SE426764B - Forfarande att astadkomma adaptiv ekoeliminering vid overforing av digital information i duplex jemte anordning for utforande av forfarandet - Google Patents

Forfarande att astadkomma adaptiv ekoeliminering vid overforing av digital information i duplex jemte anordning for utforande av forfarandet

Info

Publication number
SE426764B
SE426764B SE8106444A SE8106444A SE426764B SE 426764 B SE426764 B SE 426764B SE 8106444 A SE8106444 A SE 8106444A SE 8106444 A SE8106444 A SE 8106444A SE 426764 B SE426764 B SE 426764B
Authority
SE
Sweden
Prior art keywords
signal
value
sign
balance filter
reference level
Prior art date
Application number
SE8106444A
Other languages
English (en)
Swedish (sv)
Inventor
T Svensson
B Carlqvist
Original Assignee
Ellemtel Utvecklings Ab
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 Ellemtel Utvecklings Ab filed Critical Ellemtel Utvecklings Ab
Priority to SE8106444A priority Critical patent/SE426764B/sv
Priority to CA000414386A priority patent/CA1205876A/en
Priority to MX195004A priority patent/MX152441A/es
Priority to ES516965A priority patent/ES516965A0/es
Priority to IE2605/82A priority patent/IE53759B1/en
Priority to YU02440/82A priority patent/YU244082A/xx
Priority to CA000414564A priority patent/CA1191224A/en
Priority to AU91222/82A priority patent/AU553372B2/en
Priority to US06/514,825 priority patent/US4539674A/en
Priority to DE8282903352T priority patent/DE3265650D1/de
Priority to PCT/SE1982/000363 priority patent/WO1983001716A1/en
Priority to IT24025/82A priority patent/IT1153338B/it
Priority to JP82503355A priority patent/JPS58501850A/ja
Priority to EP82903352A priority patent/EP0092570B1/en
Priority to BR8207953A priority patent/BR8207953A/pt
Priority to KR8204929A priority patent/KR860002211B1/ko
Publication of SE426764B publication Critical patent/SE426764B/sv
Priority to FI832228A priority patent/FI74561C/sv
Priority to NO83832420A priority patent/NO157238C/no
Priority to DK306483A priority patent/DK306483A/da
Priority to MY355/86A priority patent/MY8600355A/xx

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
    • 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)
SE8106444A 1981-11-02 1981-11-02 Forfarande att astadkomma adaptiv ekoeliminering vid overforing av digital information i duplex jemte anordning for utforande av forfarandet SE426764B (sv)

Priority Applications (20)

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
CA000414386A CA1205876A (en) 1981-11-02 1982-10-28 Fir-type balance filter incorporated in the transmitter-receiver unit in a telecommunication system
MX195004A MX152441A (es) 1981-11-02 1982-10-29 Mejoras en aparato para cancelacion de eco en la transmision de la informacion numerica doble para un sistema de telecomunicaciones
ES516965A ES516965A0 (es) 1981-11-02 1982-10-29 Metodo y aparato para proporcionar cancelacion adaptable de ecos en un sistema de telecomunicacion.
IE2605/82A IE53759B1 (en) 1981-11-02 1982-10-29 Method of providing adaptive echo cancellation in transmission of digital information in duplex, and apparatus for performing the method
YU02440/82A YU244082A (en) 1981-11-02 1982-11-01 Method and arrangement for adaptive cancelling of echo at duplex data reception
CA000414564A CA1191224A (en) 1981-11-02 1982-11-01 Method of providing adaptive echo cancellation in transmission of digital information in duplex, and apparatus for performing the method
DE8282903352T DE3265650D1 (en) 1981-11-02 1982-11-02 Method of providing adaptive echo cancellation in transmission of digital information in duplex, and apparatus for performing the method
BR8207953A BR8207953A (pt) 1981-11-02 1982-11-02 Processo de proporcionar supressao de ecos auto-adaptativo na transmissao de informacoes digitais em duplex,e aparelho para realizacao do processo
AU91222/82A AU553372B2 (en) 1981-11-02 1982-11-02 Method of providing adaptive echo cancellation in transmission of digital information in duplex , and apparatusfor performing the method
PCT/SE1982/000363 WO1983001716A1 (en) 1981-11-02 1982-11-02 Method of providing adaptive echo cancellation in transmission of digital information in duplex, and apparatus for performing the method
IT24025/82A IT1153338B (it) 1981-11-02 1982-11-02 Metodo per provvedere la cancellazione di adattamento di eco-segnali nella trasmissione di informazioni digitali in duplex e apparecchiatura per la realizzazione di detto metodo
JP82503355A JPS58501850A (ja) 1981-11-02 1982-11-02 二重通信のデイジタル情報の伝送において適応的エコ−消去を与える方法とこの方法を実行する装置
EP82903352A EP0092570B1 (en) 1981-11-02 1982-11-02 Method of providing adaptive echo cancellation in transmission of digital information in duplex, and apparatus for performing the method
US06/514,825 US4539674A (en) 1981-11-02 1982-11-02 Method of providing adaptive echo cancellation in transmission of digital information in duplex, and apparatus for performing the method
KR8204929A KR860002211B1 (ko) 1981-11-02 1982-11-02 2중통신의 디지틀 정보의 전송에 있어서 적절한 반향소거를 제공하는 방법과 이 방법을 실행하는 장치
FI832228A FI74561C (sv) 1981-11-02 1983-06-17 Förfarande att åstadkomma adaptiv ekoeliminering vid överföring av dig ital information i duplex jämte anordning för utförande av förfarandet
NO83832420A NO157238C (no) 1981-11-02 1983-07-01 Fremgangsmaate for aa tilveiebringe adaptiv ekko-eliminasjon ved transmisjon av digital informasjon i dupleks, samt apparat for gjenomfoering av fremgangsmaaten.
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
MY355/86A MY8600355A (en) 1981-11-02 1986-12-30 Method of providing adaptive echo cancellation in transmission of digital information in duplex, and apparatus for performing the method

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
SE426764B true SE426764B (sv) 1983-02-07

Family

ID=20344930

Family Applications (1)

Application Number Title Priority Date Filing Date
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

Country Status (19)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1985003607A1 (en) * 1984-02-01 1985-08-15 Telefonaktiebolaget L M Ericsson Method to test the function of an adaptive echo canceller

Families Citing this family (11)

* 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
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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1985003607A1 (en) * 1984-02-01 1985-08-15 Telefonaktiebolaget L M Ericsson Method to test the function of an adaptive echo canceller

Also Published As

Publication number Publication date
NO832420L (no) 1983-07-01
MY8600355A (en) 1986-12-31
YU244082A (en) 1985-04-30
EP0092570A1 (en) 1983-11-02
MX152441A (es) 1985-07-15
EP0092570B1 (en) 1985-08-21
AU9122282A (en) 1983-05-18
AU553372B2 (en) 1986-07-10
KR860002211B1 (ko) 1986-12-31
CA1205876A (en) 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
DK306483A (da) 1983-07-01
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 (en) 1983-05-11
IT8224025A0 (it) 1982-11-02
FI74561B (fi) 1987-10-30
CA1191224A (en) 1985-07-30
NO157238C (no) 1988-02-10
NO157238B (no) 1987-11-02

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