FI853472L - Ekoavlaegsnare. - Google Patents

Ekoavlaegsnare.

Info

Publication number
FI853472L
FI853472L FI853472A FI853472A FI853472L FI 853472 L FI853472 L FI 853472L FI 853472 A FI853472 A FI 853472A FI 853472 A FI853472 A FI 853472A FI 853472 L FI853472 L FI 853472L
Authority
FI
Finland
Prior art keywords
ekoavlaegsnare
Prior art date
Application number
FI853472A
Other languages
English (en)
Finnish (fi)
Other versions
FI853472A0 (fi
Inventor
Graham Beniston
Nigel Paul Dyer
Andrew Jefford Thorneycr Wheen
Original Assignee
Plessey Overseas
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 Plessey Overseas filed Critical Plessey Overseas
Publication of FI853472A0 publication Critical patent/FI853472A0/fi
Publication of FI853472L publication Critical patent/FI853472L/fi

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
    • H04B3/237—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 two adaptive filters, e.g. for near end and for end echo cancelling
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Filters That Use Time-Delay Elements (AREA)
FI853472A 1984-09-12 1985-09-11 Ekoavlaegsnare. FI853472L (fi)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB848423017A GB8423017D0 (en) 1984-09-12 1984-09-12 Echo canceller

Publications (2)

Publication Number Publication Date
FI853472A0 FI853472A0 (fi) 1985-09-11
FI853472L true FI853472L (fi) 1986-03-13

Family

ID=10566604

Family Applications (1)

Application Number Title Priority Date Filing Date
FI853472A FI853472L (fi) 1984-09-12 1985-09-11 Ekoavlaegsnare.

Country Status (5)

Country Link
US (1) US4757527A (fr)
EP (1) EP0174749A1 (fr)
JP (1) JPS6171728A (fr)
FI (1) FI853472L (fr)
GB (2) GB8423017D0 (fr)

Families Citing this family (63)

* Cited by examiner, † Cited by third party
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US4697261A (en) * 1986-09-05 1987-09-29 M/A-Com Government Systems, Inc. Linear predictive echo canceller integrated with RELP vocoder
NL8701633A (nl) * 1987-07-10 1989-02-01 Philips Nv Digitale echocompensator.
US5014263A (en) * 1987-10-02 1991-05-07 Advanced Micro Devices, Inc. Adaptive echo-canceller with double-talker detection
GB2213686A (en) * 1987-12-09 1989-08-16 Racal Communications Equip Radio telephone terminal unit
US4922530A (en) * 1988-03-18 1990-05-01 Tellabs, Inc. Adaptive filter with coefficient averaging and method
FR2629293A1 (fr) * 1988-03-25 1989-09-29 Trt Telecom Radio Electr Annuleur d'echo pour signal d'echo a phase variable
US4879745A (en) * 1988-10-12 1989-11-07 Ibm Corporation Half-duplex speakerphone
US4912758A (en) * 1988-10-26 1990-03-27 International Business Machines Corporation Full-duplex digital speakerphone
JP2518394B2 (ja) * 1989-05-24 1996-07-24 日本電気株式会社 エコ―キャンセラ方式全二重送受信回路
US5033082A (en) * 1989-07-31 1991-07-16 Nelson Industries, Inc. Communication system with active noise cancellation
US5148488A (en) * 1989-11-17 1992-09-15 Nynex Corporation Method and filter for enhancing a noisy speech signal
US5305309A (en) * 1989-12-06 1994-04-19 Fujitsu Limited Echo canceller
DE59003360D1 (de) * 1990-03-27 1993-12-09 Siemens Ag Zweidraht-Vierdraht-Umsetzer.
JP2836277B2 (ja) * 1991-03-14 1998-12-14 国際電信電話株式会社 エコーキャンセル装置
US5153875A (en) * 1991-03-25 1992-10-06 Level One Communications, Inc. Adaptive balancing network
ES2038887B1 (es) * 1991-04-18 1995-05-01 Aplicaciones Electronicas Quas Hibrida digital para multiconferencia.
JP2794999B2 (ja) * 1991-08-14 1998-09-10 国際電信電話株式会社 エコーキャンセル方式
EP0601082A4 (en) * 1991-08-30 1996-05-15 Digital Sound Corp Adaptive echo canceller for voice messaging system.
JPH0669834A (ja) * 1992-08-24 1994-03-11 Mitsubishi Electric Corp ２線４線変換器
US5307405A (en) * 1992-09-25 1994-04-26 Qualcomm Incorporated Network echo canceller
US5754589A (en) * 1993-01-08 1998-05-19 Multi-Tech Systems, Inc. Noncompressed voice and data communication over modem for a computer-based multifunction personal communications system
US5864560A (en) * 1993-01-08 1999-01-26 Multi-Tech Systems, Inc. Method and apparatus for mode switching in a voice over data computer-based personal communications system
US5812534A (en) * 1993-01-08 1998-09-22 Multi-Tech Systems, Inc. Voice over data conferencing for a computer-based personal communications system
US7082106B2 (en) 1993-01-08 2006-07-25 Multi-Tech Systems, Inc. Computer-based multi-media communications system and method
US6009082A (en) * 1993-01-08 1999-12-28 Multi-Tech Systems, Inc. Computer-based multifunction personal communication system with caller ID
US5535204A (en) * 1993-01-08 1996-07-09 Multi-Tech Systems, Inc. Ringdown and ringback signalling for a computer-based multifunction personal communications system
US5546395A (en) * 1993-01-08 1996-08-13 Multi-Tech Systems, Inc. Dynamic selection of compression rate for a voice compression algorithm in a voice over data modem
US5452289A (en) * 1993-01-08 1995-09-19 Multi-Tech Systems, Inc. Computer-based multifunction personal communications system
US5617423A (en) * 1993-01-08 1997-04-01 Multi-Tech Systems, Inc. Voice over data modem with selectable voice compression
US5453986A (en) * 1993-01-08 1995-09-26 Multi-Tech Systems, Inc. Dual port interface for a computer-based multifunction personal communication system
SE501248C2 (sv) * 1993-05-14 1994-12-19 Ericsson Telefon Ab L M Metod och ekosläckare för ekoutsläckning med ett antal kaskadkopplade adaptiva filter
US5471527A (en) 1993-12-02 1995-11-28 Dsc Communications Corporation Voice enhancement system and method
DE69532394T2 (de) * 1994-02-10 2004-11-04 Nippon Telegraph And Telephone Corp. Verfahren und Vorrichtung zur Echokompensation mit Anwendung der "fast projection scheme"
US5682386A (en) * 1994-04-19 1997-10-28 Multi-Tech Systems, Inc. Data/voice/fax compression multiplexer
US5757801A (en) 1994-04-19 1998-05-26 Multi-Tech Systems, Inc. Advanced priority statistical multiplexer
US5515434A (en) * 1994-06-29 1996-05-07 Harris Corp Impedance setting circuit for a SLIC
US5535194A (en) * 1994-07-14 1996-07-09 Motorola, Inc. Method and apparatus for echo canceling with double-talk immunity
US6205216B1 (en) 1994-07-29 2001-03-20 British Telecommunications Public Limited Company Apparatus and method for inter-network communication
US6041118A (en) * 1994-12-22 2000-03-21 Lucent Technologies Inc. Architecture for telephone set
US5815496A (en) * 1995-09-29 1998-09-29 Lucent Technologies Inc. Cascade echo canceler arrangement
JP3199155B2 (ja) * 1995-10-18 2001-08-13 日本電信電話株式会社 反響消去装置
SE505150C3 (sv) 1995-10-18 1997-08-04 Ericsson Telefon Ab L M Adaptivt ekoslaeckningsfoerfarande av dubbelfiltertyp
SE517602C2 (sv) * 1995-10-20 2002-06-25 Ericsson Telefon Ab L M Fastlåst loop
US6111861A (en) * 1996-12-30 2000-08-29 Siemens Information And Communication Networks, Inc. Method and system for managing high speed data communication
US6185300B1 (en) 1996-12-31 2001-02-06 Ericsson Inc. Echo canceler for use in communications system
JP3097586B2 (ja) * 1997-03-06 2000-10-10 日本電気株式会社 信号検出器
FI104524B (fi) * 1997-04-18 2000-02-15 Nokia Mobile Phones Ltd Kaiunpoistojärjestelmä ja -menetelmä sekä matkaviestin
US6628780B2 (en) 1997-10-31 2003-09-30 Lucent Technologies Inc. Echo cancellation in the network for data 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
US6266409B1 (en) * 1997-11-14 2001-07-24 Tellabs Operations, Inc. Echo canceller employing dual-H architecture having improved double-talk detection
US6031908A (en) * 1997-11-14 2000-02-29 Tellabs Operations, Inc. Echo canceller employing dual-H architecture having variable adaptive gain settings
US6580696B1 (en) * 1999-03-15 2003-06-17 Cisco Systems, Inc. Multi-adaptation for a voice packet based
JP3566158B2 (ja) * 1999-12-07 2004-09-15 三菱電機株式会社 エコーキャンセラ装置
ATE248497T1 (de) * 1999-12-09 2003-09-15 Frederick Johannes Bruwer Sprachsverteilungssystem
US6438225B1 (en) * 2000-01-13 2002-08-20 Motorola, Inc. Method and system for detecting and controlling severe echo
US6351531B1 (en) 2000-01-21 2002-02-26 Motorola, Inc. Method and system for controlling echo cancellation using zero echo path, ringing, and off-hook detection
GB2362063A (en) 2000-04-25 2001-11-07 Mitel Corp Connecting broadband voice and data signals to telephone systems
EP1796281B1 (fr) * 2005-12-09 2015-08-12 Mitel Networks Corporation Annuleur d'écho
KR100995990B1 (ko) * 2007-12-07 2010-11-22 삼성전자주식회사 통신 시스템의 신호 송수신 장치에서 반향 신호 제거 장치 및 방법
CN102117620B (zh) * 2010-01-06 2012-08-29 杭州华三通信技术有限公司 一种双滤波器传递滤波器系数的方法及装置
CN103222192B (zh) * 2010-10-08 2019-05-07 日本电气株式会社 信号处理设备和信号处理方法
CN113676157B (zh) * 2021-08-11 2023-06-23 武汉理工大学 一种抵消直流偏置的自适应滤波算法

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1816153B2 (de) * 1968-12-20 1971-04-15 Schaltungsanordnung zur echounterdrueckung in einem sprech kreis auf einem vierdraht uebertragungssystem bei einem uebergang auf einen zweidrahtuebertragungsweg
CH554397A (de) * 1971-02-16 1974-09-30 Sandoz Ag Verfahren zur herstellung von azofarbstoffen.
US3787645A (en) * 1971-05-19 1974-01-22 Nippon Electric Co Echo canceller having two echo path models
FR2140258B1 (fr) * 1971-06-07 1974-08-23 Roussel Uclaf
JPS5631774B2 (fr) * 1971-08-13 1981-07-23
JPS51144111A (en) * 1975-06-05 1976-12-10 Kokusai Denshin Denwa Co Ltd <Kdd> Echo cancelling method
US4268727A (en) * 1979-03-14 1981-05-19 International Telephone And Telegraph Corporation Adaptive digital echo cancellation circuit
AU532416B2 (en) * 1979-09-19 1983-09-29 Plessey Overseas Ltd. Transversal equalisers
JPS5792927A (en) * 1980-11-29 1982-06-09 Toshiba Corp Echo cancelling device
SE8205841L (sv) * 1981-10-23 1983-04-24 Western Electric Co Ekoeliminator

Also Published As

Publication number Publication date
EP0174749A1 (fr) 1986-03-19
GB2164529A (en) 1986-03-19
GB2164529B (en) 1988-12-29
FI853472A0 (fi) 1985-09-11
US4757527A (en) 1988-07-12
JPS6171728A (ja) 1986-04-12
GB8520519D0 (en) 1985-09-18
GB8423017D0 (en) 1984-10-17

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Legal Events

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FD Application lapsed

Owner name: PLESSEY OVERSEAS LIMITED