FI74845B - Anordning foer grundinstaellning av en ekoeliminator. - Google Patents

Anordning foer grundinstaellning av en ekoeliminator. Download PDF

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Publication number
FI74845B
FI74845B FI824217A FI824217A FI74845B FI 74845 B FI74845 B FI 74845B FI 824217 A FI824217 A FI 824217A FI 824217 A FI824217 A FI 824217A FI 74845 B FI74845 B FI 74845B
Authority
FI
Finland
Prior art keywords
outputs
input
output
setting device
inputs
Prior art date
Application number
FI824217A
Other languages
English (en)
Finnish (fi)
Other versions
FI824217L (fi
FI74845C (sv
FI824217A0 (fi
Inventor
De Verdiere Jean-Marc Ma Colin
Patrice Rene Langlois
Original Assignee
Telecommunications Sa
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 Telecommunications Sa filed Critical Telecommunications Sa
Publication of FI824217A0 publication Critical patent/FI824217A0/fi
Publication of FI824217L publication Critical patent/FI824217L/fi
Publication of FI74845B publication Critical patent/FI74845B/fi
Application granted granted Critical
Publication of FI74845C publication Critical patent/FI74845C/sv

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
    • H04B3/238—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)
  • Telephonic Communication Services (AREA)
  • Hardware Redundancy (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
  • Bidirectional Digital Transmission (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Claims (2)

1. System för ekoeliminering innefattande en ekoelimina-tor (5)» grundinstallningsanordning (6), vara första utgängar anslutits till ekoeliminatorns (5) första ingängar och vars minst en andra utg&ng anslutits till ekoeliminatorns (5) minst en andra utg&ng, en pseudoslumpsekvensgenerator (7), vars utg&ng (u^) anslutits till grundinställningsanordningens (6) en första ing&ng, en differenskrets (2) vars ingäng anslutits ätminstone till grundinställningsanordningens (6) nämnda andra utg&ng, samt en subtraktionskrets (3) vars ena ingäng anslutits till differenskretsens (2) utg&ng och andra ingäng till ekoeliminatorns (2) utgäng och vars utgäng anslutits till grundinställningsanordningens (6) andra ingäng, varvid grundinställningsanordningen (6) innehäller till generatorn (7) anslutna organ (61) för transformering av sekvensen (u ) till en kö av sampel (e ), som härleds ur u genom for- k k mein e = a (2U -1), kännetecknat av att det i grund- instäl^ningsanordningen ingär ett första skiftregister (62) vars ingäng anslutits tili transformeringsorganens (61) utg&ng, ett andra skiftregister (63) vars ingängar anslutits tili utg&ngarna p& det första registret (62), multiplikatorer (64) vilkas ingängar anslutits tili subtraktionskretsens utgäng och utgängarna pä det andra registret (63), samt summe-ringskretsar (66), vars ingängar anslutits bäde tili multi-plikatorernas (62) utgängar och tili de tredje registrens (65) utgängar, varvid utg&ngarna pä summeringskretsarna (66) anslutits tili varje motsvarande ingäng pä det tredje registret (65) och varvid de tredje registren innehäller de för ekoeli-mineringen använda initialfaktorerna multiplicerade med en konstant.
2. System för ekoeliminering innefattande en ekoelimina-tor (10), grundinstallningsanordning (8) vars första utgängar anslutits tili ekoeliminatorns (10) första ingängar och vars minst tvä andra utgängar anslutits tili ekoeliminatorns (10) minst tvä andra ingängar, en pseudoslumpsekvensgenerator (7)
FI824217A 1981-12-09 1982-12-08 Anordning för grundinställning av en ekoeliminator. FI74845C (sv)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8122984 1981-12-09
FR8122984A FR2517905B1 (fr) 1981-12-09 1981-12-09 Dispositif d'initialisation pour annuleur d'echo et son application aux echos lointains

Publications (4)

Publication Number Publication Date
FI824217A0 FI824217A0 (fi) 1982-12-08
FI824217L FI824217L (fi) 1983-06-10
FI74845B true FI74845B (fi) 1987-11-30
FI74845C FI74845C (sv) 1988-03-10

Family

ID=9264821

Family Applications (1)

Application Number Title Priority Date Filing Date
FI824217A FI74845C (sv) 1981-12-09 1982-12-08 Anordning för grundinställning av en ekoeliminator.

Country Status (12)

Country Link
US (1) US4578544A (sv)
EP (1) EP0081437B1 (sv)
JP (1) JPS58114534A (sv)
CA (1) CA1208733A (sv)
DE (1) DE3275799D1 (sv)
DK (1) DK545682A (sv)
ES (1) ES517955A0 (sv)
FI (1) FI74845C (sv)
FR (1) FR2517905B1 (sv)
HU (1) HU186186B (sv)
NO (1) NO156628C (sv)
SU (1) SU1308208A3 (sv)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4669116A (en) * 1982-12-09 1987-05-26 Regents Of The University Of California Non-linear echo cancellation of data signals
US4715064A (en) * 1984-06-22 1987-12-22 Ncr Corporation Adaptive hybrid circuit
GB8427165D0 (en) * 1984-10-26 1984-12-05 British Telecomm Adaptive recognising device
NZ214905A (en) * 1985-01-29 1988-09-29 British Telecomm Noise cancellation by adaptive filter compensates for timing variations
US4811342A (en) * 1985-11-12 1989-03-07 Racal Data Communications Inc. High speed analog echo canceller
EP0333718B1 (en) * 1986-10-01 1992-06-03 Racal-Datacom Inc. Echo canceller with adaptive dynamically positioned taps
US4805215A (en) * 1986-10-01 1989-02-14 Racal Data Communications Inc. Adaptive echo canceller with sparse dynamically positioned taps
EP0272714B1 (en) * 1986-11-17 1992-06-24 Alcatel N.V. Adjustable echo canceller
US4813073A (en) * 1987-07-02 1989-03-14 Codex Corporation Echo cancellation
FR2618925B1 (fr) * 1987-07-30 1989-12-15 Rault Jean Dispositif de calcul numerique pour installation de transmission de donnees en code 2b 1q ou analogue
US5065242A (en) * 1990-06-29 1991-11-12 General Electric Company Deghosting apparatus using pseudorandom sequences
JPH0527019U (ja) * 1991-09-19 1993-04-06 俊子 阿曽 保冷帽子
FR2682252B1 (fr) * 1991-10-04 1995-11-03 Prescom Sarl Procede de traitement de signal et dispositif de prise et de restitution de son mettant en óoeuvre ce procede.
FR2713417B1 (fr) * 1993-12-02 1996-02-02 Europ Agence Spatiale Procédé de réglage adaptatif d'un suppresseur d'écho.
US5920548A (en) * 1996-10-01 1999-07-06 Telefonaktiebolaget L M Ericsson Echo path delay estimation
CA2415363C (en) * 2000-07-11 2006-01-24 Samsung Electronics Co., Ltd. Repetitive-pn1023-sequence echo-cancellation reference signal for single-carrier digital television broadcast systems
US7881460B2 (en) * 2005-11-17 2011-02-01 Microsoft Corporation Configuration of echo cancellation
US20070112563A1 (en) * 2005-11-17 2007-05-17 Microsoft Corporation Determination of audio device quality

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2795865A (en) * 1954-03-29 1957-06-18 Backiel Mary Protective foot covering
US3735055A (en) * 1971-11-05 1973-05-22 Bell Telephone Labor Inc Method for improving the settling time of a transversal filter adaptive echo canceller
US3795865A (en) * 1972-02-23 1974-03-05 Honeywell Inf Systems Automated real time equalized modem
FR2337465A1 (fr) * 1975-12-30 1977-07-29 Ibm France Procede et dispositif pour determiner les valeurs initiales des coefficients d'un egaliseur transversal complexe
AU514263B2 (en) * 1977-01-17 1981-01-29 T.R.T. Digital echo canceller
FR2460075B1 (fr) * 1979-06-22 1988-12-09 Cit Alcatel Annuleur d'echo adaptatif pour transmission de donnees en duplex
NL7905577A (nl) * 1979-07-18 1981-01-20 Philips Nv Inrichting met een niet-recursieffilter.
CA1173128A (en) * 1981-10-13 1984-08-21 Pok F. Lee Echo cancellation using transversal filters

Also Published As

Publication number Publication date
FI824217L (fi) 1983-06-10
DK545682A (da) 1983-06-10
US4578544A (en) 1986-03-25
NO156628C (no) 1987-10-21
FR2517905A1 (fr) 1983-06-10
NO156628B (no) 1987-07-13
DE3275799D1 (en) 1987-04-23
SU1308208A3 (ru) 1987-04-30
JPS58114534A (ja) 1983-07-07
FR2517905B1 (fr) 1985-11-29
HU186186B (en) 1985-06-28
FI74845C (sv) 1988-03-10
CA1208733A (en) 1986-07-29
FI824217A0 (fi) 1982-12-08
EP0081437A1 (fr) 1983-06-15
ES8308663A1 (es) 1983-09-16
NO824130L (no) 1983-06-10
ES517955A0 (es) 1983-09-16
EP0081437B1 (fr) 1987-03-18

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Owner name: SOCIETE ANONYME DE TELECOMMUNICATIONS