GB726906A - Improvements in or relating to tone generators for telecommunication systems - Google Patents

Improvements in or relating to tone generators for telecommunication systems

Info

Publication number
GB726906A
GB726906A GB377652A GB377652A GB726906A GB 726906 A GB726906 A GB 726906A GB 377652 A GB377652 A GB 377652A GB 377652 A GB377652 A GB 377652A GB 726906 A GB726906 A GB 726906A
Authority
GB
United Kingdom
Prior art keywords
feb
emitter
collector
producing
relating
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
GB377652A
Other languages
English (en)
Inventor
Frederick Harry Bray
Ronald George Knight
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.)
STC PLC
Original Assignee
Standard Telephone and Cables 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 to BE519944D priority Critical patent/BE519944A/xx
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB377652A priority patent/GB726906A/en
Publication of GB726906A publication Critical patent/GB726906A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
GB377652A 1952-02-13 1952-02-13 Improvements in or relating to tone generators for telecommunication systems Expired GB726906A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
BE519944D BE519944A (cg-RX-API-DMAC10.html) 1952-02-13
GB377652A GB726906A (en) 1952-02-13 1952-02-13 Improvements in or relating to tone generators for telecommunication systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB377652A GB726906A (en) 1952-02-13 1952-02-13 Improvements in or relating to tone generators for telecommunication systems

Publications (1)

Publication Number Publication Date
GB726906A true GB726906A (en) 1955-03-23

Family

ID=9764704

Family Applications (1)

Application Number Title Priority Date Filing Date
GB377652A Expired GB726906A (en) 1952-02-13 1952-02-13 Improvements in or relating to tone generators for telecommunication systems

Country Status (2)

Country Link
BE (1) BE519944A (cg-RX-API-DMAC10.html)
GB (1) GB726906A (cg-RX-API-DMAC10.html)

Also Published As

Publication number Publication date
BE519944A (cg-RX-API-DMAC10.html)

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