GB690720A - Improvements in two-way loudspeaker telephone installations - Google Patents

Improvements in two-way loudspeaker telephone installations

Info

Publication number
GB690720A
GB690720A GB21086/51A GB2108651A GB690720A GB 690720 A GB690720 A GB 690720A GB 21086/51 A GB21086/51 A GB 21086/51A GB 2108651 A GB2108651 A GB 2108651A GB 690720 A GB690720 A GB 690720A
Authority
GB
United Kingdom
Prior art keywords
valve
feed
sept
anode
valves
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
GB21086/51A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB690720A publication Critical patent/GB690720A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
GB21086/51A 1950-09-06 1951-09-06 Improvements in two-way loudspeaker telephone installations Expired GB690720A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1024329T 1950-09-06

Publications (1)

Publication Number Publication Date
GB690720A true GB690720A (en) 1953-04-29

Family

ID=9578766

Family Applications (1)

Application Number Title Priority Date Filing Date
GB21086/51A Expired GB690720A (en) 1950-09-06 1951-09-06 Improvements in two-way loudspeaker telephone installations

Country Status (5)

Country Link
BE (1) BE505491A (enrdf_load_stackoverflow)
CH (1) CH305270A (enrdf_load_stackoverflow)
FR (2) FR1024329A (enrdf_load_stackoverflow)
GB (1) GB690720A (enrdf_load_stackoverflow)
LU (1) LU30955A1 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1129543B (de) * 1958-06-25 1962-05-17 Gylling & Co Ab Schaltungsanordnung fuer sprachgesteuerte Wechselsprechanlagen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1129543B (de) * 1958-06-25 1962-05-17 Gylling & Co Ab Schaltungsanordnung fuer sprachgesteuerte Wechselsprechanlagen

Also Published As

Publication number Publication date
FR1024329A (fr) 1953-03-31
CH305270A (fr) 1955-02-15
LU30955A1 (enrdf_load_stackoverflow)
BE505491A (enrdf_load_stackoverflow)
FR61954E (fr) 1955-06-01

Similar Documents

Publication Publication Date Title
GB533626A (en) Electron discharge device amplifying circuits
GB690720A (en) Improvements in two-way loudspeaker telephone installations
GB732630A (en) Improvements in or relating to negative feedback amplifiers
GB989329A (en) Electrical amplifying circuits
GB662677A (en) Phase inverter system
GB643471A (en) Improvements in thermionic valve gating circuits
GB799094A (en) Fast-switching transistor telegraph repeater
GB574626A (en) Improvements in or relating to electric amplifying circuits
GB389970A (en) Improvements in electric signalling circuits with thermionic valves
GB923428A (en) Circuit arrangement for controlling the amplification in a transistor amplifier stage
GB453574A (en) Improvements in and relating to valve amplifiers of electrical signals
GB509613A (en) Improvements in electric signal amplifiers incorporating voice-operated devices
GB668370A (en) An improved signalling-current amplifying arrangement for two-wire telephone lines
GB403540A (en) Valve repeater circuits for telephony
GB513678A (en) Improvements in loud-speaking telephone circuit arrangements
GB917689A (en) Improved amplifying, impedance changing or level-changing apparatus
GB771945A (en) Improvements in or relating to transistor amplifiers
GB456827A (en) Improvements in or relating to two-way telephone transmission systems or repeaters
GB465464A (en) Improvements in or relating to the control of variable attenuation of networks for alternating signalling or like systems
GB1420115A (en) Ac voltage signal amplivying arrangement
GB683319A (en) Improvements in or relating to thermionic valve amplifiers
GB573793A (en) Amplifying arrangement using saturable bore reactors
GB786706A (en) Improvements in or relating to push-pull amplifiers
GB147756A (en) Improvements in telephone and the like systems
GB1044461A (en) Improvements in and relating to transistor amplifiers