IT1153338B - 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 - Google Patents

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

Info

Publication number
IT1153338B
IT1153338B IT24025/82A IT2402582A IT1153338B IT 1153338 B IT1153338 B IT 1153338B IT 24025/82 A IT24025/82 A IT 24025/82A IT 2402582 A IT2402582 A IT 2402582A IT 1153338 B IT1153338 B IT 1153338B
Authority
IT
Italy
Prior art keywords
eco
cancellation
realization
transmission
equipment
Prior art date
Application number
IT24025/82A
Other languages
English (en)
Other versions
IT8224025A0 (it
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 IT8224025A0 publication Critical patent/IT8224025A0/it
Application granted granted Critical
Publication of IT1153338B publication Critical patent/IT1153338B/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
    • 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)
  • Analogue/Digital Conversion (AREA)
  • Bidirectional Digital Transmission (AREA)
IT24025/82A 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 IT1153338B (it)

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 (2)

Publication Number Publication Date
IT8224025A0 IT8224025A0 (it) 1982-11-02
IT1153338B true IT1153338B (it) 1987-01-14

Family

ID=20344930

Family Applications (1)

Application Number Title Priority Date Filing Date
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

Country Status (19)

Country Link
US (1) US4539674A (it)
EP (1) EP0092570B1 (it)
JP (1) JPS58501850A (it)
KR (1) KR860002211B1 (it)
AU (1) AU553372B2 (it)
BR (1) BR8207953A (it)
CA (2) CA1205876A (it)
DE (1) DE3265650D1 (it)
DK (1) DK306483D0 (it)
ES (1) ES8402483A1 (it)
FI (1) FI74561C (it)
IE (1) IE53759B1 (it)
IT (1) IT1153338B (it)
MX (1) MX152441A (it)
MY (1) MY8600355A (it)
NO (1) NO157238C (it)
SE (1) SE426764B (it)
WO (1) WO1983001716A1 (it)
YU (1) YU244082A (it)

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
AU614447B2 (en) * 1988-12-01 1991-08-29 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
NL7800408A (nl) * 1977-01-17 1978-07-19 Trt Telecom Radio Electr Digitale echocompensator voor een modem voor datatransmissie met behulp van modulatie van een draaggolf.
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
CA1173128A (en) * 1981-10-13 1984-08-21 Pok F. Lee Echo cancellation using transversal filters

Also Published As

Publication number Publication date
MX152441A (es) 1985-07-15
IE822605L (en) 1983-05-02
CA1205876A (en) 1986-06-10
BR8207953A (pt) 1983-10-04
JPS58501850A (ja) 1983-10-27
NO832420L (no) 1983-07-01
EP0092570A1 (en) 1983-11-02
WO1983001716A1 (en) 1983-05-11
ES516965A0 (es) 1984-01-16
FI74561B (fi) 1987-10-30
SE426764B (sv) 1983-02-07
DK306483A (da) 1983-07-01
DK306483D0 (da) 1983-07-01
FI832228A0 (fi) 1983-06-17
AU9122282A (en) 1983-05-18
ES8402483A1 (es) 1984-01-16
CA1191224A (en) 1985-07-30
KR840002785A (ko) 1984-07-16
NO157238C (no) 1988-02-10
MY8600355A (en) 1986-12-31
NO157238B (no) 1987-11-02
IT8224025A0 (it) 1982-11-02
EP0092570B1 (en) 1985-08-21
IE53759B1 (en) 1989-02-01
YU244082A (en) 1985-04-30
KR860002211B1 (ko) 1986-12-31
AU553372B2 (en) 1986-07-10
FI832228L (fi) 1983-06-17
US4539674A (en) 1985-09-03
DE3265650D1 (en) 1985-09-26
FI74561C (sv) 1988-02-08

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Legal Events

Date Code Title Description
TA Fee payment date (situation as of event date), data collected since 19931001

Effective date: 19971103