DK142009C - - Google Patents

Info

Publication number
DK142009C
DK142009C DK412374A DK412374A DK142009C DK 142009 C DK142009 C DK 142009C DK 412374 A DK412374 A DK 412374A DK 412374 A DK412374 A DK 412374A DK 142009 C DK142009 C DK 142009C
Authority
DK
Denmark
Application number
DK412374A
Other languages
Danish (da)
Other versions
DK142009B (da
DK412374A (xx
Inventor
M Lienard
E Penicaud
Original Assignee
Compagnie Industrielle Des Telecommunications Cit-Alcatel
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 Compagnie Industrielle Des Telecommunications Cit-Alcatel filed Critical Compagnie Industrielle Des Telecommunications Cit-Alcatel
Publication of DK412374A publication Critical patent/DK412374A/da
Publication of DK142009B publication Critical patent/DK142009B/da
Application granted granted Critical
Publication of DK142009C publication Critical patent/DK142009C/da

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)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
DK412374AA 1973-08-08 1974-08-01 Kobling til frembringelse af et neutraliseringssignal til en ekkoundertrykkelseskreds. DK142009B (da)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7329024 1973-08-08
FR7329024A FR2240583B1 (xx) 1973-08-08 1973-08-08

Publications (3)

Publication Number Publication Date
DK412374A DK412374A (xx) 1975-04-14
DK142009B DK142009B (da) 1980-08-04
DK142009C true DK142009C (xx) 1980-12-22

Family

ID=9123770

Family Applications (1)

Application Number Title Priority Date Filing Date
DK412374AA DK142009B (da) 1973-08-08 1974-08-01 Kobling til frembringelse af et neutraliseringssignal til en ekkoundertrykkelseskreds.

Country Status (9)

Country Link
US (1) US3935403A (xx)
JP (1) JPS5814098B2 (xx)
BE (1) BE818120A (xx)
DE (1) DE2437873C2 (xx)
DK (1) DK142009B (xx)
FR (1) FR2240583B1 (xx)
GB (1) GB1445773A (xx)
IT (1) IT1025029B (xx)
NL (1) NL7410699A (xx)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3979559A (en) * 1974-01-31 1976-09-07 Milgo Electronics Corporation Data modem having line verification and automatic disconnect features
FR2394213A1 (fr) * 1977-06-10 1979-01-05 Cit Alcatel Dispositif pour la reconnaissance d'une frequence dans un signal code en mic
JPS558120A (en) * 1978-06-30 1980-01-21 Nec Corp Tone detection device
US4352962A (en) * 1980-06-27 1982-10-05 Reliance Electric Company Tone responsive disabling circuit
US4394767A (en) * 1981-07-07 1983-07-19 General Datacomm Industries, Inc. Data transmission over long distance circuits
FR2517499A1 (fr) * 1981-11-27 1983-06-03 Cit Alcatel Procede et dispositif de detection de signaux de donnees et de signalisation sur une voie telephonique
JPS60121856A (ja) * 1983-12-06 1985-06-29 Nec Corp 単一周波数信号検出回路
JPS62181497U (xx) * 1986-05-12 1987-11-18
US4920567A (en) * 1986-07-03 1990-04-24 Motorola, Inc. Secure telephone terminal
US6052462A (en) * 1997-07-10 2000-04-18 Tellabs Operations, Inc. Double talk detection and echo control circuit

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3069501A (en) * 1958-08-20 1962-12-18 Bell Telephone Labor Inc Transmission control in two-way signaling systems
US3647993A (en) * 1970-05-18 1972-03-07 Wescom Tone disabler
US3783194A (en) * 1972-11-20 1974-01-01 Milgo Electronic Corp Data modem having a fast turn-around time over direct distance dialed networks

Also Published As

Publication number Publication date
GB1445773A (en) 1976-08-11
NL7410699A (nl) 1975-02-11
DK142009B (da) 1980-08-04
FR2240583A1 (xx) 1975-03-07
DE2437873A1 (de) 1975-02-20
JPS5814098B2 (ja) 1983-03-17
JPS5046208A (xx) 1975-04-24
FR2240583B1 (xx) 1976-11-12
DK412374A (xx) 1975-04-14
BE818120A (fr) 1975-01-27
DE2437873C2 (de) 1983-08-18
US3935403A (en) 1976-01-27
IT1025029B (it) 1978-08-10

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Legal Events

Date Code Title Description
PBP Patent lapsed