HK1000482A1 - Echo canceller - Google Patents

Echo canceller

Info

Publication number
HK1000482A1
HK1000482A1 HK97102050A HK97102050A HK1000482A1 HK 1000482 A1 HK1000482 A1 HK 1000482A1 HK 97102050 A HK97102050 A HK 97102050A HK 97102050 A HK97102050 A HK 97102050A HK 1000482 A1 HK1000482 A1 HK 1000482A1
Authority
HK
Hong Kong
Prior art keywords
echo
training
signal
sequence
modem
Prior art date
Application number
HK97102050A
Other languages
English (en)
Inventor
Ling Fuyun
Long Guozhu
Original Assignee
Codex Corp
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 Codex Corp filed Critical Codex Corp
Publication of HK1000482A1 publication Critical patent/HK1000482A1/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
    • 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
    • H04B3/238—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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Primary Cells (AREA)
  • Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
  • Networks Using Active Elements (AREA)
  • Complex Calculations (AREA)
HK97102050A 1989-04-05 1997-10-29 Echo canceller HK1000482A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US07/333,992 US4987569A (en) 1989-04-05 1989-04-05 Fast training echo canceller

Publications (1)

Publication Number Publication Date
HK1000482A1 true HK1000482A1 (en) 1998-03-27

Family

ID=23305091

Family Applications (1)

Application Number Title Priority Date Filing Date
HK97102050A HK1000482A1 (en) 1989-04-05 1997-10-29 Echo canceller

Country Status (7)

Country Link
US (1) US4987569A (xx)
EP (3) EP0391715B1 (xx)
JP (1) JPH02288622A (xx)
AT (1) ATE131675T1 (xx)
CA (1) CA2013797C (xx)
DE (3) DE69033576T2 (xx)
HK (1) HK1000482A1 (xx)

Families Citing this family (48)

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JPH02280422A (ja) * 1989-04-20 1990-11-16 Nec Corp 音声会議装置用エコーキャンセラのトレーニング方法
DE68924261T2 (de) * 1989-06-22 1996-03-21 Ibm Echokompensationseinrichtung mit Anpassung der Echokompensationskoeffizienten während der Vollduplexübertragung.
JP3158414B2 (ja) * 1990-06-25 2001-04-23 日本電気株式会社 エコーキャンセラ
US5500875A (en) * 1990-12-12 1996-03-19 Signal Processing Associates Pty Limited QAM encoding
US5189664A (en) * 1991-02-19 1993-02-23 Silicon Systems, Inc. Listener echo cancellation
US5153875A (en) * 1991-03-25 1992-10-06 Level One Communications, Inc. Adaptive balancing network
US5214637A (en) * 1991-04-15 1993-05-25 Codex Corporation High speed two wire modem
JP3013613B2 (ja) * 1992-06-29 2000-02-28 ヤマハ株式会社 データ送受信装置
US5546459A (en) * 1993-11-01 1996-08-13 Qualcomm Incorporated Variable block size adaptation algorithm for noise-robust acoustic echo cancellation
WO1995031052A1 (fr) * 1994-05-06 1995-11-16 Ntt Mobile Communications Network Inc. Compensateur d'echos et procede d'estimation de la trajectoire de l'echo
WO1995031051A1 (fr) * 1994-05-07 1995-11-16 Ntt Mobile Communications Network Inc. Compensateur d'echo et son procede d'apprentissage
FI97836C (fi) * 1994-10-31 1997-02-25 Nokia Telecommunications Oy Menetelmä tietoliikenneyhteyden muodostamiseksi
US5761638A (en) * 1995-03-17 1998-06-02 Us West Inc Telephone network apparatus and method using echo delay and attenuation
US5757849A (en) * 1995-03-30 1998-05-26 Lucent Technologies Inc. Timing recovery in a network-synchronized modem
US5790594A (en) * 1995-07-28 1998-08-04 Motorola, Inc. High speed modem and method for expedited timing recovery
US5675644A (en) * 1995-09-26 1997-10-07 Qualcomm Incorporated Method and apparatus for canceling echo accounting for delay variations
US5812537A (en) * 1995-09-29 1998-09-22 Paradyne Corporation Echo canceling method and apparatus for data over cellular
US5828657A (en) * 1995-09-29 1998-10-27 Paradyne Corporation Half-duplex echo canceler training using a pilot signal
US5870429A (en) * 1996-06-17 1999-02-09 Motorola, Inc. Apparatus method, and software modem for utilizing envelope delay distortion characteristics to determine a symbol rate and a carrier frequency for data transfer
US6111949A (en) * 1996-09-04 2000-08-29 Teltrend, Inc. Method of rapid automatic hybrid balancing
US5974137A (en) * 1996-09-04 1999-10-26 Teltrend, Inc. AGC amplifier for two-wire line conditioner
US5963638A (en) 1996-09-04 1999-10-05 Teltrend, Inc. Adjustable hybrid having improved biasing configuration
US5953412A (en) * 1996-09-04 1999-09-14 Teltrend, Inc. Method and apparatus for controlling line conditioner equalizer
US5790658A (en) * 1996-10-28 1998-08-04 Advanced Micro Devices, Inc. High performance echo canceller for high speed modem
US6078645A (en) * 1997-02-20 2000-06-20 Lucent Technologies Inc. Apparatus and method for monitoring full duplex data communications
US5909426A (en) * 1997-03-31 1999-06-01 Rockwell Science Center, Inc. Orthogonal LMS algorithms for fast line echo canceler training
US6181791B1 (en) * 1998-01-06 2001-01-30 Stmicroelectronics, Inc. Apparatus and method for reducing local interference in subscriber loop communication system
US6317419B1 (en) * 1998-06-10 2001-11-13 Conexant Systems, Inc. Method and apparatus for training an echo canceler in a PCM modem context
US6978015B1 (en) 1999-11-11 2005-12-20 Tokyo Electron Limited Method and apparatus for cooperative diagnosis of impairments and mitigation of disturbers in communication systems
US6834109B1 (en) * 1999-11-11 2004-12-21 Tokyo Electron Limited Method and apparatus for mitigation of disturbers in communication systems
US6870901B1 (en) 1999-11-11 2005-03-22 Tokyo Electron Limited Design and architecture of an impairment diagnosis system for use in communications systems
US7864692B1 (en) 1999-11-11 2011-01-04 Tokyo Electron Limited Method and apparatus for the prediction and optimization in impaired communication systems
US6970560B1 (en) 1999-11-11 2005-11-29 Tokyo Electron Limited Method and apparatus for impairment diagnosis in communication systems
US6970415B1 (en) 1999-11-11 2005-11-29 Tokyo Electron Limited Method and apparatus for characterization of disturbers in communication systems
US7369516B1 (en) * 2000-02-21 2008-05-06 Abraham Fisher Adaptive echo canceling
US7672447B1 (en) 2000-06-01 2010-03-02 Telefonaktiebolaget Lm Ericsson (Publ) Frequency domain echo canceller
US7593511B2 (en) * 2001-11-19 2009-09-22 Alcatel Lucent Method for training line drivers in a communication system
US7046798B2 (en) * 2002-09-03 2006-05-16 Paradyne Corporation System and method for subliminal time domain duplexing
KR100467026B1 (ko) * 2002-12-20 2005-01-24 삼성전자주식회사 하드웨어의 구성을 단순화시킨 에코 제거기를 갖는 비대칭통신 시스템과 에코 제거기의 필터 계수를 다운 로드하는방법
KR101060585B1 (ko) * 2003-07-19 2011-08-31 주식회사 쏠리테크 반향 제거 장치를 갖는 무선 중계기 및 반향 신호 제거 방법
US20050195892A1 (en) * 2004-03-05 2005-09-08 Texas Instruments Incorporated Training and updating for multiple input-output wireline communications
US7619964B2 (en) * 2004-07-08 2009-11-17 Nokia Corporation High doppler channel estimation for OFD multiple antenna systems
US8565416B2 (en) * 2006-03-17 2013-10-22 Cisco Technology, Inc. Cache-based echo canceller
US8126161B2 (en) * 2006-11-02 2012-02-28 Hitachi, Ltd. Acoustic echo canceller system
US8396206B2 (en) * 2007-02-15 2013-03-12 Infineon Technologies Ag Multi-channel communication device and methods for reducing echoes by inserting a training sequence under a spectral mask
US8213597B2 (en) * 2007-02-15 2012-07-03 Infineon Technologies Ag Audio communication device and methods for reducing echoes by inserting a training sequence under a spectral mask
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
US8135058B2 (en) * 2008-10-10 2012-03-13 Csr Technology Inc. Adaptive known signal canceller

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4126770A (en) * 1975-11-07 1978-11-21 Kokusai Denshin Denwa Kabushiki Kaisha Echo canceller
FR2337465A1 (fr) * 1975-12-30 1977-07-29 Ibm France Procede et dispositif pour determiner les valeurs initiales des coefficients d'un egaliseur transversal complexe
USRE31253E (en) * 1976-09-07 1983-05-24 Bell Telephone Laboratories, Incorporated Echo cancellation in two-wire, two-way data transmission systems
EP0270706B1 (fr) * 1982-06-14 1993-03-24 Telecommunications Radioelectriques Et Telephoniques T.R.T. Procédé destiné à réduire le temps de convergence d'un annuleur d'écho
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
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
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
US4594479A (en) * 1983-08-18 1986-06-10 At&T Information Systems Inc. Bell Telephone Laboratories, Inc. Fast start-up of adaptive echo canceler or echo measurement device
US4682358A (en) * 1984-12-04 1987-07-21 American Telephone And Telegraph Company Echo canceller
US4760596A (en) * 1986-02-25 1988-07-26 Gte Laboratories Incorporated Adaptive echo cancellation and equalization system signal processor and method therefor
US4813073A (en) * 1987-07-02 1989-03-14 Codex Corporation Echo cancellation

Also Published As

Publication number Publication date
DE69033577D1 (de) 2000-08-10
DE69024085T2 (de) 1996-07-25
US4987569A (en) 1991-01-22
EP0630119A3 (en) 1995-03-08
EP0632601A2 (en) 1995-01-04
EP0391715A2 (en) 1990-10-10
CA2013797C (en) 1998-01-20
DE69033576T2 (de) 2001-03-08
EP0632601B1 (en) 2000-07-05
EP0391715A3 (en) 1993-01-13
EP0630119B1 (en) 2000-07-05
EP0630119A2 (en) 1994-12-21
DE69033576D1 (de) 2000-08-10
EP0632601A3 (en) 1995-03-08
CA2013797A1 (en) 1990-10-05
DE69024085D1 (de) 1996-01-25
ATE131675T1 (de) 1995-12-15
JPH02288622A (ja) 1990-11-28
EP0391715B1 (en) 1995-12-13
DE69033577T2 (de) 2001-03-08

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Legal Events

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

Effective date: 20090405