AU514263B2 - Digital echo canceller - Google Patents

Digital echo canceller

Info

Publication number
AU514263B2
AU514263B2 AU32430/78A AU3243078A AU514263B2 AU 514263 B2 AU514263 B2 AU 514263B2 AU 32430/78 A AU32430/78 A AU 32430/78A AU 3243078 A AU3243078 A AU 3243078A AU 514263 B2 AU514263 B2 AU 514263B2
Authority
AU
Australia
Prior art keywords
echo canceller
digital echo
digital
canceller
echo
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
AU32430/78A
Other languages
English (en)
Other versions
AU3243078A (en
Inventor
J-P. and Macchi C. D Baudoux
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.)
T.R.T.
Original Assignee
Telecommunications Radioelectriques et Telephoniques SA TRT
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 FR7701197A external-priority patent/FR2377734A1/fr
Priority claimed from FR7718342A external-priority patent/FR2394938A2/fr
Application filed by Telecommunications Radioelectriques et Telephoniques SA TRT filed Critical Telecommunications Radioelectriques et Telephoniques SA TRT
Publication of AU3243078A publication Critical patent/AU3243078A/en
Application granted granted Critical
Publication of AU514263B2 publication Critical patent/AU514263B2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
    • H04L5/1423—Two-way operation using the same type of signal, i.e. duplex for simultaneous baseband signals
    • 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)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Filters That Use Time-Delay Elements (AREA)
AU32430/78A 1977-01-17 1978-01-13 Digital echo canceller Expired AU514263B2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR7701197A FR2377734A1 (fr) 1977-01-17 1977-01-17 Annuleur d'echo numerique pour modem de transmission de donnees par modulation d'une porteuse
FRFR7701197 1977-01-17
FR7718342A FR2394938A2 (fr) 1977-06-15 1977-06-15 Annuleur d'echo numerique pour modem de transmission de donnees par modulation d'une porteuse
FRFR7718342 1977-06-15

Publications (2)

Publication Number Publication Date
AU3243078A AU3243078A (en) 1979-07-19
AU514263B2 true AU514263B2 (en) 1981-01-29

Family

ID=26219806

Family Applications (1)

Application Number Title Priority Date Filing Date
AU32430/78A Expired AU514263B2 (en) 1977-01-17 1978-01-13 Digital echo canceller

Country Status (7)

Country Link
US (1) US4162378A (en, 2012)
JP (1) JPS5390712A (en, 2012)
AU (1) AU514263B2 (en, 2012)
DE (1) DE2801375C3 (en, 2012)
IT (1) IT1091970B (en, 2012)
NL (1) NL7800408A (en, 2012)
SE (1) SE426763B (en, 2012)

Families Citing this family (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1115559B (it) * 1978-08-29 1986-02-03 Cselt Centro Studi Lab Telecom Procedimento e dispositivo per la cancellazione numerica dell eco
FR2448258A1 (fr) * 1979-02-05 1980-08-29 Trt Telecom Radio Electr Systeme de test d'un dispositif muni d'un annuleur d'echo
NL7903759A (nl) * 1979-05-14 1980-11-18 Philips Nv Echocompensator met hoogdoorlaatfilter.
DE2920575C2 (de) * 1979-05-21 1981-09-17 Siemens AG, 1000 Berlin und 8000 München Digital-Fernmeldesystem mit mindestens einem Vierdrahtleitungsabschnitt
FR2460075B1 (fr) * 1979-06-22 1988-12-09 Cit Alcatel Annuleur d'echo adaptatif pour transmission de donnees en duplex
FR2475322A1 (fr) * 1980-02-01 1981-08-07 Trt Telecom Radio Electr Annuleur d'echo a circuits de calcul simplifies
FR2487144B1 (fr) * 1980-07-21 1986-10-24 Trt Telecom Radio Electr Dispositif d'annulation d'un signal d'echo composite
CA1180141A (en) * 1980-11-15 1984-12-27 Kenzo Takahashi Echo canceller system
US4464545A (en) * 1981-07-13 1984-08-07 Bell Telephone Laboratories, Incorporated Echo canceller
DE3129343C2 (de) * 1981-07-24 1987-01-29 Siemens AG, 1000 Berlin und 8000 München Adaptiver Entzerrer für ein demoduliertes QAM-Signal
SE426764B (sv) * 1981-11-02 1983-02-07 Ellemtel Utvecklings Ab Forfarande att astadkomma adaptiv ekoeliminering vid overforing av digital information i duplex jemte anordning for utforande av forfarandet
SE426765B (sv) * 1981-11-02 1983-02-07 Ellemtel Utvecklings Ab Balansfilter av fir-typ ingaende i sendar-mottagarenheten i ett telekommunikationssystem
FR2517905B1 (fr) * 1981-12-09 1985-11-29 Telecommunications Sa Dispositif d'initialisation pour annuleur d'echo et son application aux echos lointains
FR2528642B1 (fr) * 1982-06-11 1985-10-25 Cit Alcatel Annuleur d'echo pour transmission de donnees
US4669116A (en) * 1982-12-09 1987-05-26 Regents Of The University Of California Non-linear echo cancellation of data signals
FR2540314A1 (fr) * 1983-01-31 1984-08-03 Trt Telecom Radio Electr Procede d'initialisation des coefficients de filtres dans un dispositif d'annulation d'echos proche et lointain et dispositif de mise en oeuvre de ce procede
US4594479A (en) * 1983-08-18 1986-06-10 At&T Information Systems Inc. Bell Telephone Laboratories, Inc. Fast start-up of adaptive echo canceler or echo measurement device
US4682358A (en) * 1984-12-04 1987-07-21 American Telephone And Telegraph Company Echo canceller
JPH0616592B2 (ja) * 1985-12-23 1994-03-02 富士通株式会社 Ｆｄｍモデム
JPS62150416U (en, 2012) * 1986-03-17 1987-09-24
US4849945A (en) * 1986-12-08 1989-07-18 Tomex Corporation Seismic processing and imaging with a drill-bit source
US4989221A (en) * 1987-03-30 1991-01-29 Codex Corporation Sample rate converter
JP2518394B2 (ja) * 1989-05-24 1996-07-24 日本電気株式会社 エコ―キャンセラ方式全二重送受信回路
US5487109A (en) * 1994-05-17 1996-01-23 Bellsouth Corporation End office of a telephone system with a zero loss plan
US6078645A (en) * 1997-02-20 2000-06-20 Lucent Technologies Inc. Apparatus and method for monitoring full duplex data communications
GB2482442B (en) * 2009-03-17 2015-04-29 Skyworks Solutions Inc Saw-less, LNA-less lwo noise receiver

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3732410A (en) * 1969-12-22 1973-05-08 Postmaster Department Res Labo Self adaptive filter and control circuit therefor
JPS5226973B2 (en, 2012) * 1973-01-19 1977-07-18
US4087654A (en) * 1975-11-28 1978-05-02 Bell Telephone Laboratories, Incorporated Echo canceller for two-wire full duplex data transmission
NL170688C (nl) * 1976-06-28 1982-12-01 Philips Nv Inrichting voor simultane tweerichtingsdatatransmissie over tweedraadsverbindingen.
US4074086A (en) * 1976-09-07 1978-02-14 Bell Telephone Laboratories, Incorporated Joint adaptive echo canceller and equalizer for two-wire full-duplex data transmission
US4072830A (en) * 1976-10-04 1978-02-07 Bell Telephone Laboratories, Incorporated Variable phase shifter for adaptive echo cancellers

Also Published As

Publication number Publication date
JPS5390712A (en) 1978-08-09
NL7800408A (nl) 1978-07-19
JPS618618B2 (en, 2012) 1986-03-15
DE2801375C3 (de) 1982-01-28
DE2801375A1 (de) 1978-07-20
SE426763B (sv) 1983-02-07
DE2801375B2 (de) 1981-05-14
SE7800390L (sv) 1978-07-18
IT1091970B (it) 1985-07-06
IT7819251A0 (it) 1978-01-13
US4162378A (en) 1979-07-24
AU3243078A (en) 1979-07-19

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