IT1208769B - Teristiche varianti nel tempo procedimento e dispositivo per la cancellazione numerica dell eco generato in collegamenti con carat - Google Patents

Teristiche varianti nel tempo procedimento e dispositivo per la cancellazione numerica dell eco generato in collegamenti con carat

Info

Publication number
IT1208769B
IT1208769B IT8368047A IT6804783A IT1208769B IT 1208769 B IT1208769 B IT 1208769B IT 8368047 A IT8368047 A IT 8368047A IT 6804783 A IT6804783 A IT 6804783A IT 1208769 B IT1208769 B IT 1208769B
Authority
IT
Italy
Prior art keywords
theristics
carat
eco
cancellation
numerical
Prior art date
Application number
IT8368047A
Other languages
English (en)
Other versions
IT8368047A0 (it
Inventor
Roberto Montagna
Luciano Nebbia
Original Assignee
Cselt Centro Studi Lab Telecom
Telespazio Spa
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 Cselt Centro Studi Lab Telecom, Telespazio Spa filed Critical Cselt Centro Studi Lab Telecom
Priority to IT8368047A priority Critical patent/IT1208769B/it
Publication of IT8368047A0 publication Critical patent/IT8368047A0/it
Priority to AU33691/84A priority patent/AU565194B2/en
Priority to US06/659,762 priority patent/US4736414A/en
Priority to DE198484112242T priority patent/DE137508T1/de
Priority to EP84112242A priority patent/EP0137508B1/en
Priority to CA000465213A priority patent/CA1221180A/en
Priority to DE8484112242T priority patent/DE3466456D1/de
Priority to JP59211612A priority patent/JPH0618331B2/ja
Application granted granted Critical
Publication of IT1208769B publication Critical patent/IT1208769B/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
    • H04B3/232—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 phase shift, phase roll or frequency offset correction
    • 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
    • H04B3/234—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 double talk detection
    • 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)
  • Filters That Use Time-Delay Elements (AREA)
IT8368047A 1983-10-12 1983-10-12 Teristiche varianti nel tempo procedimento e dispositivo per la cancellazione numerica dell eco generato in collegamenti con carat IT1208769B (it)

Priority Applications (8)

Application Number Priority Date Filing Date Title
IT8368047A IT1208769B (it) 1983-10-12 1983-10-12 Teristiche varianti nel tempo procedimento e dispositivo per la cancellazione numerica dell eco generato in collegamenti con carat
AU33691/84A AU565194B2 (en) 1983-10-12 1984-09-28 Digital cancellation of echo in connection with time-varying characteristics
US06/659,762 US4736414A (en) 1983-10-12 1984-10-11 Method of and device for the digital cancellation of the echo generated in connections with time-varying characteristics
DE198484112242T DE137508T1 (de) 1983-10-12 1984-10-11 Verfahren und vorrichtung fuer die digitale kompensation des in verbindungen mit zeitvariablen charakteristiken erzeugten echos.
EP84112242A EP0137508B1 (en) 1983-10-12 1984-10-11 Method of and device for the digital cancellation of the echo generated in connections with time-varying characteristics
CA000465213A CA1221180A (en) 1983-10-12 1984-10-11 Method of and device for the digital cancellation of the echo generated in connections with time-varying characteristics
DE8484112242T DE3466456D1 (en) 1983-10-12 1984-10-11 Method of and device for the digital cancellation of the echo generated in connections with time-varying characteristics
JP59211612A JPH0618331B2 (ja) 1983-10-12 1984-10-11 経時変化特性を有する配線において発生するエコ−をディジタル消去するための装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT8368047A IT1208769B (it) 1983-10-12 1983-10-12 Teristiche varianti nel tempo procedimento e dispositivo per la cancellazione numerica dell eco generato in collegamenti con carat

Publications (2)

Publication Number Publication Date
IT8368047A0 IT8368047A0 (it) 1983-10-12
IT1208769B true IT1208769B (it) 1989-07-10

Family

ID=11307441

Family Applications (1)

Application Number Title Priority Date Filing Date
IT8368047A IT1208769B (it) 1983-10-12 1983-10-12 Teristiche varianti nel tempo procedimento e dispositivo per la cancellazione numerica dell eco generato in collegamenti con carat

Country Status (7)

Country Link
US (1) US4736414A (it)
EP (1) EP0137508B1 (it)
JP (1) JPH0618331B2 (it)
AU (1) AU565194B2 (it)
CA (1) CA1221180A (it)
DE (2) DE3466456D1 (it)
IT (1) IT1208769B (it)

Families Citing this family (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59151546A (ja) * 1983-02-18 1984-08-30 Nec Corp 適応形反響消去装置
EP0199879B1 (en) * 1985-04-30 1990-03-21 International Business Machines Corporation A process and system for improving echo cancellation within a transmission network
EP0221221B1 (en) * 1985-10-30 1991-12-27 International Business Machines Corporation A process for determining an echo path flat delay and echo canceler using said process
NL8600087A (nl) * 1986-01-17 1987-08-17 Philips Nv Inrichting voor vol-duplex datatransmissie over tweedraadsverbindingen.
IT1216448B (it) * 1986-03-27 1990-02-28 Sip Perfezionamenti ai cancellatori d'eco nei sistemi di trasmissione numerica bidirezionale
NL8600817A (nl) * 1986-03-28 1987-10-16 At & T & Philips Telecomm Adaptief filter voor het vormen van een echokompensatiesignaal in een zend-ontvangstelsel voor het in duplexvorm bedrijven van digitale communicatie over een enkel geleiderpaar.
US4970715A (en) * 1987-03-27 1990-11-13 Universal Data Systems, Inc. Modem with improved remote echo location and cancellation
NL8701633A (nl) * 1987-07-10 1989-02-01 Philips Nv Digitale echocompensator.
DE3879838D1 (de) * 1987-09-30 1993-05-06 Siemens Ag Verfahren und schaltungsanordnung zur erzeugung von filtersignalen.
DE58905114D1 (de) * 1988-06-13 1993-09-09 Siemens Ag Verfahren zur stoerunterdrueckung bei ultraschall-abstandsmessungen.
US5293611A (en) * 1988-09-20 1994-03-08 Hitachi, Ltd. Digital signal processor utilizing a multiply-and-add function for digital filter realization
IT1228106B (it) * 1988-12-21 1991-05-28 Sits Soc It Telecom Siemens Procedimento e dispositivo per la cancellazione numerica adattativa dell'eco generato in collegamenti telefonici con caratteristiche varianti nel tempo
US5146494A (en) * 1989-07-31 1992-09-08 At&T Bell Laboratories Overlapping look-up-and-add echo canceller requiring a smaller memory size
SE9003373D0 (sv) * 1990-10-22 1990-10-22 Sandard Radio & Telefon Ab Srt Metod att beraekna ett impulssvar
IT1254819B (it) * 1992-02-24 1995-10-11 Sits Soc It Telecom Siemens Procedimento e dispositivo per la cancellazione numerica adattativa dell'eco generato in collegamenti telefonici non stazionari
US5295136A (en) * 1992-04-13 1994-03-15 Motorola, Inc. Method of performing convergence in a, least mean square, adaptive filter, echo canceller
JPH0627752U (ja) * 1992-09-18 1994-04-12 日本電気ホームエレクトロニクス株式会社 搬送装置
GB2271909B (en) * 1992-10-21 1996-05-22 Lotus Car Adaptive control system
FR2713417B1 (fr) * 1993-12-02 1996-02-02 Europ Agence Spatiale Procédé de réglage adaptatif d'un suppresseur d'écho.
FR2715784B1 (fr) * 1994-02-02 1996-03-29 Jacques Prado Procédé et dispositif d'analyse d'un signal de retour et annuleur d'écho adaptatif en comportant application.
TW281833B (en) * 1995-03-03 1996-07-21 At & T Corp Method and apparatus for reducing residual far-end echo in voice communications networks
US5625646A (en) * 1995-06-26 1997-04-29 Motorola, Inc. Method, device, DSP and modem for efficient echo canceler phase roll tracking
US5675644A (en) * 1995-09-26 1997-10-07 Qualcomm Incorporated Method and apparatus for canceling echo accounting for delay variations
SE505692C2 (sv) * 1995-12-18 1997-09-29 Ericsson Telefon Ab L M Förfarande och anordning för ekosläckning genom skattning av effekt hos residualsignal
US5920548A (en) * 1996-10-01 1999-07-06 Telefonaktiebolaget L M Ericsson Echo path delay estimation
US6044068A (en) * 1996-10-01 2000-03-28 Telefonaktiebolaget Lm Ericsson Silence-improved echo canceller
JP3211884B2 (ja) * 1998-08-14 2001-09-25 日本電気株式会社 音響エコーキャンセラ
US7512149B2 (en) * 2003-04-23 2009-03-31 At & T Intellectual Property Ii, L.P. Bit and power allocation scheme for full-duplex transmission with echo cancellation in multicarrier-based modems
SE516143C2 (sv) 1999-05-10 2001-11-26 Ericsson Telefon Ab L M Skattning av ren fördröjning
US6654463B1 (en) * 1999-05-28 2003-11-25 3Com Corporation Round trip delay estimator and compensator for the echo canceller
US7164659B2 (en) * 1999-12-09 2007-01-16 Broadcom Corporation Adaptive gain control based on echo canceller performance information
FR2811492A1 (fr) * 2000-07-05 2002-01-11 St Microelectronics Sa Cirtcuit d'emission et de reception comportant un annuleur d'echo
US7151803B1 (en) 2002-04-01 2006-12-19 At&T Corp. Multiuser allocation method for maximizing transmission capacity

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3535473A (en) * 1966-10-31 1970-10-20 Bell Telephone Labor Inc Self-adjusting echo canceller
NL163926C (nl) * 1970-03-12 1980-10-15 Siemens Ag Groep van echo-onderdrukkingsinrichtingen.
US3721777A (en) * 1971-11-26 1973-03-20 Bell Telephone Labor Inc Echo path delay simulator for use with adaptive echo cancellers
FR2277470A1 (fr) * 1974-07-03 1976-01-30 Cit Alcatel Dispositif de centrage d'un filtre transversal d'un annuleur d'echo
JPS5225516A (en) * 1975-08-22 1977-02-25 Kokusai Denshin Denwa Co Ltd <Kdd> Echo eraser unit
SE416367B (sv) * 1976-09-07 1980-12-15 Western Electric Co Ekoelimineringsanordning
IT1115559B (it) * 1978-08-29 1986-02-03 Cselt Centro Studi Lab Telecom Procedimento e dispositivo per la cancellazione numerica dell eco
US4282411A (en) * 1979-06-04 1981-08-04 Tellabs, Inc. Residual echo suppressor for echo canceller
US4360712A (en) * 1979-09-05 1982-11-23 Communications Satellite Corporation Double talk detector for echo cancellers
FR2487144B1 (fr) * 1980-07-21 1986-10-24 Trt Telecom Radio Electr Dispositif d'annulation d'un signal d'echo composite
SE426765B (sv) * 1981-11-02 1983-02-07 Ellemtel Utvecklings Ab Balansfilter av fir-typ ingaende i sendar-mottagarenheten i ett telekommunikationssystem
US4582963A (en) * 1982-07-29 1986-04-15 Rockwell International Corporation Echo cancelling using adaptive bulk delay and filter
US4587382A (en) * 1982-07-29 1986-05-06 Gte Lenkurt Incorporated Echo canceller using end delay measurement
FR2538975A1 (fr) * 1982-12-30 1984-07-06 Trt Telecom Radio Electr Procede utilise dans un dispositif d'annulation d'echo pour la mesure d'un retard d'echo et dispositif de mise en oeuvre de ce procede
US4546216A (en) * 1983-01-27 1985-10-08 At&T Bell Laboratories Echo suppressor for improving echo canceler performance
US4562312A (en) * 1983-02-17 1985-12-31 At&T Bell Laboratories Subsampling delay estimator for an echo canceler

Also Published As

Publication number Publication date
AU3369184A (en) 1985-04-18
EP0137508A1 (en) 1985-04-17
JPS60167530A (ja) 1985-08-30
DE137508T1 (de) 1986-01-02
AU565194B2 (en) 1987-09-10
CA1221180A (en) 1987-04-28
DE3466456D1 (en) 1987-10-29
EP0137508B1 (en) 1987-09-23
IT8368047A0 (it) 1983-10-12
US4736414A (en) 1988-04-05
JPH0618331B2 (ja) 1994-03-09

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TA Fee payment date (situation as of event date), data collected since 19931001

Effective date: 19951011