CA2205926A1 - Echo cancelling arrangements - Google Patents

Echo cancelling arrangements

Info

Publication number
CA2205926A1
CA2205926A1 CA002205926A CA2205926A CA2205926A1 CA 2205926 A1 CA2205926 A1 CA 2205926A1 CA 002205926 A CA002205926 A CA 002205926A CA 2205926 A CA2205926 A CA 2205926A CA 2205926 A1 CA2205926 A1 CA 2205926A1
Authority
CA
Canada
Prior art keywords
echo
attenuation
erle
inhibited
threshold value
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
CA002205926A
Other languages
French (fr)
Other versions
CA2205926C (en
Inventor
Quentin James Meek
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.)
Nortel Networks Ltd
Original Assignee
Northern Telecom Limited
Bell-Northern Research Ltd.
Nortel Networks Corporation
Quentin James Meek
Nortel Networks Limited
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 Northern Telecom Limited, Bell-Northern Research Ltd., Nortel Networks Corporation, Quentin James Meek, Nortel Networks Limited filed Critical Northern Telecom Limited
Publication of CA2205926A1 publication Critical patent/CA2205926A1/en
Application granted granted Critical
Publication of CA2205926C publication Critical patent/CA2205926C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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
    • H04B3/234—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 double talk detection

Abstract

Adaptation of an adaptive filter in an echo canceller is inhibited (48) after initial convergence (46) and is enabled (42) again in response to an echo attenuation parameter being less than a first threshold value (54) and a variation of an echo attenuation parameter being less than a second threshold value (56), this situation representing a detected echo path change. The detection of an echo path change is inhibited (53) in the presence of a near end signal. The echo attenuation parameters can be either or both of the ERLE
(echo return loss enhancement) or the combined attenuation of the ERLE plus the hybrid circuit ERL (echo return loss), these parameters being determined from averaged signal levels on the signal paths.
CA002205926A 1995-01-26 1996-01-17 Echo cancelling arrangements Expired - Fee Related CA2205926C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08/378,335 1995-01-26
US08/378,335 US5745564A (en) 1995-01-26 1995-01-26 Echo cancelling arrangement
PCT/CA1996/000024 WO1996023367A1 (en) 1995-01-26 1996-01-17 Adaptation control for echo canceller

Publications (2)

Publication Number Publication Date
CA2205926A1 true CA2205926A1 (en) 1996-08-01
CA2205926C CA2205926C (en) 2001-04-10

Family

ID=23492719

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002205926A Expired - Fee Related CA2205926C (en) 1995-01-26 1996-01-17 Echo cancelling arrangements

Country Status (7)

Country Link
US (1) US5745564A (en)
EP (1) EP0806093B1 (en)
JP (1) JP3288383B2 (en)
AU (1) AU687661B2 (en)
CA (1) CA2205926C (en)
DE (1) DE69600919T2 (en)
WO (1) WO1996023367A1 (en)

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US5995567A (en) * 1996-04-19 1999-11-30 Texas Instruments Incorporated Radio frequency noise canceller
DE69738288T2 (en) * 1996-05-31 2008-09-25 Koninklijke Philips Electronics N.V. DEVICE FOR SUPPRESSING A DISTURBING COMPONENT OF AN INPUT SIGNAL
KR100233463B1 (en) * 1997-03-07 1999-12-01 윤종용 Apparatus and method for noise cancellation
US6108412A (en) * 1997-10-07 2000-08-22 Nortel Networks Corporation Adaptive echo cancelling system for telephony applications
US6028929A (en) * 1997-11-14 2000-02-22 Tellabs Operations, Inc. Echo canceller employing dual-H architecture having improved non-linear echo path detection
US6240180B1 (en) * 1997-11-14 2001-05-29 Tellabs Operations, Inc. Echo canceller employing dual-H architecture having split adaptive gain settings
US6031908A (en) * 1997-11-14 2000-02-29 Tellabs Operations, Inc. Echo canceller employing dual-H architecture having variable adaptive gain settings
US6266409B1 (en) * 1997-11-14 2001-07-24 Tellabs Operations, Inc. Echo canceller employing dual-H architecture having improved double-talk detection
US6181793B1 (en) * 1997-11-14 2001-01-30 Tellabs Operations, Inc. Echo canceller employing dual-H architecture having improved coefficient transfer
US6304598B1 (en) 1998-08-28 2001-10-16 Broadcom Corporation Apparatus for, and method of, reducing power dissipation in a communications system
US6928106B1 (en) * 1998-08-28 2005-08-09 Broadcom Corporation Phy control module for a multi-pair gigabit transceiver
US6363129B1 (en) * 1998-11-09 2002-03-26 Broadcom Corporation Timing recovery system for a multi-pair gigabit transceiver
US6289047B1 (en) 1998-08-28 2001-09-11 Broadcom Corporation Dynamic regulation of power consumption of a high-speed communication system
US6807228B2 (en) 1998-11-13 2004-10-19 Broadcom Corporation Dynamic regulation of power consumption of a high-speed communication system
US6185263B1 (en) 1998-11-09 2001-02-06 Broadcom Corporation Adaptively configurable class-A/class-B transmit DAC for transceiver emission and power consumption control
AU1330200A (en) 1998-10-30 2000-05-22 Broadcom Corporation Internet gigabit ethernet transmitter architecture
US6925130B2 (en) * 1998-10-30 2005-08-02 Broadcom Corporation Method and system for a reduced emissions direct drive transmitter for unshielded twisted pair (UTP) applications
US6804304B1 (en) 1998-10-30 2004-10-12 Broadcom Corporation Reduction of aggregate EMI emissions of multiple transmitters
US6477200B1 (en) * 1998-11-09 2002-11-05 Broadcom Corporation Multi-pair gigabit ethernet transceiver
US6373908B2 (en) 1998-11-11 2002-04-16 Broadcom Corporation Adaptive electronic transmission signal cancellation apparatus for full duplex communication
US7423983B1 (en) * 1999-09-20 2008-09-09 Broadcom Corporation Voice and data exchange over a packet based network
US6823483B1 (en) * 1999-04-22 2004-11-23 Broadcom Corporation Physical coding sublayer for a multi-pair gigabit transceiver
AU4492100A (en) * 1999-04-22 2000-11-10 Broadcom Corporation Gigabit ethernet with timing offsets between the twisted pairs
WO2000072567A1 (en) 1999-05-25 2000-11-30 British Telecommunications Public Limited Company Acoustic echo cancellation
JP3640576B2 (en) 1999-09-07 2005-04-20 沖電気工業株式会社 Echo canceller and operation method thereof
US7164659B2 (en) * 1999-12-09 2007-01-16 Broadcom Corporation Adaptive gain control based on echo canceller performance information
US7920697B2 (en) * 1999-12-09 2011-04-05 Broadcom Corp. Interaction between echo canceller and packet voice processing
US6408021B1 (en) 2000-02-03 2002-06-18 Motorola, Inc. PCM modem adaptation system utilizing a silence period
GB2362063A (en) * 2000-04-25 2001-11-07 Mitel Corp Connecting broadband voice and data signals to telephone systems
US6775529B1 (en) 2000-07-31 2004-08-10 Marvell International Ltd. Active resistive summer for a transformer hybrid
US7312739B1 (en) * 2000-05-23 2007-12-25 Marvell International Ltd. Communication driver
US7433665B1 (en) 2000-07-31 2008-10-07 Marvell International Ltd. Apparatus and method for converting single-ended signals to a differential signal, and transceiver employing same
USRE41831E1 (en) 2000-05-23 2010-10-19 Marvell International Ltd. Class B driver
US7194037B1 (en) 2000-05-23 2007-03-20 Marvell International Ltd. Active replica transformer hybrid
US6931101B1 (en) * 2000-05-26 2005-08-16 Cisco Systems, Inc. Method and apparatus for inband testing of an echo canceller
US7606547B1 (en) 2000-07-31 2009-10-20 Marvell International Ltd. Active resistance summer for a transformer hybrid
US6687723B1 (en) * 2000-11-24 2004-02-03 Nortel Networks Limited Tri-mode adaptive filter and method
GB0402102D0 (en) 2004-01-30 2004-03-03 Mitel Networks Corp Method for detecting echo path changes in echo cancellers
GB2416971A (en) * 2004-08-04 2006-02-08 Mitel Networks Corp Calculating an expected echo return loss enhancement (erle) in an echo canceller
US7555117B2 (en) * 2005-07-12 2009-06-30 Acoustic Technologies, Inc. Path change detector for echo cancellation
US7312662B1 (en) 2005-08-09 2007-12-25 Marvell International Ltd. Cascode gain boosting system and method for a transmitter
US7577892B1 (en) 2005-08-25 2009-08-18 Marvell International Ltd High speed iterative decoder
JP4579301B2 (en) * 2006-01-17 2010-11-10 三菱電機株式会社 Echo canceller
US7729477B2 (en) * 2006-02-17 2010-06-01 At&T Intellectual Property I, L.P. System and method for detecting continuity of network lines
JP4411309B2 (en) * 2006-09-21 2010-02-10 Ｏｋｉセミコンダクタ株式会社 Double talk detection method
US20080159448A1 (en) * 2006-12-29 2008-07-03 Texas Instruments, Incorporated System and method for crosstalk cancellation
JP4600423B2 (en) * 2007-05-07 2010-12-15 パナソニック電工株式会社 Echo canceller
US20100304679A1 (en) * 2009-05-28 2010-12-02 Hanks Zeng Method and System For Echo Estimation and Cancellation
US9036815B2 (en) * 2012-06-02 2015-05-19 Yuan Ze University Method for acoustic echo cancellation and system thereof
EP3469591B1 (en) 2016-06-08 2020-04-08 Dolby Laboratories Licensing Corporation Echo estimation and management with adaptation of sparse prediction filter set
TWI763195B (en) 2020-12-18 2022-05-01 瑞昱半導體股份有限公司 Signal transceiving apparatus and method having echo-canceling mechanism

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US4360712A (en) * 1979-09-05 1982-11-23 Communications Satellite Corporation Double talk detector for echo cancellers
JPS58179035A (en) * 1982-04-15 1983-10-20 Toshiba Corp Modem
JPH0728244B2 (en) * 1988-09-28 1995-03-29 沖電気工業株式会社 Echo canceller
JPH02174353A (en) * 1988-12-27 1990-07-05 Fujitsu Ltd Echo canceller
JPH03262939A (en) * 1990-03-14 1991-11-22 Fujitsu Ltd Method and device for detecting echo path variation
NL9001016A (en) * 1990-04-27 1991-11-18 Philips Nv DIGITAL ECHO COMPENSATOR WITH A DOUBLE-VOICE DETECTOR.
US5157653A (en) * 1990-08-03 1992-10-20 Coherent Communications Systems Corp. Residual echo elimination with proportionate noise injection
US5153875A (en) * 1991-03-25 1992-10-06 Level One Communications, Inc. Adaptive balancing network
JPH05304493A (en) * 1992-04-24 1993-11-16 Toshiba Corp Echo canceler circuit
US5307405A (en) * 1992-09-25 1994-04-26 Qualcomm Incorporated Network echo canceller
JP2538176B2 (en) * 1993-05-28 1996-09-25 松下電器産業株式会社 Eco-control device
US5577097A (en) * 1994-04-14 1996-11-19 Northern Telecom Limited Determining echo return loss in echo cancelling arrangements

Also Published As

Publication number Publication date
WO1996023367A1 (en) 1996-08-01
AU687661B2 (en) 1998-02-26
DE69600919D1 (en) 1998-12-10
CA2205926C (en) 2001-04-10
JP3288383B2 (en) 2002-06-04
US5745564A (en) 1998-04-28
EP0806093A1 (en) 1997-11-12
JPH10502785A (en) 1998-03-10
AU4382396A (en) 1996-08-14
DE69600919T2 (en) 1999-04-01
EP0806093B1 (en) 1998-11-04

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