IT955642B - Eliminatore d eco particolarmente utile in una rete telefonica a lunga distanza - Google Patents

Eliminatore d eco particolarmente utile in una rete telefonica a lunga distanza

Info

Publication number
IT955642B
IT955642B IT24542/72A IT2454272A IT955642B IT 955642 B IT955642 B IT 955642B IT 24542/72 A IT24542/72 A IT 24542/72A IT 2454272 A IT2454272 A IT 2454272A IT 955642 B IT955642 B IT 955642B
Authority
IT
Italy
Prior art keywords
telephone network
long distance
especially useful
distance telephone
echo eliminator
Prior art date
Application number
IT24542/72A
Other languages
English (en)
Original Assignee
Nippon Electric Co
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 filed Critical Nippon Electric Co
Application granted granted Critical
Publication of IT955642B publication Critical patent/IT955642B/it

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
IT24542/72A 1971-05-19 1972-05-18 Eliminatore d eco particolarmente utile in una rete telefonica a lunga distanza IT955642B (it)

Applications Claiming Priority (2)

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

Publications (1)

Publication Number Publication Date
IT955642B true IT955642B (it) 1973-09-29

Family

ID=26372630

Family Applications (1)

Application Number Title Priority Date Filing Date
IT24542/72A IT955642B (it) 1971-05-19 1972-05-18 Eliminatore d eco particolarmente utile in una rete telefonica a lunga distanza

Country Status (5)

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

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 (de) * 1973-07-06 1982-05-27 Siemens AG, 1000 Berlin und 8000 München Echokompensator
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 (ja) * 1983-02-18 1984-08-30 Nec Corp 適応形反響消去装置
FR2556530B1 (fr) * 1983-10-28 1986-04-04 Telediffusion Fse Dispositif de correction d'echos, notamment pour systeme de diffusion de donnees
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 (nl) * 1987-07-10 1989-02-01 Philips Nv Digitale echocompensator.
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
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
US5978473A (en) * 1995-12-27 1999-11-02 Ericsson Inc. Gauging convergence of adaptive filters
KR100233463B1 (ko) * 1997-03-07 1999-12-01 윤종용 반향제거장치 및 방법
US6256383B1 (en) * 1997-11-07 2001-07-03 Legerity, Inc. IIR filter of adaptive balance circuit for long tail echo cancellation
US6181793B1 (en) 1997-11-14 2001-01-30 Tellabs Operations, Inc. Echo canceller employing dual-H architecture having improved coefficient transfer
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
US6198819B1 (en) * 1997-11-14 2001-03-06 Tellabs Operations, Inc. Echo canceller having improved non-linear processor
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
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
GB201309773D0 (en) 2013-05-31 2013-07-17 Microsoft Corp Echo removal
GB201309779D0 (en) 2013-05-31 2013-07-17 Microsoft Corp Echo removal
GB201309771D0 (en) * 2013-05-31 2013-07-17 Microsoft Corp Echo removal
GB201309777D0 (en) 2013-05-31 2013-07-17 Microsoft Corp Echo suppression
CN109309764B (zh) * 2017-07-28 2021-09-03 北京搜狗科技发展有限公司 音频数据处理方法、装置、电子设备和存储介质

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 (de) * 1968-12-20 1971-04-15 Schaltungsanordnung zur echounterdrueckung in einem sprech kreis auf einem vierdraht uebertragungssystem bei einem uebergang auf einen zweidrahtuebertragungsweg
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
GB1380944A (en) 1975-01-22
CA949247A (en) 1974-06-11
DE2224403A1 (de) 1973-03-22
DE2224403B2 (de) 1975-01-30
DE2224403C3 (de) 1983-12-22
US3787645A (en) 1974-01-22

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