TW281833B - Method and apparatus for reducing residual far-end echo in voice communications networks - Google Patents

Method and apparatus for reducing residual far-end echo in voice communications networks

Info

Publication number
TW281833B
TW281833B TW085100897A TW85100897A TW281833B TW 281833 B TW281833 B TW 281833B TW 085100897 A TW085100897 A TW 085100897A TW 85100897 A TW85100897 A TW 85100897A TW 281833 B TW281833 B TW 281833B
Authority
TW
Taiwan
Prior art keywords
far
signals
template
communications networks
voice communications
Prior art date
Application number
TW085100897A
Other languages
Chinese (zh)
Inventor
Michael Velardo Patrick Jr
Dale Wynn Woodson
Original Assignee
At & T Corp
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
Priority claimed from US08/398,272 external-priority patent/US5587998A/en
Application filed by At & T Corp filed Critical At & T Corp
Application granted granted Critical
Publication of TW281833B publication Critical patent/TW281833B/en

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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Dc Digital Transmission (AREA)

Abstract

A method and apparatus are described for reducing, in communication signals received by a local network from a remote network (FAR-IN signals), that energy content that is attributable to echoes of signals transmitted into the local network (NEAR-IN signals). This is achieved, in part, by generating a time-varying TEMPLATE signal which represents the smoothed energy content of NEAR-IN signals delayed according to the echo path and attenuated by an estimated echo transmission loss. A non-linear processor passes the FAR-IN signal substantially without attenuation if it exceeds the TEMPLATE, but attenuates the FAR-IN signal if it lies within a defined range below the TEMPLATE.
TW085100897A 1995-03-03 1996-01-25 Method and apparatus for reducing residual far-end echo in voice communications networks TW281833B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US08/398,272 US5587998A (en) 1995-03-03 1995-03-03 Method and apparatus for reducing residual far-end echo in voice communication networks

Publications (1)

Publication Number Publication Date
TW281833B true TW281833B (en) 1996-07-21

Family

ID=23574727

Family Applications (1)

Application Number Title Priority Date Filing Date
TW085100897A TW281833B (en) 1995-03-03 1996-01-25 Method and apparatus for reducing residual far-end echo in voice communications networks

Country Status (4)

Country Link
KR (1) KR970703071A (en)
IL (1) IL117329A (en)
PE (1) PE46097A1 (en)
TW (1) TW281833B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI703561B (en) * 2018-09-25 2020-09-01 塞席爾商元鼎音訊股份有限公司 Sound cancellation method and electronic device performing the same

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1208769B (en) * 1983-10-12 1989-07-10 Cselt Centro Studi Lab Telecom THERISTICS VARIATIONS OVER TIME PROCEDURE AND DEVICE FOR THE NUMERICAL CANCELLATION OF THE ECO GENERATED IN CONNECTIONS WITH CARAT
JPS61161034A (en) * 1985-01-09 1986-07-21 Matsushita Electric Ind Co Ltd Echo cancelling device
JPS62116025A (en) * 1985-11-15 1987-05-27 Nippon Telegr & Teleph Corp <Ntt> Echo canceler
JPH03127518A (en) * 1989-10-13 1991-05-30 Matsushita Electric Ind Co Ltd Echo canceller
US4947425A (en) * 1989-10-27 1990-08-07 At&T Bell Laboratories Echo measurement arrangement
JP2508574B2 (en) * 1992-11-10 1996-06-19 日本電気株式会社 Multi-channel eco-removal device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI703561B (en) * 2018-09-25 2020-09-01 塞席爾商元鼎音訊股份有限公司 Sound cancellation method and electronic device performing the same

Also Published As

Publication number Publication date
MX9605354A (en) 1998-05-31
IL117329A (en) 1999-08-17
KR970703071A (en) 1997-06-10
IL117329A0 (en) 1996-07-23
PE46097A1 (en) 1997-12-03

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