CA1169135A - Adaptive filter including a far end energy discriminator - Google Patents

Adaptive filter including a far end energy discriminator

Info

Publication number
CA1169135A
CA1169135A CA000397583A CA397583A CA1169135A CA 1169135 A CA1169135 A CA 1169135A CA 000397583 A CA000397583 A CA 000397583A CA 397583 A CA397583 A CA 397583A CA 1169135 A CA1169135 A CA 1169135A
Authority
CA
Canada
Prior art keywords
signal
average magnitude
input signal
detecting
generating
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
CA000397583A
Other languages
English (en)
French (fr)
Inventor
Donald L. Duttweiler
Timothy J. Zebo
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
Application granted granted Critical
Publication of CA1169135A publication Critical patent/CA1169135A/en
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

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)
CA000397583A 1981-03-05 1982-03-04 Adaptive filter including a far end energy discriminator Expired CA1169135A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/240,977 US4491701A (en) 1981-03-05 1981-03-05 Adaptive filter including a far end energy discriminator
US240,977 1981-03-05

Publications (1)

Publication Number Publication Date
CA1169135A true CA1169135A (en) 1984-06-12

Family

ID=22908700

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000397583A Expired CA1169135A (en) 1981-03-05 1982-03-04 Adaptive filter including a far end energy discriminator

Country Status (10)

Country Link
US (1) US4491701A (US07582779-20090901-C00044.png)
JP (1) JPS58500309A (US07582779-20090901-C00044.png)
BE (1) BE892355A (US07582779-20090901-C00044.png)
CA (1) CA1169135A (US07582779-20090901-C00044.png)
DE (1) DE3235914T1 (US07582779-20090901-C00044.png)
FR (1) FR2501436B1 (US07582779-20090901-C00044.png)
GB (1) GB2095518B (US07582779-20090901-C00044.png)
IT (1) IT1150252B (US07582779-20090901-C00044.png)
NL (1) NL8220077A (US07582779-20090901-C00044.png)
WO (1) WO1982003145A1 (US07582779-20090901-C00044.png)

Families Citing this family (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4467441A (en) * 1982-10-08 1984-08-21 At&T Bell Laboratories Adaptive filter including controlled tap coefficient leakage
US4584441A (en) * 1984-09-07 1986-04-22 At&T Bell Laboratories Bidirectional adaptive voice frequency repeater
US4712235A (en) * 1984-11-19 1987-12-08 International Business Machines Corporation Method and apparatus for improved control and time sharing of an echo canceller
US4773034A (en) * 1985-05-09 1988-09-20 American Telephone And Telegraph Company Adaptive equalizer utilizing a plurality of multiplier-accumulator devices
CA1242541A (en) * 1985-11-25 1988-09-27 Dany Sylvain Echo cancellation in two-wire transmission path repeaters
EP0307765A1 (de) * 1987-09-18 1989-03-22 Siemens Aktiengesellschaft Anordnung zum Erkennen periodischer Signale für einen Sprach-Echokompensator
US5023819A (en) * 1989-06-02 1991-06-11 Halliburton Company Linear shaped filter
JP3135902B2 (ja) * 1990-05-11 2001-02-19 株式会社日立製作所 自動等化器及び半導体集積回路
EP0491063B1 (de) * 1990-12-17 1995-06-21 Siemens Aktiengesellschaft Adaptives Balancefilter
JP3176474B2 (ja) * 1992-06-03 2001-06-18 沖電気工業株式会社 適応ノイズキャンセラ装置
FI935834A (fi) * 1993-12-23 1995-06-24 Nokia Telecommunications Oy Menetelmä kaikukohtaan sovittautumiseksi kaiunpoistajassa
US5666429A (en) * 1994-07-18 1997-09-09 Motorola, Inc. Energy estimator and method therefor
JPH08265224A (ja) * 1995-03-22 1996-10-11 Nec Corp エコーキャンセラ
SE505152C2 (sv) * 1995-10-11 1997-07-07 Ericsson Telefon Ab L M Adaptivt ekosläckningsförfarande
SE517602C2 (sv) 1995-10-20 2002-06-25 Ericsson Telefon Ab L M Fastlåst loop
US6097820A (en) * 1996-12-23 2000-08-01 Lucent Technologies Inc. System and method for suppressing noise in digitally represented voice signals
US6185300B1 (en) * 1996-12-31 2001-02-06 Ericsson Inc. Echo canceler for use in communications system
US5951626A (en) * 1997-10-17 1999-09-14 Lucent Technologies Inc. Adaptive filter
DE19925046A1 (de) * 1999-06-01 2001-05-03 Alcatel Sa Verfahren und Vorrichtung zur Unterdrückung von Rauschen und Echos
US6813352B1 (en) 1999-09-10 2004-11-02 Lucent Technologies Inc. Quadrature filter augmentation of echo canceler basis functions
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
JP3860556B2 (ja) * 2003-04-04 2006-12-20 松下電器産業株式会社 基地局装置及び通信方法
US20090225998A1 (en) * 2005-10-25 2009-09-10 Harry Bachmann Method for determining a transmission function and a device for carrying out said method
US7548791B1 (en) * 2006-05-18 2009-06-16 Adobe Systems Incorporated Graphically displaying audio pan or phase information
US8532802B1 (en) 2008-01-18 2013-09-10 Adobe Systems Incorporated Graphic phase shifter

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3499999A (en) * 1966-10-31 1970-03-10 Bell Telephone Labor Inc Closed loop adaptive echo canceller using generalized filter networks
US3500000A (en) * 1966-10-31 1970-03-10 Myldred P Kelly Self-adaptive echo canceller
US4028506A (en) * 1973-12-12 1977-06-07 Nippon Electric Company, Ltd. Maximum value tracing circuit for digitized voice signals
US3927260A (en) * 1974-05-07 1975-12-16 Atlantic Res Corp Signal identification system
US3937899A (en) * 1975-01-30 1976-02-10 Bell Telephone Laboratories, Incorporated Tone detector using spectrum parameter estimation
US4028496A (en) * 1976-08-17 1977-06-07 Bell Telephone Laboratories, Incorporated Digital speech detector
US4072830A (en) * 1976-10-04 1978-02-07 Bell Telephone Laboratories, Incorporated Variable phase shifter for adaptive echo cancellers
GB2008903B (en) * 1977-08-17 1982-06-30 Gen Electric Co Ltd Amplifier arrangements
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
JPS58500309A (ja) 1983-02-24
GB2095518B (en) 1985-01-30
IT1150252B (it) 1986-12-10
GB2095518A (en) 1982-09-29
BE892355A (fr) 1982-07-01
IT8219971A0 (it) 1982-03-04
DE3235914C2 (US07582779-20090901-C00044.png) 1987-06-04
DE3235914T1 (de) 1983-11-17
FR2501436B1 (US07582779-20090901-C00044.png) 1985-07-26
NL8220077A (nl) 1983-02-01
US4491701A (en) 1985-01-01
WO1982003145A1 (en) 1982-09-16
FR2501436A1 (US07582779-20090901-C00044.png) 1982-09-10
JPH0480569B2 (US07582779-20090901-C00044.png) 1992-12-18

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Legal Events

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