FR2305071A1 - Dispositif de suppression d'echo dans un systeme de transmission permettant la concentration du trafic - Google Patents

Dispositif de suppression d'echo dans un systeme de transmission permettant la concentration du trafic

Info

Publication number
FR2305071A1
FR2305071A1 FR7602999A FR7602999A FR2305071A1 FR 2305071 A1 FR2305071 A1 FR 2305071A1 FR 7602999 A FR7602999 A FR 7602999A FR 7602999 A FR7602999 A FR 7602999A FR 2305071 A1 FR2305071 A1 FR 2305071A1
Authority
FR
France
Prior art keywords
traffic
concentration
transmission system
suppression device
system allowing
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.)
Granted
Application number
FR7602999A
Other languages
English (en)
Other versions
FR2305071B1 (fr
Inventor
Paul Abramson
Ulrich Appel
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.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
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 International Business Machines Corp filed Critical International Business Machines Corp
Publication of FR2305071A1 publication Critical patent/FR2305071A1/fr
Application granted granted Critical
Publication of FR2305071B1 publication Critical patent/FR2305071B1/fr
Granted 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Telephonic Communication Services (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
  • Time-Division Multiplex Systems (AREA)
FR7602999A 1975-03-20 1976-01-29 Dispositif de suppression d'echo dans un systeme de transmission permettant la concentration du trafic Granted FR2305071A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/560,423 US4005276A (en) 1975-03-20 1975-03-20 Digital voice signaling with digital echo detection and voice activity compression used to cancel echo

Publications (2)

Publication Number Publication Date
FR2305071A1 true FR2305071A1 (fr) 1976-10-15
FR2305071B1 FR2305071B1 (fr) 1979-02-02

Family

ID=24237762

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7602999A Granted FR2305071A1 (fr) 1975-03-20 1976-01-29 Dispositif de suppression d'echo dans un systeme de transmission permettant la concentration du trafic

Country Status (6)

Country Link
US (1) US4005276A (fr)
JP (1) JPS51114011A (fr)
CA (1) CA1066824A (fr)
DE (1) DE2608575C2 (fr)
FR (1) FR2305071A1 (fr)
GB (1) GB1530634A (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4100377A (en) * 1977-04-28 1978-07-11 Bell Telephone Laboratories, Incorporated Packet transmission of speech
JPS53142115A (en) * 1977-05-18 1978-12-11 Fujitsu Ltd Antisinging system
FR2451676A1 (fr) * 1979-03-12 1980-10-10 Soumagne Joel Detecteur d'echo notamment pour systeme de communication a interpolation de parole
US4295217A (en) * 1979-12-28 1981-10-13 Ibm Corporation Apparatus to reduce the effect of a mid-talkspurt freeze-out
US4652703A (en) * 1983-03-01 1987-03-24 Racal Data Communications Inc. Digital voice transmission having improved echo suppression
US4609788A (en) * 1983-03-01 1986-09-02 Racal Data Communications Inc. Digital voice transmission having improved echo suppression
JPH06101683B2 (ja) * 1983-03-14 1994-12-12 株式会社日立製作所 デイジタルアナログ変換装置
JPS601939A (ja) * 1983-06-17 1985-01-08 Hitachi Ltd Ｐｃｍ伝送システム
US6223154B1 (en) * 1998-07-31 2001-04-24 Motorola, Inc. Using vocoded parameters in a staggered average to provide speakerphone operation based on enhanced speech activity thresholds
US7263074B2 (en) * 1999-12-09 2007-08-28 Broadcom Corporation Voice activity detection based on far-end and near-end statistics

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1520546A (fr) * 1966-05-05 1968-04-12 Sits Soc It Telecom Siemens Système de transmission de signaux téléphoniques à allocation dans le temps

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2958733A (en) * 1958-12-23 1960-11-01 Bell Telephone Labor Inc Transmission control in a two way communication system
US3046347A (en) * 1959-02-25 1962-07-24 Bell Telephone Labor Inc Transmission control in a two way communication system
US3562448A (en) * 1968-06-21 1971-02-09 Bell Telephone Labor Inc Common control digital echo suppression
US3673355A (en) * 1970-09-02 1972-06-27 Bell Telephone Labor Inc Common control digital echo suppression
US3821494A (en) * 1972-07-14 1974-06-28 Ibm Digital echo suppressor with direct table look up control by delta coded signals
US3823275A (en) * 1972-08-10 1974-07-09 Bell Telephone Labor Inc Common control digital echo suppressor

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1520546A (fr) * 1966-05-05 1968-04-12 Sits Soc It Telecom Siemens Système de transmission de signaux téléphoniques à allocation dans le temps

Also Published As

Publication number Publication date
GB1530634A (en) 1978-11-01
DE2608575C2 (de) 1982-05-27
DE2608575A1 (de) 1976-09-30
CA1066824A (fr) 1979-11-20
JPS51114011A (en) 1976-10-07
FR2305071B1 (fr) 1979-02-02
US4005276A (en) 1977-01-25

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Legal Events

Date Code Title Description
ST Notification of lapse