GB2139054B - Loudspeaking telephone instruments - Google Patents

Loudspeaking telephone instruments

Info

Publication number
GB2139054B
GB2139054B GB08410334A GB8410334A GB2139054B GB 2139054 B GB2139054 B GB 2139054B GB 08410334 A GB08410334 A GB 08410334A GB 8410334 A GB8410334 A GB 8410334A GB 2139054 B GB2139054 B GB 2139054B
Authority
GB
United Kingdom
Prior art keywords
telephone instruments
loudspeaking telephone
loudspeaking
instruments
telephone
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
GB08410334A
Other versions
GB8410334D0 (en
GB2139054A (en
Inventor
John Winston Kidd
Peter James Mackwell
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.)
General Electric Co PLC
Original Assignee
General Electric Co PLC
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 GB838310947A external-priority patent/GB8310947D0/en
Application filed by General Electric Co PLC filed Critical General Electric Co PLC
Priority to GB08410334A priority Critical patent/GB2139054B/en
Publication of GB8410334D0 publication Critical patent/GB8410334D0/en
Publication of GB2139054A publication Critical patent/GB2139054A/en
Application granted granted Critical
Publication of GB2139054B publication Critical patent/GB2139054B/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
    • H04M9/10—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic with switching of direction of transmission by voice frequency
    • 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)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Telephone Function (AREA)
GB08410334A 1983-04-22 1984-04-19 Loudspeaking telephone instruments Expired GB2139054B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08410334A GB2139054B (en) 1983-04-22 1984-04-19 Loudspeaking telephone instruments

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB838310947A GB8310947D0 (en) 1983-04-22 1983-04-22 Loudspeaking telephone instruments
GB08410334A GB2139054B (en) 1983-04-22 1984-04-19 Loudspeaking telephone instruments

Publications (3)

Publication Number Publication Date
GB8410334D0 GB8410334D0 (en) 1984-05-31
GB2139054A GB2139054A (en) 1984-10-31
GB2139054B true GB2139054B (en) 1986-09-24

Family

ID=26285910

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08410334A Expired GB2139054B (en) 1983-04-22 1984-04-19 Loudspeaking telephone instruments

Country Status (1)

Country Link
GB (1) GB2139054B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2159375A (en) * 1984-05-19 1985-11-27 Advance Electronic Prod Interrupt on priority communication systems

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1030881B (en) * 1973-12-10 1979-04-10 Cit Alcatel SEMI SUPPRESSOR OF ECO FOR A TERMINAL OF A FOUR WIRE POWER LINE
US3942116A (en) * 1975-03-13 1976-03-02 California Microwave, Inc. Transceiver having improved voice actuated carrier and echo suppression circuit
FR2363247A1 (en) * 1976-08-24 1978-03-24 Cit Alcatel TERMINAL EQUIPMENT FOR A MULTIPLEX TELEPHONE SYSTEM WITH CARRIER CURRENTS
FR2380612A1 (en) * 1977-02-09 1978-09-08 Thomson Csf SPEECH SIGNAL DISCRIMINATION DEVICE AND ALTERNATION SYSTEM INCLUDING SUCH A DEVICE
GB2113054A (en) * 1981-12-21 1983-07-27 Voice Microsystems Ltd Speech detector

Also Published As

Publication number Publication date
GB8410334D0 (en) 1984-05-31
GB2139054A (en) 1984-10-31

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee