 用于全双工通信系统的可调式回音消除装置 |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3632905A (en) * | 1969-12-19 | 1972-01-04 | Bell Telephone Labor Inc | Method for improving the settling time of a transversal filter adaptive echo canceller |
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 |
JPS6046899B2 (ja) * | 1980-09-26 | 1985-10-18 | 日本電気株式会社 | 反響消去装置 |
FR2517905B1 (fr) * | 1981-12-09 | 1985-11-29 | Telecommunications Sa | Dispositif d'initialisation pour annuleur d'echo et son application aux echos lointains |
DE3208214A1 (de) * | 1982-03-06 | 1983-09-15 | Standard Elektrik Lorenz Ag, 7000 Stuttgart | Adaptive echokompensationseinrichtung zur digitalen duplexuebertragung auf zweidrahtleitungen |
JPS58204633A (ja) * | 1982-05-24 | 1983-11-29 | Toshiba Corp | エコ−・キャンセラ |
CA1186764A (en) * | 1982-06-23 | 1985-05-07 | Akira Kanemasa | Echo canceler |
EP0122594A3 (en) * | 1983-04-18 | 1986-09-10 | International Standard Electric Corporation | Line circuit with echo compensation |
BE897773A (nl) * | 1983-09-19 | 1984-03-19 | Bell Telephone Mfg Cy | Pulse code modulatie omzetter |
BE897772A (fr) * | 1983-09-19 | 1984-03-19 | Itt Ind Belgium | Contacts electroniques et dispositifs associes |
BE898960A (fr) * | 1984-02-21 | 1984-08-21 | Itt Ind Belgium | Systeme de commutation applicable aux telecommunications |
US4717848A (en) * | 1984-09-13 | 1988-01-05 | Alcatel N.V. | Electronic circuits and signal generator using them |
AU585337B2 (en) * | 1985-04-26 | 1989-06-15 | Alcatel N.V. | An electronic switch |
-
1987
- 1987-11-11 AT AT87202193T patent/ATE77719T1/de not_active IP Right Cessation
- 1987-11-11 EP EP87202193A patent/EP0272714B1/en not_active Expired - Lifetime
- 1987-11-11 DE DE8787202193T patent/DE3780013T2/de not_active Expired - Fee Related
- 1987-11-11 ES ES198787202193T patent/ES2033814T3/es not_active Expired - Lifetime
- 1987-11-11 NO NO874684A patent/NO180137C/no not_active IP Right Cessation
- 1987-11-16 YU YU02068/87A patent/YU206887A/xx unknown
- 1987-11-16 US US07/120,848 patent/US4862449A/en not_active Expired - Fee Related
- 1987-11-17 CN CN87107849A patent/CN1014575B/zh not_active Expired
- 1987-11-17 JP JP62290446A patent/JPH0831779B2/ja not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPS63313921A (ja) | 1988-12-22 |
CN1014575B (zh) | 1991-10-30 |
NO874684L (no) | 1988-05-18 |
US4862449A (en) | 1989-08-29 |
NO180137C (no) | 1997-02-19 |
DE3780013D1 (de) | 1992-07-30 |
YU206887A (en) | 1991-04-30 |
NO180137B (no) | 1996-11-11 |
JPH0831779B2 (ja) | 1996-03-27 |
CN1031166A (zh) | 1989-02-15 |
DE3780013T2 (de) | 1993-01-21 |
EP0272714B1 (en) | 1992-06-24 |
NO874684D0 (no) | 1987-11-11 |
ATE77719T1 (de) | 1992-07-15 |
EP0272714A1 (en) | 1988-06-29 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
FG2A | Definitive protection |
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