GB1477413A - Half-echo suppressor for a four-wire line terminal - Google Patents

Half-echo suppressor for a four-wire line terminal

Info

Publication number
GB1477413A
GB1477413A GB5322574A GB5322574A GB1477413A GB 1477413 A GB1477413 A GB 1477413A GB 5322574 A GB5322574 A GB 5322574A GB 5322574 A GB5322574 A GB 5322574A GB 1477413 A GB1477413 A GB 1477413A
Authority
GB
United Kingdom
Prior art keywords
detector
signal
mode
transmit
channel
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.)
Expired
Application number
GB5322574A
Other languages
English (en)
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.)
Alcatel CIT SA
Nokia Inc
Original Assignee
Compagnie Industrielle de Telecommunication CIT Alcatel SA
Nokia 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
Priority claimed from FR7343928A external-priority patent/FR2254159A1/fr
Priority claimed from FR7437705A external-priority patent/FR2291653A2/fr
Application filed by Compagnie Industrielle de Telecommunication CIT Alcatel SA, Nokia Inc filed Critical Compagnie Industrielle de Telecommunication CIT Alcatel SA
Publication of GB1477413A publication Critical patent/GB1477413A/en
Expired 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)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Telephonic Communication Services (AREA)
GB5322574A 1973-12-10 1974-12-09 Half-echo suppressor for a four-wire line terminal Expired GB1477413A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7343928A FR2254159A1 (en) 1973-12-10 1973-12-10 Echo suppressor for terminal station - designed for four-wire telephone line with transmission cct. having controllable gate
FR7437705A FR2291653A2 (fr) 1974-11-15 1974-11-15 Demi-suppresseur d'echo pour un terminal d'une ligne electrique a quatre fils

Publications (1)

Publication Number Publication Date
GB1477413A true GB1477413A (en) 1977-06-22

Family

ID=26218070

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5322574A Expired GB1477413A (en) 1973-12-10 1974-12-09 Half-echo suppressor for a four-wire line terminal

Country Status (7)

Country Link
US (1) US3985979A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
JP (1) JPS5433086B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE2457876C3 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB1477413A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
IT (1) IT1030881B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
NL (1) NL7416090A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
SE (1) SE407319B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2137055A (en) * 1983-03-12 1984-09-26 Marconi Avionics Voice Communication System
GB2139054A (en) * 1983-04-22 1984-10-31 Gen Electric Co Plc Loudspeaking telephone instruments

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2363247A1 (fr) * 1976-08-24 1978-03-24 Cit Alcatel Equipement terminal pour un systeme multiplex telephonique a courants porteurs
FR2404969A1 (fr) * 1977-10-03 1979-04-27 Cit Alcatel Demi-suppresseur d'echo pour une ligne telephonique a quatre fils
US4165449A (en) * 1978-01-03 1979-08-21 Storage Technology Corporation Echo suppressor circuit
US4192979A (en) * 1978-06-27 1980-03-11 Communications Satellite Corporation Apparatus for controlling echo in communication systems utilizing a voice-activated switch
US4215252A (en) * 1978-09-27 1980-07-29 Communications Satellite Corporation Video teleconference audio echo control unit
CA1137240A (en) * 1980-09-09 1982-12-07 Northern Telecom Limited Method of and apparatus for echo detection in voice channel signals
ES2113320B1 (es) * 1996-05-30 1999-01-16 Alcatel Standard Electrica Dispositivo supresor del eco.

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3280274A (en) * 1963-10-30 1966-10-18 Bell Telephone Labor Inc Echo suppressor for communication systems having extended transmission delays
US3351720A (en) * 1964-08-31 1967-11-07 Bell Telephone Labor Inc Echo suppressor for communication system having transmission delay
DE1816153B2 (de) * 1968-12-20 1971-04-15 Schaltungsanordnung zur echounterdrueckung in einem sprech kreis auf einem vierdraht uebertragungssystem bei einem uebergang auf einen zweidrahtuebertragungsweg
US3673355A (en) * 1970-09-02 1972-06-27 Bell Telephone Labor Inc Common control digital echo suppression
US3896273A (en) * 1971-01-08 1975-07-22 Communications Satellite Corp Digital echo suppressor
US3823275A (en) * 1972-08-10 1974-07-09 Bell Telephone Labor Inc Common control digital echo suppressor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2137055A (en) * 1983-03-12 1984-09-26 Marconi Avionics Voice Communication System
GB2139054A (en) * 1983-04-22 1984-10-31 Gen Electric Co Plc Loudspeaking telephone instruments

Also Published As

Publication number Publication date
NL7416090A (nl) 1975-06-12
DE2457876A1 (de) 1975-06-12
DE2457876C3 (de) 1981-06-04
US3985979A (en) 1976-10-12
SE407319B (sv) 1979-03-19
JPS5433086B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1979-10-18
IT1030881B (it) 1979-04-10
JPS5092014A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1975-07-23
DE2457876B2 (de) 1980-08-14
SE7415394L (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1975-06-11

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19921209