FR2515454A1 - Dispositif de reduction de brouillage - Google Patents

Dispositif de reduction de brouillage Download PDF

Info

Publication number
FR2515454A1
FR2515454A1 FR8217373A FR8217373A FR2515454A1 FR 2515454 A1 FR2515454 A1 FR 2515454A1 FR 8217373 A FR8217373 A FR 8217373A FR 8217373 A FR8217373 A FR 8217373A FR 2515454 A1 FR2515454 A1 FR 2515454A1
Authority
FR
France
Prior art keywords
signal
scrambling
echo
values
reproduction
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.)
Withdrawn
Application number
FR8217373A
Other languages
English (en)
French (fr)
Inventor
Dietrich Anselm Alsberg
Robert Paul Coulter
Thomas H Curtis
Geng-Seng Fang
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.)
AT&T Corp
Original Assignee
Western Electric Co Inc
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 Western Electric Co Inc filed Critical Western Electric Co Inc
Publication of FR2515454A1 publication Critical patent/FR2515454A1/fr
Withdrawn legal-status Critical Current

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
    • H04B3/237—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 two adaptive filters, e.g. for near end and for end echo cancelling
    • 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
    • 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
    • H04B3/234—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 double talk detection
    • 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)
  • Noise Elimination (AREA)
FR8217373A 1981-10-23 1982-10-18 Dispositif de reduction de brouillage Withdrawn FR2515454A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US31449081A 1981-10-23 1981-10-23

Publications (1)

Publication Number Publication Date
FR2515454A1 true FR2515454A1 (fr) 1983-04-29

Family

ID=23220171

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8217373A Withdrawn FR2515454A1 (fr) 1981-10-23 1982-10-18 Dispositif de reduction de brouillage

Country Status (8)

Country Link
JP (1) JPS5881346A (ko)
KR (1) KR840002179A (ko)
AU (1) AU8965682A (ko)
DE (1) DE3238564A1 (ko)
FR (1) FR2515454A1 (ko)
GB (1) GB2109207A (ko)
NL (1) NL8204096A (ko)
SE (1) SE8205839L (ko)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1238381A (en) * 1985-03-14 1988-06-21 Ephraim Arnon Multi-stage echo canceller
US4868874A (en) * 1986-04-18 1989-09-19 Hitachi, Ltd. Echo canceller
AU614447B2 (en) * 1988-12-01 1991-08-29 Nec Corporation Echo canceller with means for determining filter coefficients from autocorrelation and cross-correlation coefficients
US5471527A (en) 1993-12-02 1995-11-28 Dsc Communications Corporation Voice enhancement system and method
US5631899A (en) * 1995-05-31 1997-05-20 Lucent Technologies Inc. Acoustic echo canceler
GB2308283A (en) * 1995-12-16 1997-06-18 Ibm System and method for echo cancellation

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3754105A (en) * 1968-12-20 1973-08-21 W Poschenrieder Circuit arrangement for echo suppression in a voice circuit on a four-wire transmission system upon transfer to a two-wire transmission line
US4282411A (en) * 1979-06-04 1981-08-04 Tellabs, Inc. Residual echo suppressor for echo canceller
DE3116674A1 (de) * 1980-04-28 1982-01-14 Kokusai Denshin Denwa K.K., Tokyo Echo-steuersystem
EP0044598A1 (fr) * 1980-07-21 1982-01-27 Telecommunications Radioelectriques Et Telephoniques T.R.T. Dispositif d'annulation d'un signal d'écho composite

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3754105A (en) * 1968-12-20 1973-08-21 W Poschenrieder Circuit arrangement for echo suppression in a voice circuit on a four-wire transmission system upon transfer to a two-wire transmission line
US4282411A (en) * 1979-06-04 1981-08-04 Tellabs, Inc. Residual echo suppressor for echo canceller
DE3116674A1 (de) * 1980-04-28 1982-01-14 Kokusai Denshin Denwa K.K., Tokyo Echo-steuersystem
EP0044598A1 (fr) * 1980-07-21 1982-01-27 Telecommunications Radioelectriques Et Telephoniques T.R.T. Dispositif d'annulation d'un signal d'écho composite

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS, Conference Record, vol. 3 de 3, Philadelphia, Pa, 13-17 juin 1982, New York (US) *

Also Published As

Publication number Publication date
JPS5881346A (ja) 1983-05-16
AU8965682A (en) 1983-04-28
SE8205839L (sv) 1983-04-24
GB2109207A (en) 1983-05-25
DE3238564A1 (de) 1983-05-05
KR840002179A (ko) 1984-06-11
SE8205839D0 (sv) 1982-10-14
NL8204096A (nl) 1983-05-16

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ST Notification of lapse