NO972151L - Ekko-kansellering av bruk av krysskorrelering av bufrede sendings- og mottakings-sampelsegmenter for å bestemme kansellerings-filterkoeffisienter - Google Patents

Ekko-kansellering av bruk av krysskorrelering av bufrede sendings- og mottakings-sampelsegmenter for å bestemme kansellerings-filterkoeffisienter

Info

Publication number
NO972151L
NO972151L NO972151A NO972151A NO972151L NO 972151 L NO972151 L NO 972151L NO 972151 A NO972151 A NO 972151A NO 972151 A NO972151 A NO 972151A NO 972151 L NO972151 L NO 972151L
Authority
NO
Norway
Prior art keywords
cross
correlation
filter coefficients
cancellation
echo cancellation
Prior art date
Application number
NO972151A
Other languages
English (en)
Other versions
NO972151D0 (no
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 NO972151D0 publication Critical patent/NO972151D0/no
Publication of NO972151L publication Critical patent/NO972151L/no

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

Abstract

Et ekkodeteksjonssystem omfatter datalageret (8, 18) for lagring av signaler fra henholdsvis oppadgående og nedadgående kanaler (5, 15). Signalene underkastes en forbehandling (9, 19) for å identifisere signal-former som er karakteristiske for tale, og for å instruere måleenheten (10) til å utføre sammenligning ved bruk av krysskorrelasjons-teknikker mellom de signaler som er lagret i lagrene (8, 18) bare når slike karakteristikker er detektert. Dette reduserer den nødvendige databehandlingskraft og øker nøyaktigheten av korrelasjonene. Parallelle behandlingsteknikker gjør det mulig å detektere ekko med lengre forsinkelsesperioder. Resultatene av målingene kan brukes til å generere et ekkokanselleringssignal (enhetene 7, 17).
NO972151A 1994-11-10 1997-05-09 Ekko-kansellering av bruk av krysskorrelering av bufrede sendings- og mottakings-sampelsegmenter for å bestemme kansellerings-filterkoeffisienter NO972151L (no)

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 (2)

Publication Number Publication Date
NO972151D0 NO972151D0 (no) 1997-05-09
NO972151L true NO972151L (no) 1997-05-09

Family

ID=26137377

Family Applications (1)

Application Number Title Priority Date Filing Date
NO972151A NO972151L (no) 1994-11-10 1997-05-09 Ekko-kansellering av bruk av krysskorrelering av bufrede sendings- og mottakings-sampelsegmenter for å bestemme kansellerings-filterkoeffisienter

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) NO972151L (no)
NZ (1) NZ295206A (no)
WO (1) WO1996015597A1 (no)

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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
CA2534767A1 (en) * 2003-08-05 2005-03-17 Inmate Telephone, Inc. Three-way call detection using steganography
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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
US20080201158A1 (en) 2007-02-15 2008-08-21 Johnson Mark D System and method for visitation management in a controlled-access environment
US8542802B2 (en) 2007-02-15 2013-09-24 Global Tel*Link Corporation System and method for three-way call detection
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
US9225838B2 (en) 2009-02-12 2015-12-29 Value-Added Communications, Inc. System and method for detecting three-way call circumvention attempts
US8630726B2 (en) * 2009-02-12 2014-01-14 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
JP6279172B2 (ja) * 2015-11-16 2018-02-14 三菱電機株式会社 エコーキャンセラ装置及び通話装置
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
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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
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Also Published As

Publication number Publication date
CN1086072C (zh) 2002-06-05
US6078567A (en) 2000-06-20
HK1002798A1 (en) 1998-09-18
DK0791251T3 (da) 1999-04-19
AU3849595A (en) 1996-06-06
NZ295206A (en) 1998-04-27
FI971984A (fi) 1997-05-09
ES2120240T3 (es) 1998-10-16
FI971984A0 (fi) 1997-05-09
EP0791251B1 (en) 1998-07-15
CA2202910A1 (en) 1996-05-23
DE69503518D1 (de) 1998-08-20
NO972151D0 (no) 1997-05-09
KR970707649A (ko) 1997-12-01
CA2202910C (en) 2001-09-25
CN1163026A (zh) 1997-10-22
IL115892A (en) 1999-05-09
IL115892A0 (en) 1996-01-31
DE69503518T2 (de) 1998-12-10
WO1996015597A1 (en) 1996-05-23
EP0791251A1 (en) 1997-08-27
MX9702958A (es) 1998-10-31
JPH10508992A (ja) 1998-09-02
AU691045B2 (en) 1998-05-07

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