CA2279360A1 - Apparatus and method for adapting an echo canceller in a communication system - Google Patents

Apparatus and method for adapting an echo canceller in a communication system Download PDF

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Publication number
CA2279360A1
CA2279360A1 CA002279360A CA2279360A CA2279360A1 CA 2279360 A1 CA2279360 A1 CA 2279360A1 CA 002279360 A CA002279360 A CA 002279360A CA 2279360 A CA2279360 A CA 2279360A CA 2279360 A1 CA2279360 A1 CA 2279360A1
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CA
Canada
Prior art keywords
echo canceller
adapting
communication system
far
digital
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.)
Granted
Application number
CA002279360A
Other languages
French (fr)
Other versions
CA2279360C (en
Inventor
Hanyu Liu
Lijun Tan
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.)
Motorola Solutions Inc
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Individual
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 Individual filed Critical Individual
Publication of CA2279360A1 publication Critical patent/CA2279360A1/en
Application granted granted Critical
Publication of CA2279360C publication Critical patent/CA2279360C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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

An apparatus and method for adapting an echo canceller in a communication system reduces the number of taps in the echo canceller filter in order to reduce the amount of processing resources consumed by the echo canceller. A
near-end echo canceller (406) is disabled if the modem (402) operates on the digital side of a digital-to-analog connection. A far-end echo canceller (408) is disabled if the modem (402) operates on the analog side of a digital-to-analog connection or if the round-trip delay is below a predetermined threshold. The far-end echo canceller (408) is truncated if the span of the far-end echo canceller overlaps the span of the near-end echo canceller (406).
CA002279360A 1997-12-12 1998-11-13 Apparatus and method for adapting an echo canceller in a communication system Expired - Fee Related CA2279360C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US98969297A 1997-12-12 1997-12-12
US08/989,692 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 (2)

Publication Number Publication Date
CA2279360A1 true CA2279360A1 (en) 1999-06-24
CA2279360C CA2279360C (en) 2002-10-22

Family

ID=25535373

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002279360A Expired - Fee Related CA2279360C (en) 1997-12-12 1998-11-13 Apparatus and method for adapting an echo canceller in a communication system

Country Status (7)

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

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 (en) * 2001-08-21 2004-02-04 Siemens Aktiengesellschaft Method and apparatus for echo compensation in a telecommunication network
SE525053C2 (en) * 2002-04-26 2004-11-16 Global Ip Sound Europ Ab echo cancellation
AU2003250747A1 (en) * 2002-07-02 2004-01-23 Siemens Aktiengesellschaft Runtime-dependent switching off of the echo compensation in packet networks
GB2421674B (en) 2003-08-07 2006-11-15 Quellan Inc Method and system for crosstalk cancellation
EP1803288B1 (en) 2004-10-13 2010-04-14 Koninklijke Philips Electronics N.V. Echo cancellation
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 (en) * 1986-09-16 1994-06-29 日本電気株式会社 Eco-Cancerra Modem
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
CN1247664A (en) 2000-03-15
EP0960521A4 (en) 2004-08-04
BR9807321A (en) 2000-04-18
AU1411299A (en) 1999-07-05
ID27681A (en) 2001-04-19
CA2279360C (en) 2002-10-22
EP0960521A1 (en) 1999-12-01
WO1999031866A1 (en) 1999-06-24

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