HK1002798A1 - Echo cancellation using cross-correlation of buffered receive and transmit sample segments to determine cancelling filter coefficients - Google Patents

Echo cancellation using cross-correlation of buffered receive and transmit sample segments to determine cancelling filter coefficients

Info

Publication number
HK1002798A1
HK1002798A1 HK98101429A HK98101429A HK1002798A1 HK 1002798 A1 HK1002798 A1 HK 1002798A1 HK 98101429 A HK98101429 A HK 98101429A HK 98101429 A HK98101429 A HK 98101429A HK 1002798 A1 HK1002798 A1 HK 1002798A1
Authority
HK
Hong Kong
Prior art keywords
correlation
cross
filter coefficients
echo cancellation
sample segments
Prior art date
Application number
HK98101429A
Other languages
English (en)
Inventor
Douglas Mackay Traill
Philip Julian Sheppard
Jianxiong Bai
Simon Milner
Original Assignee
British Telecomm
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 British Telecomm filed Critical British Telecomm
Publication of HK1002798A1 publication Critical patent/HK1002798A1/xx

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Time-Division Multiplex Systems (AREA)
HK98101429A 1994-11-10 1998-02-24 Echo cancellation using cross-correlation of buffered receive and transmit sample segments to determine cancelling filter coefficients HK1002798A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP94308290 1994-11-10
EP94308291 1994-11-10
PCT/GB1995/002618 WO1996015597A1 (en) 1994-11-10 1995-11-07 Echo cancellation using cross-correlation of buffered receive and transmit sample segments to determine cancelling filter coefficients

Publications (1)

Publication Number Publication Date
HK1002798A1 true HK1002798A1 (en) 1998-09-18

Family

ID=26137377

Family Applications (1)

Application Number Title Priority Date Filing Date
HK98101429A HK1002798A1 (en) 1994-11-10 1998-02-24 Echo cancellation using cross-correlation of buffered receive and transmit sample segments to determine cancelling filter coefficients

Country Status (15)

Country Link
US (1) US6078567A (no)
EP (1) EP0791251B1 (no)
JP (1) JPH10508992A (no)
KR (1) KR970707649A (no)
CN (1) CN1086072C (no)
CA (1) CA2202910C (no)
DE (1) DE69503518T2 (no)
DK (1) DK0791251T3 (no)
ES (1) ES2120240T3 (no)
FI (1) FI971984A0 (no)
HK (1) HK1002798A1 (no)
IL (1) IL115892A (no)
NO (1) NO972151D0 (no)
NZ (1) NZ295206A (no)
WO (1) WO1996015597A1 (no)

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US6304619B1 (en) * 1998-07-01 2001-10-16 Zenith Electronics Corporation Receiver synchronizer
US6934387B1 (en) 1999-12-17 2005-08-23 Marvell International Ltd. Method and apparatus for digital near-end echo/near-end crosstalk cancellation with adaptive correlation
EP1117191A1 (en) * 2000-01-13 2001-07-18 Telefonaktiebolaget Lm Ericsson Echo cancelling method
US7139342B1 (en) * 2000-05-12 2006-11-21 National Semiconductor Corporation System and method for cancelling signal echoes in a full-duplex transceiver front end
DE10129919A1 (de) * 2001-06-21 2003-01-16 Harman Becker Automotive Sys Verfahren und Vorrichtung zum Erkennen von Sendern mit gleichem Programminhalt
US6895086B2 (en) * 2001-11-13 2005-05-17 Inmate Telephone, Inc. 3-Way call detection system and method
US6928160B2 (en) * 2002-08-09 2005-08-09 Acoustic Technology, Inc. Estimating bulk delay in a telephone system
US7251213B2 (en) * 2002-09-17 2007-07-31 At&T Corp. Method for remote measurement of echo path delay
DE10305077A1 (de) * 2003-02-07 2004-08-26 Infineon Technologies Ag Verfahren und Vorrichtung zur Echokompensation
CN100379210C (zh) * 2003-06-08 2008-04-02 华为技术有限公司 通信系统回波特性的在线测试方法及测试系统
US20040252652A1 (en) * 2003-06-10 2004-12-16 Alexander Berestesky Cross correlation, bulk delay estimation, and echo cancellation
EP1661371A4 (en) * 2003-08-05 2009-05-06 Inmate Telephone Inc THREE TELEPHONE CONFERENCE DETECTION USING STEGANOGRAPHY
GB0407386D0 (en) * 2004-03-31 2004-05-05 British Telecomm Monitoring a communications link
US20070253561A1 (en) * 2006-04-27 2007-11-01 Tsp Systems, Inc. Systems and methods for audio enhancement
US7516033B2 (en) * 2006-06-23 2009-04-07 At&T Intellectual Property I, L.P. Method and apparatus for identifying echo sources in a communication path
US8542802B2 (en) 2007-02-15 2013-09-24 Global Tel*Link Corporation System and method for three-way call detection
US20080201158A1 (en) 2007-02-15 2008-08-21 Johnson Mark D System and method for visitation management in a controlled-access environment
CN101163178B (zh) * 2007-11-01 2011-05-11 中兴通讯股份有限公司 一种无线通信系统中回声抵消方法及其系统
JP4621266B2 (ja) * 2008-03-25 2011-01-26 富士通株式会社 測定方法、エコー発生箇所特定方法、測定装置、およびエコー発生箇所特定装置
US7839758B1 (en) * 2008-09-23 2010-11-23 Net Logic Microsystems, Inc. Analog echo canceller with interpolating output
US8630726B2 (en) * 2009-02-12 2014-01-14 Value-Added Communications, Inc. System and method for detecting three-way call circumvention attempts
US9225838B2 (en) 2009-02-12 2015-12-29 Value-Added Communications, Inc. System and method for detecting three-way call circumvention attempts
US8687797B2 (en) * 2009-05-28 2014-04-01 Broadcom Corporation Method and system for a dual echo canceller
CN102075463B (zh) * 2010-12-01 2013-10-02 福建京奥通信技术有限公司 一种基于互相关和lms的干扰迭代消除系统及其方法
CN102694562B (zh) * 2011-05-17 2014-08-20 杭州畅鼎科技有限公司 利用改进的变步长nlms算法的自适应干扰消除的方法
US9135577B2 (en) 2012-10-10 2015-09-15 International Business Machines Corporation Statistical determination of power-circuit connectivity
US10009101B2 (en) 2015-03-17 2018-06-26 The Boeing Company Laser communications following an atmospheric event
US10313010B2 (en) * 2015-03-17 2019-06-04 The Boeing Company Laser communications in super-geosynchronous earth orbit
CN105280195B (zh) 2015-11-04 2018-12-28 腾讯科技（深圳）有限公司 语音信号的处理方法及装置
DE112015007019B4 (de) * 2015-11-16 2019-07-25 Mitsubishi Electric Corporation Echolöscheinrichtung und Sprachtelekommunikationseinrichtung
US10572961B2 (en) 2016-03-15 2020-02-25 Global Tel*Link Corporation Detection and prevention of inmate to inmate message relay
US9609121B1 (en) 2016-04-07 2017-03-28 Global Tel*Link Corporation System and method for third party monitoring of voice and video calls
US10027797B1 (en) 2017-05-10 2018-07-17 Global Tel*Link Corporation Alarm control for inmate call monitoring
US10225396B2 (en) 2017-05-18 2019-03-05 Global Tel*Link Corporation Third party monitoring of a activity within a monitoring platform
US10860786B2 (en) 2017-06-01 2020-12-08 Global Tel*Link Corporation System and method for analyzing and investigating communication data from a controlled environment
US9930088B1 (en) 2017-06-22 2018-03-27 Global Tel*Link Corporation Utilizing VoIP codec negotiation during a controlled environment call

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US4561067A (en) * 1982-06-23 1985-12-24 British Telecommunications Multi-channel cross-talk interference reduction circuit using modulation-multiplying-demodulation correlator
FR2540314A1 (fr) * 1983-01-31 1984-08-03 Trt Telecom Radio Electr Procede d'initialisation des coefficients de filtres dans un dispositif d'annulation d'echos proche et lointain et dispositif de mise en oeuvre de ce procede
US5103459B1 (en) * 1990-06-25 1999-07-06 Qualcomm Inc System and method for generating signal waveforms in a cdma cellular telephone system
EP0601082A4 (en) * 1991-08-30 1996-05-15 Digital Sound Corp Adaptive echo canceller for voice messaging system.
US5222251A (en) * 1992-04-27 1993-06-22 Motorola, Inc. Method for eliminating acoustic echo in a communication device
JP2508574B2 (ja) * 1992-11-10 1996-06-19 日本電気株式会社 多チャンネルエコ―除去装置
FI935834A (fi) * 1993-12-23 1995-06-24 Nokia Telecommunications Oy Menetelmä kaikukohtaan sovittautumiseksi kaiunpoistajassa
US5577097A (en) * 1994-04-14 1996-11-19 Northern Telecom Limited Determining echo return loss in echo cancelling arrangements
JPH08125591A (ja) * 1994-10-20 1996-05-17 Fujitsu Ltd エコーキャンセラシステム

Also Published As

Publication number Publication date
EP0791251A1 (en) 1997-08-27
IL115892A0 (en) 1996-01-31
FI971984A (fi) 1997-05-09
FI971984A0 (fi) 1997-05-09
MX9702958A (es) 1998-10-31
WO1996015597A1 (en) 1996-05-23
ES2120240T3 (es) 1998-10-16
AU3849595A (en) 1996-06-06
NZ295206A (en) 1998-04-27
NO972151L (no) 1997-05-09
EP0791251B1 (en) 1998-07-15
US6078567A (en) 2000-06-20
DE69503518D1 (de) 1998-08-20
DK0791251T3 (da) 1999-04-19
CA2202910A1 (en) 1996-05-23
AU691045B2 (en) 1998-05-07
CN1163026A (zh) 1997-10-22
DE69503518T2 (de) 1998-12-10
JPH10508992A (ja) 1998-09-02
NO972151D0 (no) 1997-05-09
IL115892A (en) 1999-05-09
KR970707649A (ko) 1997-12-01
CA2202910C (en) 2001-09-25
CN1086072C (zh) 2002-06-05

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Legal Events

Date Code Title Description
PC Patent ceased (i.e. patent has lapsed due to the failure to pay the renewal fee)

Effective date: 20031107

PC Patent ceased (i.e. patent has lapsed due to the failure to pay the renewal fee)