ATE235763T1 - Verfahren zur echokompensation und echopfadschätzung - Google Patents

Verfahren zur echokompensation und echopfadschätzung

Info

Publication number
ATE235763T1
ATE235763T1 AT95917504T AT95917504T ATE235763T1 AT E235763 T1 ATE235763 T1 AT E235763T1 AT 95917504 T AT95917504 T AT 95917504T AT 95917504 T AT95917504 T AT 95917504T AT E235763 T1 ATE235763 T1 AT E235763T1
Authority
AT
Austria
Prior art keywords
echo
path estimation
sampler
compensation
sampling rate
Prior art date
Application number
AT95917504T
Other languages
English (en)
Inventor
Toshiro Kawahara
Toshio H Miki
Hirohito Suda
Tomoyuki Ohya
Hirofumi Takagi
Original Assignee
Nippon Telegraph & Telephone
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 JP11764094A external-priority patent/JPH07303067A/ja
Priority claimed from JP11759294A external-priority patent/JPH07303064A/ja
Priority claimed from JP11758994A external-priority patent/JPH07303061A/ja
Priority claimed from JP6117590A external-priority patent/JPH07303062A/ja
Priority claimed from JP11759394A external-priority patent/JP3212796B2/ja
Application filed by Nippon Telegraph & Telephone filed Critical Nippon Telegraph & Telephone
Application granted granted Critical
Publication of ATE235763T1 publication Critical patent/ATE235763T1/de

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • 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
    • H04B3/238—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 initial training sequence
    • 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)
  • Telephone Function (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
AT95917504T 1994-05-06 1995-05-02 Verfahren zur echokompensation und echopfadschätzung ATE235763T1 (de)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP11764094A JPH07303067A (ja) 1994-05-06 1994-05-06 エコーキャンセラ
JP11759294A JPH07303064A (ja) 1994-05-07 1994-05-07 エコーキャンセラ
JP11758994A JPH07303061A (ja) 1994-05-07 1994-05-07 エコーキャンセラおよびエコーパス推定方法
JP6117590A JPH07303062A (ja) 1994-05-07 1994-05-07 エコーキャンセラおよびエコーパス推定方法
JP11759394A JP3212796B2 (ja) 1994-05-07 1994-05-07 エコーキャンセラ
PCT/JP1995/000866 WO1995031052A1 (fr) 1994-05-06 1995-05-02 Compensateur d'echos et procede d'estimation de la trajectoire de l'echo

Publications (1)

Publication Number Publication Date
ATE235763T1 true ATE235763T1 (de) 2003-04-15

Family

ID=27526770

Family Applications (1)

Application Number Title Priority Date Filing Date
AT95917504T ATE235763T1 (de) 1994-05-06 1995-05-02 Verfahren zur echokompensation und echopfadschätzung

Country Status (8)

Country Link
US (1) US5859907A (de)
EP (3) EP1202469B1 (de)
KR (1) KR100233077B1 (de)
CN (3) CN1084976C (de)
AT (1) ATE235763T1 (de)
CA (1) CA2162570C (de)
DE (3) DE69530040T2 (de)
WO (1) WO1995031052A1 (de)

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KR100212577B1 (ko) * 1997-02-25 1999-08-02 윤종용 음성사서함시스템에서 반향제거를 위한 백색잡음 송출 방법
US7136471B2 (en) * 1997-03-27 2006-11-14 T-Netix, Inc. Method and apparatus for detecting a secondary destination of a telephone call based on changes in the telephone signal path
US6141406A (en) * 1997-03-27 2000-10-31 T-Netix, Inc. Method and apparatus for detecting a secondary destination of a telephone call based on changes in the telephone signal path
JP3396393B2 (ja) * 1997-04-30 2003-04-14 沖電気工業株式会社 エコー・雑音成分除去装置
JP3710606B2 (ja) 1997-09-04 2005-10-26 松下電器産業株式会社 エコーキャンセラ
US6549627B1 (en) * 1998-01-30 2003-04-15 Telefonaktiebolaget Lm Ericsson Generating calibration signals for an adaptive beamformer
US6317419B1 (en) * 1998-06-10 2001-11-13 Conexant Systems, Inc. Method and apparatus for training an echo canceler in a PCM modem context
US6324170B1 (en) * 1998-09-10 2001-11-27 Nortel Networks Limited Echo controller with compensation for variable delay networks
JP2000252881A (ja) * 1999-02-25 2000-09-14 Mitsubishi Electric Corp ダブルトーク検知装置並びにエコーキャンセラ装置およびエコーサプレッサー装置
US6707912B2 (en) * 1999-03-11 2004-03-16 Motorola, Inc. Method and apparatus for setting a step size for an adaptive filter coefficient of an echo canceller
US6560332B1 (en) * 1999-05-18 2003-05-06 Telefonaktiebolaget Lm Ericsson (Publ) Methods and apparatus for improving echo suppression in bi-directional communications systems
US7062039B1 (en) * 1999-05-27 2006-06-13 Telefonaktiebolaget Lm Ericsson Methods and apparatus for improving adaptive filter performance by inclusion of inaudible information
US6763099B1 (en) * 1999-11-05 2004-07-13 T-Netix, Inc. Advanced three way call detection system and method using spread spectrum techniques
US20150117441A1 (en) * 2013-10-28 2015-04-30 Michael Pascazi System and method for cell phone to cell phone signal transmission via the internet
US6804204B2 (en) * 2000-12-08 2004-10-12 Topic Semiconductor Corp. Apparatus for a digital echo canceller and method therefor
KR100399902B1 (ko) * 2001-05-02 2003-09-29 주식회사 하이닉스반도체 고속 유선 통신용 액티브 하이브리드 회로
US20020172350A1 (en) * 2001-05-15 2002-11-21 Edwards Brent W. Method for generating a final signal from a near-end signal and a far-end signal
US7899167B1 (en) 2003-08-15 2011-03-01 Securus Technologies, Inc. Centralized call processing
US8000269B1 (en) 2001-07-13 2011-08-16 Securus Technologies, Inc. Call processing with voice over internet protocol transmission
SE525053C2 (sv) * 2002-04-26 2004-11-16 Global Ip Sound Europ Ab Ekosläckning
US9026468B2 (en) 2002-04-29 2015-05-05 Securus Technologies, Inc. System and method for proactively establishing a third-party payment account for services rendered to a resident of a controlled-environment facility
US7860222B1 (en) 2003-11-24 2010-12-28 Securus Technologies, Inc. Systems and methods for acquiring, accessing, and analyzing investigative information
US7916845B2 (en) * 2006-04-13 2011-03-29 Securus Technologies, Inc. Unauthorized call activity detection and prevention systems and methods for a Voice over Internet Protocol environment
US9020114B2 (en) 2002-04-29 2015-04-28 Securus Technologies, Inc. Systems and methods for detecting a call anomaly using biometric identification
KR20030091362A (ko) * 2002-05-27 2003-12-03 엘지전자 주식회사 선로 반향 제거 장치
KR100502414B1 (ko) * 2002-11-22 2005-07-19 삼성전자주식회사 에이디에스엘 시스템의 에코 제거기 및 그것의 트레이닝방법
US7529357B1 (en) 2003-08-15 2009-05-05 Evercom Systems, Inc. Inmate management and call processing systems and methods
JP4613705B2 (ja) * 2005-06-15 2011-01-19 沖電気工業株式会社 エコーキャンセラ
US10796392B1 (en) 2007-05-22 2020-10-06 Securus Technologies, Llc Systems and methods for facilitating booking, bonding and release
JP5092580B2 (ja) 2007-06-26 2012-12-05 ソニー株式会社 デジタル信号処理装置、デジタル信号処理方法及びデジタル信号処理プログラム
CN101350798B (zh) * 2008-08-29 2010-06-16 北京创毅视讯科技有限公司 回波消除装置和方法、及包含回波消除装置的收发设备
US8605890B2 (en) * 2008-09-22 2013-12-10 Microsoft Corporation Multichannel acoustic echo cancellation
JP6155882B2 (ja) * 2013-06-17 2017-07-05 沖電気工業株式会社 エコー抑圧装置及びプログラム
CN104270538B (zh) * 2014-08-22 2016-05-25 北京电子科技学院 双变压器回波补偿数字电话密码机
KR102076760B1 (ko) * 2018-09-19 2020-02-12 한양대학교 산학협력단 다채널 마이크를 이용한 칼만필터 기반의 다채널 입출력 비선형 음향학적 반향 제거 방법

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JPS5890832A (ja) * 1981-11-26 1983-05-30 Toshiba Corp 反響打消し装置
FR2528643A1 (fr) * 1982-06-14 1983-12-16 Trt Telecom Radio Electr Procede destine a reduire le temps de convergence d'un annuleur d'echo et dispositif utilise pour mettre en oeuvre ce procede
US4582963A (en) * 1982-07-29 1986-04-15 Rockwell International Corporation Echo cancelling using adaptive bulk delay and filter
US4562312A (en) * 1983-02-17 1985-12-31 At&T Bell Laboratories Subsampling delay estimator for an echo canceler
FR2541837A1 (fr) * 1983-02-25 1984-08-31 Trt Telecom Radio Electr Procede de reduction du temps de convergence d'un annuleur d'echo et dispositif pour mettre en oeuvre ce procede
AU4695485A (en) * 1984-09-21 1986-03-27 Alcatel N.V. Digital hybrid
JPS61184934A (ja) * 1985-02-12 1986-08-18 Nippon Telegr & Teleph Corp <Ntt> デイジタル加入者線双方向伝送装置
JPS6232727A (ja) * 1985-08-05 1987-02-12 Fujitsu Ltd エコ−キヤンセラ装置
JPH0638589B2 (ja) * 1985-10-25 1994-05-18 日本電信電話株式会社 エコ−キヤンセラ
EP0221221B1 (de) * 1985-10-30 1991-12-27 International Business Machines Corporation Verfahren zur Bestimmung einer flachen Echopfadverzögerung und dieses Verfahren verwendender Echokompensator
JPS62116025A (ja) * 1985-11-15 1987-05-27 Nippon Telegr & Teleph Corp <Ntt> 音響エコー消去装置
JP2842607B2 (ja) * 1989-03-13 1999-01-06 株式会社日立製作所 エコーキャンセラ、それを備えた通信装置および信号処理方法
US4987569A (en) * 1989-04-05 1991-01-22 Codex Corporation Fast training echo canceller
EP0403716B1 (de) * 1989-06-22 1995-09-13 International Business Machines Corporation Echokompensationseinrichtung mit Anpassung der Echokompensationskoeffizienten während der Vollduplexübertragung
JPH0344218A (ja) * 1989-07-12 1991-02-26 Fujitsu Ltd 適応形エコーキャンセラ
US5305309A (en) * 1989-12-06 1994-04-19 Fujitsu Limited Echo canceller
JPH0465922A (ja) * 1990-07-02 1992-03-02 Fujitsu Ltd エコーキャンセラー
JP2520770B2 (ja) * 1990-07-06 1996-07-31 富士通株式会社 ハイブリッド回路
CA2060250A1 (en) * 1991-02-04 1992-08-05 John M. Cioffi Method and apparatus for echo cancellation of a multicarrier signal
JPH06232957A (ja) * 1993-01-29 1994-08-19 Toshiba Corp 音声通信装置
US5327496A (en) * 1993-06-30 1994-07-05 Iowa State University Research Foundation, Inc. Communication device, apparatus, and method utilizing pseudonoise signal for acoustical echo cancellation
JP2702423B2 (ja) * 1994-11-11 1998-01-21 埼玉日本電気株式会社 切替式エコーキャンセラ

Also Published As

Publication number Publication date
CN1404232A (zh) 2003-03-19
CN1128591A (zh) 1996-08-07
US5859907A (en) 1999-01-12
CN1396718A (zh) 2003-02-12
DE69533375T2 (de) 2005-07-28
CN1232048C (zh) 2005-12-14
DE69533375D1 (de) 2004-09-16
EP1202469A3 (de) 2003-04-02
CA2162570C (en) 2001-04-10
EP0708537A1 (de) 1996-04-24
DE69530040D1 (de) 2003-04-30
CA2162570A1 (en) 1995-11-16
EP1184998B1 (de) 2006-07-19
KR100233077B1 (ko) 1999-12-01
KR960702965A (ko) 1996-05-23
EP1184998A9 (de) 2003-12-17
DE69530040T2 (de) 2004-02-12
EP1202469B1 (de) 2004-08-11
CN1185800C (zh) 2005-01-19
DE69535116T2 (de) 2007-02-15
EP0708537B1 (de) 2003-03-26
EP1202469A2 (de) 2002-05-02
CN1084976C (zh) 2002-05-15
WO1995031052A1 (fr) 1995-11-16
EP0708537A4 (de) 1997-08-06
DE69535116D1 (de) 2006-08-31
EP1184998A3 (de) 2003-08-13
EP1184998A2 (de) 2002-03-06

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Legal Events

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RER Ceased as to paragraph 5 lit. 3 law introducing patent treaties