BR9807321A - Aparelho e método para adaptar um cancelador de eco e um sistema de comunicação - Google Patents

Aparelho e método para adaptar um cancelador de eco e um sistema de comunicação

Info

Publication number
BR9807321A
BR9807321A BR9807321-4A BR9807321A BR9807321A BR 9807321 A BR9807321 A BR 9807321A BR 9807321 A BR9807321 A BR 9807321A BR 9807321 A BR9807321 A BR 9807321A
Authority
BR
Brazil
Prior art keywords
echo canceller
communication system
far
adapting
digital
Prior art date
Application number
BR9807321-4A
Other languages
English (en)
Inventor
Lijun Tan
Hanya Liu
Original Assignee
Motorola Inc
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 Motorola Inc filed Critical Motorola Inc
Publication of BR9807321A publication Critical patent/BR9807321A/pt

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
    • H04B3/237—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 two adaptive filters, e.g. for near end and for end echo cancelling
    • 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)
  • Telephonic Communication Services (AREA)

Abstract

<B> APARELHO E MéTODO PARA ADAPTAR UM CANCELADOR DE ECO EM UM SISTEMA DE COMUNICAçãO <D>. Aparelho e método para adaptar um cancelador de eco em um sistema de comunicação que reduz um número de derivações no filtro do cancelador de eco visando a reduzir o volume de recursos de processamento consumidos pelo cancelador de eco. Um cancelador de eco da extremidade próxima é desativado se o modem operar no lado digital de uma conexão digital/analógica. Um cancelador de eco da extremidade distante é desativado se o modem operar no lado analógico de uma conexão digital/analógica ou se o retardo de ida e volta estiver abaixo de um nível predeterminado. O cancelador de eco da extremidade distante é truncado se a faixa do cancelador de eco da extremidade distante de sobrepuser à faixa do cancelador de eco da extremidade próxima. Finalmente, derivações de filtro não essenciais são eliminadas de cada filtro do cancelador de eco.
BR9807321-4A 1997-12-12 1998-11-13 Aparelho e método para adaptar um cancelador de eco e um sistema de comunicação BR9807321A (pt)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US98969297A 1997-12-12 1997-12-12
PCT/US1998/024365 WO1999031866A1 (en) 1997-12-12 1998-11-13 Apparatus and method for adapting an echo canceller in a communication system

Publications (1)

Publication Number Publication Date
BR9807321A true BR9807321A (pt) 2000-04-18

Family

ID=25535373

Family Applications (1)

Application Number Title Priority Date Filing Date
BR9807321-4A BR9807321A (pt) 1997-12-12 1998-11-13 Aparelho e método para adaptar um cancelador de eco e um sistema de comunicação

Country Status (7)

Country Link
EP (1) EP0960521A4 (pt)
CN (1) CN1247664A (pt)
AU (1) AU1411299A (pt)
BR (1) BR9807321A (pt)
CA (1) CA2279360C (pt)
ID (1) ID27681A (pt)
WO (1) WO1999031866A1 (pt)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6480532B1 (en) * 1999-07-13 2002-11-12 Stmicroelectronics, Inc. Echo cancellation for an ADSL modem
EP1117191A1 (en) * 2000-01-13 2001-07-18 Telefonaktiebolaget Lm Ericsson Echo cancelling method
EP1286509A3 (de) * 2001-08-21 2004-02-04 Siemens Aktiengesellschaft Verfahren und Vorrichtung zur Echokompensation in einem Telekommunikationsnetz
SE525053C2 (sv) * 2002-04-26 2004-11-16 Global Ip Sound Europ Ab Ekosläckning
EP1599948B1 (de) * 2002-07-02 2006-05-31 Siemens Aktiengesellschaft Laufzeitabhängige Abschaltung der Echokompensation in einem Paketnetz
DE112004001455B4 (de) 2003-08-07 2020-04-23 Intersil Americas LLC Verfahren und System zum Löschen von Übersprechen
DE602005020662D1 (de) 2004-10-13 2010-05-27 Koninkl Philips Electronics Nv Echolöschung
US10177810B2 (en) * 2016-09-02 2019-01-08 Marvell World Trade Ltd. Systems and methods for echo or interference cancellation power-saving management in a communication system

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4742510A (en) * 1986-04-04 1988-05-03 Massachusetts Institute Of Technology Near and far echo canceller for data communications
JPH0650829B2 (ja) * 1986-09-16 1994-06-29 日本電気株式会社 エコ−キヤンセラ方式モデム
US4970715A (en) * 1987-03-27 1990-11-13 Universal Data Systems, Inc. Modem with improved remote echo location and cancellation
US4995030A (en) * 1988-02-01 1991-02-19 Memotec Datacom, Inc. Far end echo cancellation method and apparatus
EP0403716B1 (en) * 1989-06-22 1995-09-13 International Business Machines Corporation Echo cancelling device providing adjustment of the echo canceller coefficients during full-duplex transmission
US5280473A (en) * 1990-02-08 1994-01-18 Universal Data Systems, Inc. Modem with echo cancellation
EP0543568A2 (en) * 1991-11-22 1993-05-26 AT&T Corp. High resolution filtering using low resolution processors
US5353348A (en) * 1993-05-14 1994-10-04 Jrc International, Inc. Double echo cancelling system

Also Published As

Publication number Publication date
AU1411299A (en) 1999-07-05
CA2279360A1 (en) 1999-06-24
EP0960521A1 (en) 1999-12-01
CN1247664A (zh) 2000-03-15
WO1999031866A1 (en) 1999-06-24
ID27681A (id) 2001-04-19
EP0960521A4 (en) 2004-08-04
CA2279360C (en) 2002-10-22

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Legal Events

Date Code Title Description
B08F Application dismissed because of non-payment of annual fees [chapter 8.6 patent gazette]

Free format text: REFERENTE A 9A E 10A ANUIDADES.

B08K Patent lapsed as no evidence of payment of the annual fee has been furnished to inpi [chapter 8.11 patent gazette]

Free format text: REFERENTE AO DESPACHO 8.6 DA RPI 2008 DE 30/06/2009.