GB656959A - Improvements relating to voice frequency oscillator-calling devices - Google Patents

Improvements relating to voice frequency oscillator-calling devices

Info

Publication number
GB656959A
GB656959A GB1316/49A GB131649A GB656959A GB 656959 A GB656959 A GB 656959A GB 1316/49 A GB1316/49 A GB 1316/49A GB 131649 A GB131649 A GB 131649A GB 656959 A GB656959 A GB 656959A
Authority
GB
United Kingdom
Prior art keywords
frequency
valve
currents
rectified
rel
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
GB1316/49A
Other languages
English (en)
Inventor
Lucien Dorbec
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.)
Societe Anonyme de Telecommunications SAT
Original Assignee
Societe Anonyme de Telecommunications SAT
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 Societe Anonyme de Telecommunications SAT filed Critical Societe Anonyme de Telecommunications SAT
Publication of GB656959A publication Critical patent/GB656959A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
    • H04Q1/446—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency
    • H04Q1/4465—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency the same frequency being used for all signalling information, e.g. A.C. nr.9 system

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Telephonic Communication Services (AREA)
GB1316/49A 1948-01-28 1949-01-17 Improvements relating to voice frequency oscillator-calling devices Expired GB656959A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR820021X 1948-01-28

Publications (1)

Publication Number Publication Date
GB656959A true GB656959A (en) 1951-09-05

Family

ID=9269810

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1316/49A Expired GB656959A (en) 1948-01-28 1949-01-17 Improvements relating to voice frequency oscillator-calling devices

Country Status (4)

Country Link
BE (1) BE486823A (fr)
DE (1) DE820021C (fr)
FR (1) FR1006528A (fr)
GB (1) GB656959A (fr)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE745228C (de) * 1939-07-28 1944-03-01 Siemens Ag Elektrischer Signalempfaenger

Also Published As

Publication number Publication date
BE486823A (fr)
FR1006528A (fr) 1952-04-24
DE820021C (de) 1951-11-08

Similar Documents

Publication Publication Date Title
GB553225A (en) Power line telephone system
GB656959A (en) Improvements relating to voice frequency oscillator-calling devices
US2883474A (en) Transistor gating circuit
GB691741A (en) Improvements in or relating to alternating current signalling receivers
GB499103A (en) Alternating current signalling systems
GB541731A (en) Improvements in and relating to telephone and like systems
GB723061A (en) Improvements in or relating to signal receivers
GB660686A (en) Improvements relating to telephone circuit signalling apparatus
GB704922A (en) Improvements in or relating to voice frequency signal receivers
GB726240A (en) Improvements in and relating to high frequency communication systems
GB638930A (en) Improvements in and relating to radio and intercommunication apparatus and systems
US1898118A (en) Signaling system
GB670358A (en) Improvements in or relating to calling arrangements for telecommunication systems
GB676792A (en) Carrier current signalling system
GB487488A (en) Improvements in signal receiving apparatus for telephone systems
GB570283A (en) Improved radio wave trans-receivers
GB525470A (en) Improvements in and relating to thermionic valve circuits
GB482743A (en) Improvements in and relating to electric communication systems
GB604877A (en) Method and means for the transmission of low frequency calls in telecommunication systems
GB1178693A (en) Improvements in or relating to Carrier Telephony Equipment
GB434448A (en) Improvements in or relating to thermionic relay circuits, with special reference to long distance telephony
GB710600A (en) Improvements in or relating to voice frequency signalling system
GB498362A (en) Improvements relating to telephone systems
GB716912A (en) Improvements in or relating to a device, for the amplification of so called voice and signalling voltages, for radio or telephony purposes
GB668629A (en) Improvements in alternating current signalling systems