ES8101825A1 - Perfeccionamientos en filtros adaptables digitales - Google Patents

Perfeccionamientos en filtros adaptables digitales

Info

Publication number
ES8101825A1
ES8101825A1 ES492652A ES492652A ES8101825A1 ES 8101825 A1 ES8101825 A1 ES 8101825A1 ES 492652 A ES492652 A ES 492652A ES 492652 A ES492652 A ES 492652A ES 8101825 A1 ES8101825 A1 ES 8101825A1
Authority
ES
Spain
Prior art keywords
tap coefficient
adder
input
coefficient signal
signals
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
ES492652A
Other languages
English (en)
Other versions
ES492652A0 (es
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AT&T Corp
Original Assignee
Western Electric Co Inc
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 Western Electric Co Inc filed Critical Western Electric Co Inc
Publication of ES492652A0 publication Critical patent/ES492652A0/es
Publication of ES8101825A1 publication Critical patent/ES8101825A1/es
Expired legal-status Critical Current

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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H21/00—Adaptive networks
    • H03H21/0012—Digital adaptive filters
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H21/00—Adaptive networks
    • H03H21/0012—Digital adaptive filters
    • H03H21/0067—Means or methods for compensation of undesirable effects

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Filters That Use Time-Delay Elements (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

FILTRO ADAPTABLE DIGITAL PARA LA SUPRESION DE ECOS. COMPRENDE UN DISPOSITIVO QUE RESPONDE A UN COMPONENTE DE ACTUALIZACION DE COEFICIENTES Y A UN COEFICIENTE DE RAMIFICACION PARA EXCITAR DEBILMENTE LA SEÑAL DE COEFICIENTE DE RAMIFICACION HACIA UN VALOR OPTIMO (APROXIMANDOLO A CERO), INTRODUCIENDO INTERMITENTEMENTE DERIVACION. LA DERIVACION SE INTRODUCE PERIODICAMENTE DURANTE UN MUESTREO DE UN NUMERO PREDETERMINADO DE PERIODOS DE MUESTRA. EL FILTRO COMPRENDE UN APARATO QUE PROPORCIONA COEFICIENTES DE RAMIFICACIONES PARA PROLONGAR EL COMPONENTE DE ACTUALIZACION A TRAVES DE UN CONVERTIDOR HASTA UNA PRIMERA ENTRADA DE UN ADICIONADOR DIGITAL.
ES492652A 1979-06-21 1980-06-20 Perfeccionamientos en filtros adaptables digitales Expired ES8101825A1 (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/050,890 US4243959A (en) 1979-06-21 1979-06-21 Adaptive filter with tap coefficient leakage

Publications (2)

Publication Number Publication Date
ES492652A0 ES492652A0 (es) 1980-12-16
ES8101825A1 true ES8101825A1 (es) 1980-12-16

Family

ID=21968111

Family Applications (1)

Application Number Title Priority Date Filing Date
ES492652A Expired ES8101825A1 (es) 1979-06-21 1980-06-20 Perfeccionamientos en filtros adaptables digitales

Country Status (8)

Country Link
US (1) US4243959A (es)
EP (1) EP0021317B1 (es)
JP (1) JPS56500734A (es)
AU (1) AU536706B2 (es)
CA (1) CA1143440A (es)
DE (1) DE3070575D1 (es)
ES (1) ES8101825A1 (es)
WO (1) WO1980002897A1 (es)

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1982003144A1 (en) * 1981-03-05 1982-09-16 Western Electric Co Energy band discriminator
JPS5961233A (ja) * 1982-09-29 1984-04-07 Nec Corp 適応型反響消去装置
US4467441A (en) * 1982-10-08 1984-08-21 At&T Bell Laboratories Adaptive filter including controlled tap coefficient leakage
JPS59151546A (ja) * 1983-02-18 1984-08-30 Nec Corp 適応形反響消去装置
FR2564667B1 (fr) * 1984-05-15 1986-09-19 Trt Telecom Radio Electr Dispositif de commande d'un annuleur d'echo et d'un ecreteur de centre
AT391784B (de) * 1987-11-25 1990-11-26 Siemens Ag Oesterreich Verfahren zur adaptiven kompensation eines echos in einer kommunikationseinrichtung
US5016280A (en) * 1988-03-23 1991-05-14 Central Institute For The Deaf Electronic filters, hearing aids and methods
US5225836A (en) * 1988-03-23 1993-07-06 Central Institute For The Deaf Electronic filters, repeated signal charge conversion apparatus, hearing aids and methods
JP2545614B2 (ja) * 1989-09-20 1996-10-23 富士通株式会社 自動等化器のタップ係数保護方式
JPH04185011A (ja) * 1990-11-20 1992-07-01 Nec Corp 適応フィルタの発散防止方法及び装置
US5307375A (en) * 1992-11-19 1994-04-26 General Instrument Corporation Two stage accumulator for use in updating coefficients
US5937007A (en) * 1997-04-30 1999-08-10 Lucent Technologies Inc. Method for providing tap leakage in adaptive equalizer systems
US6223194B1 (en) 1997-06-11 2001-04-24 Nec Corporation Adaptive filter, step size control method thereof, and record medium therefor
US6163572A (en) * 1998-04-29 2000-12-19 Nortel Networks Limited Method of reducing coefficient leakage noise introduced to an equalizer during steady state operation
US6823000B1 (en) * 1999-02-26 2004-11-23 Texas Instruments Incorporated Method and apparatus for optimal dot product calculation
US6343306B1 (en) * 1999-05-18 2002-01-29 Sun Microsystems, Inc. High speed one's complement adder
US7023963B1 (en) 2002-09-18 2006-04-04 Adtran, Inc. DSL line card echo canceler-based mechanism for locating telecommunication line fault
GB2397990A (en) * 2003-01-31 2004-08-04 Mitel Networks Corp Echo cancellation/suppression and double-talk detection in communication paths
US7460498B2 (en) 2003-12-04 2008-12-02 Adtran, Inc. System and method for detecting anomalies along telecommunication lines
US7596176B2 (en) * 2005-10-31 2009-09-29 International Business Machines Corporation Apparatus, system, and method for adaptive asynchronous equalization using leakage
US8194873B2 (en) * 2006-06-26 2012-06-05 Davis Pan Active noise reduction adaptive filter leakage adjusting
US8204242B2 (en) * 2008-02-29 2012-06-19 Bose Corporation Active noise reduction adaptive filter leakage adjusting
US8355512B2 (en) * 2008-10-20 2013-01-15 Bose Corporation Active noise reduction adaptive filter leakage adjusting
US8306240B2 (en) * 2008-10-20 2012-11-06 Bose Corporation Active noise reduction adaptive filter adaptation rate adjusting

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3500000A (en) * 1966-10-31 1970-03-10 Myldred P Kelly Self-adaptive echo canceller
US3499999A (en) * 1966-10-31 1970-03-10 Bell Telephone Labor Inc Closed loop adaptive echo canceller using generalized filter networks
US4126770A (en) * 1975-11-07 1978-11-21 Kokusai Denshin Denwa Kabushiki Kaisha Echo canceller
US4129753A (en) * 1977-12-09 1978-12-12 Bell Telephone Laboratories, Incorporated Echo canceller using feedback to improve speech detector performance

Also Published As

Publication number Publication date
EP0021317A3 (en) 1981-09-02
US4243959A (en) 1981-01-06
EP0021317A2 (en) 1981-01-07
ES492652A0 (es) 1980-12-16
WO1980002897A1 (en) 1980-12-24
AU6124380A (en) 1981-01-05
CA1143440A (en) 1983-03-22
AU536706B2 (en) 1984-05-17
DE3070575D1 (en) 1985-06-05
EP0021317B1 (en) 1985-05-02
JPS56500734A (es) 1981-05-28

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