CA949247A - Echo canceller having two echo path models - Google Patents

Echo canceller having two echo path models

Info

Publication number
CA949247A
CA949247A CA142,520A CA142520A CA949247A CA 949247 A CA949247 A CA 949247A CA 142520 A CA142520 A CA 142520A CA 949247 A CA949247 A CA 949247A
Authority
CA
Canada
Prior art keywords
echo
path models
canceller
echo canceller
models
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
CA142,520A
Other versions
CA142520S (en
Inventor
Kazuo Ochiai
Takashi Araseki
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.)
NEC Corp
Original Assignee
Nippon Electric Co Ltd
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 JP3385871A external-priority patent/JPS5635052B1/ja
Priority claimed from JP6173671A external-priority patent/JPS5429847B2/ja
Application filed by Nippon Electric Co Ltd filed Critical Nippon Electric Co Ltd
Application granted granted Critical
Publication of CA949247A publication Critical patent/CA949247A/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
    • 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
CA142,520A 1971-05-19 1972-05-18 Echo canceller having two echo path models Expired CA949247A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP3385871A JPS5635052B1 (en) 1971-05-19 1971-05-19
JP6173671A JPS5429847B2 (en) 1971-08-13 1971-08-13

Publications (1)

Publication Number Publication Date
CA949247A true CA949247A (en) 1974-06-11

Family

ID=26372630

Family Applications (1)

Application Number Title Priority Date Filing Date
CA142,520A Expired CA949247A (en) 1971-05-19 1972-05-18 Echo canceller having two echo path models

Country Status (5)

Country Link
US (1) US3787645A (en)
CA (1) CA949247A (en)
DE (1) DE2224403C3 (en)
GB (1) GB1380944A (en)
IT (1) IT955642B (en)

Families Citing this family (42)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1434239A (en) * 1972-08-10 1976-05-05 Siemens Ag Echo cancellers
DE2334546C2 (en) * 1973-07-06 1982-05-27 Siemens AG, 1000 Berlin und 8000 München Echo canceller
JPS51144111A (en) * 1975-06-05 1976-12-10 Kokusai Denshin Denwa Co Ltd <Kdd> Echo cancelling method
JPS5737937A (en) * 1980-08-15 1982-03-02 Hitachi Ltd Automatic hybrid circuit
US4669115A (en) * 1981-12-07 1987-05-26 Regents Of The University Of California Hybrid circuit and method
US4621172A (en) * 1982-12-22 1986-11-04 Nec Corporation Fast convergence method and system for echo canceller
US4628156A (en) * 1982-12-27 1986-12-09 International Business Machines Corporation Canceller trained echo suppressor
US4554417A (en) * 1983-02-04 1985-11-19 At&T Bell Laboratories Tandem adaptive echo canceler arrangement
US4574166A (en) * 1983-02-04 1986-03-04 At&T Bell Laboratories Tandem adaptive filter arrangement
JPS59151546A (en) * 1983-02-18 1984-08-30 Nec Corp Adaptive type echo cancellor
FR2556530B1 (en) * 1983-10-28 1986-04-04 Telediffusion Fse ECHO CORRECTION DEVICE, ESPECIALLY FOR A DATA BROADCASTING SYSTEM
US4707824A (en) * 1983-12-15 1987-11-17 Nec Corporation Method and apparatus for cancelling echo
GB8423017D0 (en) * 1984-09-12 1984-10-17 Plessey Co Plc Echo canceller
AU4695485A (en) * 1984-09-21 1986-03-27 Alcatel N.V. Digital hybrid
US4805215A (en) * 1986-10-01 1989-02-14 Racal Data Communications Inc. Adaptive echo canceller with sparse dynamically positioned taps
NL8701633A (en) * 1987-07-10 1989-02-01 Philips Nv DIGITAL ECHO COMPENSATOR.
GB2237483A (en) * 1989-10-11 1991-05-01 Plessey Co Plc An adaptive fir filter having restricted coefficient ranges
US5809463A (en) * 1995-09-15 1998-09-15 Hughes Electronics Method of detecting double talk in an echo canceller
SE505150C3 (en) 1995-10-18 1997-08-04 Ericsson Telefon Ab L M Adaptive dual filter echo leakage procedure
JP3199155B2 (en) * 1995-10-18 2001-08-13 日本電信電話株式会社 Echo canceller
SE517602C2 (en) * 1995-10-20 2002-06-25 Ericsson Telefon Ab L M Locked loop
US5978473A (en) * 1995-12-27 1999-11-02 Ericsson Inc. Gauging convergence of adaptive filters
KR100233463B1 (en) * 1997-03-07 1999-12-01 윤종용 Apparatus and method for noise cancellation
US6256383B1 (en) * 1997-11-07 2001-07-03 Legerity, Inc. IIR filter of adaptive balance circuit for long tail echo cancellation
US6198819B1 (en) * 1997-11-14 2001-03-06 Tellabs Operations, Inc. Echo canceller having improved non-linear processor
US6240180B1 (en) * 1997-11-14 2001-05-29 Tellabs Operations, Inc. Echo canceller employing dual-H architecture having split adaptive gain settings
US6031908A (en) * 1997-11-14 2000-02-29 Tellabs Operations, Inc. Echo canceller employing dual-H architecture having variable adaptive gain settings
US6028929A (en) * 1997-11-14 2000-02-22 Tellabs Operations, Inc. Echo canceller employing dual-H architecture having improved non-linear echo path detection
US6266409B1 (en) * 1997-11-14 2001-07-24 Tellabs Operations, Inc. Echo canceller employing dual-H architecture having improved double-talk detection
US6181793B1 (en) 1997-11-14 2001-01-30 Tellabs Operations, Inc. Echo canceller employing dual-H architecture having improved coefficient transfer
JP3566158B2 (en) * 1999-12-07 2004-09-15 三菱電機株式会社 Echo canceller device
US7164659B2 (en) * 1999-12-09 2007-01-16 Broadcom Corporation Adaptive gain control based on echo canceller performance information
US7085245B2 (en) * 2001-11-05 2006-08-01 3Dsp Corporation Coefficient domain history storage of voice processing systems
US7817797B2 (en) * 2006-06-07 2010-10-19 Mitel Networks Corporation Method and apparatus for detecting echo path changes in an acoustic echo canceller
US20080080702A1 (en) * 2006-10-03 2008-04-03 Santera Systems, Inc. Method, System, and Computer-Readable Medium for Calculating an Echo Path Delay
US8411871B2 (en) * 2007-08-22 2013-04-02 Lantiq Deutschland Gmbh Echo cancellation
US9076426B2 (en) 2011-12-20 2015-07-07 Avago Technologies General Ip (Singapore) Pte. Ltd. Training an echo canceller in severe noise
GB201309779D0 (en) 2013-05-31 2013-07-17 Microsoft Corp Echo removal
GB201309773D0 (en) 2013-05-31 2013-07-17 Microsoft Corp Echo removal
GB201309777D0 (en) 2013-05-31 2013-07-17 Microsoft Corp Echo suppression
GB201309771D0 (en) * 2013-05-31 2013-07-17 Microsoft Corp Echo removal
CN109309764B (en) * 2017-07-28 2021-09-03 北京搜狗科技发展有限公司 Audio data processing method and device, electronic equipment and storage medium

Family Cites Families (3)

* 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
DE1816153B2 (en) * 1968-12-20 1971-04-15 CIRCUIT ARRANGEMENT FOR ECHO SUPPRESSION IN A TALK CIRCUIT ON A FOUR WIRE TRANSMISSION SYSTEM IN THE CASE OF A TRANSITION TO A TWO WIRE TRANSMISSION PATH
US3732410A (en) * 1969-12-22 1973-05-08 Postmaster Department Res Labo Self adaptive filter and control circuit therefor

Also Published As

Publication number Publication date
IT955642B (en) 1973-09-29
DE2224403C3 (en) 1983-12-22
DE2224403B2 (en) 1975-01-30
DE2224403A1 (en) 1973-03-22
GB1380944A (en) 1975-01-22
US3787645A (en) 1974-01-22

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