DK306483A - Fremgangsmaade til at frembringe adaptiv ekko-eliminering ved overfoersel af digital information i duplex samt apparat til udoevelse af fremgangsmaaden - Google Patents

Fremgangsmaade til at frembringe adaptiv ekko-eliminering ved overfoersel af digital information i duplex samt apparat til udoevelse af fremgangsmaaden Download PDF

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Publication number
DK306483A
DK306483A DK306483A DK306483A DK306483A DK 306483 A DK306483 A DK 306483A DK 306483 A DK306483 A DK 306483A DK 306483 A DK306483 A DK 306483A DK 306483 A DK306483 A DK 306483A
Authority
DK
Denmark
Prior art keywords
procedure
exercising
duplex
elimination
transfer
Prior art date
Application number
DK306483A
Other languages
Danish (da)
English (en)
Other versions
DK306483D0 (da
Inventor
Bengt Roland Carlqvist
Lars Tommy Edvard Svensson
Original Assignee
Ericsson Telefon Ab L M
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 Ericsson Telefon Ab L M filed Critical Ericsson Telefon Ab L M
Publication of DK306483D0 publication Critical patent/DK306483D0/da
Publication of DK306483A publication Critical patent/DK306483A/da

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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
    • 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
    • H04B3/231—Echo cancellers using readout of a memory to provide the echo replica

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)
  • Bidirectional Digital Transmission (AREA)
  • Analogue/Digital Conversion (AREA)
DK306483A 1981-11-02 1983-07-01 Fremgangsmaade til at frembringe adaptiv ekko-eliminering ved overfoersel af digital information i duplex samt apparat til udoevelse af fremgangsmaaden DK306483A (da)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8106444A SE426764B (sv) 1981-11-02 1981-11-02 Forfarande att astadkomma adaptiv ekoeliminering vid overforing av digital information i duplex jemte anordning for utforande av forfarandet
PCT/SE1982/000363 WO1983001716A1 (fr) 1981-11-02 1982-11-02 Procede d'annulation adaptive d'echos dans la transmission en duplex d'informations numeriques, et dispositif permettant l'execution de ce procede

Publications (2)

Publication Number Publication Date
DK306483D0 DK306483D0 (da) 1983-07-01
DK306483A true DK306483A (da) 1983-07-01

Family

ID=20344930

Family Applications (1)

Application Number Title Priority Date Filing Date
DK306483A DK306483A (da) 1981-11-02 1983-07-01 Fremgangsmaade til at frembringe adaptiv ekko-eliminering ved overfoersel af digital information i duplex samt apparat til udoevelse af fremgangsmaaden

Country Status (19)

Country Link
US (1) US4539674A (fr)
EP (1) EP0092570B1 (fr)
JP (1) JPS58501850A (fr)
KR (1) KR860002211B1 (fr)
AU (1) AU553372B2 (fr)
BR (1) BR8207953A (fr)
CA (2) CA1205876A (fr)
DE (1) DE3265650D1 (fr)
DK (1) DK306483A (fr)
ES (1) ES516965A0 (fr)
FI (1) FI74561C (fr)
IE (1) IE53759B1 (fr)
IT (1) IT1153338B (fr)
MX (1) MX152441A (fr)
MY (1) MY8600355A (fr)
NO (1) NO157238C (fr)
SE (1) SE426764B (fr)
WO (1) WO1983001716A1 (fr)
YU (1) YU244082A (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE434789B (sv) * 1982-12-21 1984-08-13 Ellemtel Utvecklings Ab Forfarande for detektering av farliga linjespenningar over en tvatradig linje
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
JPS59151546A (ja) * 1983-02-18 1984-08-30 Nec Corp 適応形反響消去装置
DE3327467A1 (de) * 1983-07-29 1985-02-14 Siemens AG, 1000 Berlin und 8000 München Verfahren und schaltungsanordnung zur kompensation von echosignalen
US4707824A (en) * 1983-12-15 1987-11-17 Nec Corporation Method and apparatus for cancelling echo
SE441052B (sv) * 1984-02-01 1985-09-02 Ellemtel Utvecklings Ab Forfarande for att testa funktionen hos en anordning for adaptiv ekoeliminering
IT1178913B (it) * 1984-03-26 1987-09-16 Cselt Centro Studi Lab Telecom Sistema per la trassmissione bidire zionale con cancellazione d eco
US4672665A (en) * 1984-07-27 1987-06-09 Matsushita Electric Industrial Co. Ltd. Echo canceller
US4989221A (en) * 1987-03-30 1991-01-29 Codex Corporation Sample rate converter
US5062102A (en) * 1988-12-01 1991-10-29 Nec Corporation Echo canceller with means for determining filter coefficients from autocorrelation and cross-correlation coefficients
US5852661A (en) * 1995-02-17 1998-12-22 Advanced Micro Devices, Inc. Adaptive echo cancellation used with echo suppression to reduce short and long duration echoes
US6965578B1 (en) * 1998-09-30 2005-11-15 Conexant Systems, Inc. Echo canceling method and apparatus for digital data communication system

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2277470A1 (fr) * 1974-07-03 1976-01-30 Cit Alcatel Dispositif de centrage d'un filtre transversal d'un annuleur d'echo
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
AU514263B2 (en) * 1977-01-17 1981-01-29 T.R.T. Digital echo canceller
DE2729109A1 (de) * 1977-06-28 1979-01-11 Siemens Ag Schaltungsanordnung zur kompensation von echos in nichtsynchronen traegerfrequenzsystemen
US4268727A (en) * 1979-03-14 1981-05-19 International Telephone And Telegraph Corporation Adaptive digital echo cancellation circuit
US4425483A (en) * 1981-10-13 1984-01-10 Northern Telecom Limited Echo cancellation using transversal filters

Also Published As

Publication number Publication date
NO832420L (no) 1983-07-01
MY8600355A (en) 1986-12-31
YU244082A (en) 1985-04-30
EP0092570A1 (fr) 1983-11-02
MX152441A (es) 1985-07-15
EP0092570B1 (fr) 1985-08-21
AU9122282A (en) 1983-05-18
AU553372B2 (en) 1986-07-10
KR860002211B1 (ko) 1986-12-31
CA1205876A (fr) 1986-06-10
ES8402483A1 (es) 1984-01-16
DE3265650D1 (en) 1985-09-26
DK306483D0 (da) 1983-07-01
KR840002785A (ko) 1984-07-16
JPS58501850A (ja) 1983-10-27
IE53759B1 (en) 1989-02-01
FI74561C (sv) 1988-02-08
ES516965A0 (es) 1984-01-16
FI832228L (fi) 1983-06-17
IE822605L (en) 1983-05-02
BR8207953A (pt) 1983-10-04
FI832228A0 (fi) 1983-06-17
US4539674A (en) 1985-09-03
IT1153338B (it) 1987-01-14
IT8224025A1 (it) 1984-05-02
WO1983001716A1 (fr) 1983-05-11
IT8224025A0 (it) 1982-11-02
FI74561B (fi) 1987-10-30
CA1191224A (fr) 1985-07-30
NO157238C (no) 1988-02-10
SE426764B (sv) 1983-02-07
NO157238B (no) 1987-11-02

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