JPS53147416A - Superimposing system for signal tone - Google Patents

Superimposing system for signal tone

Info

Publication number
JPS53147416A
JPS53147416A JP6123477A JP6123477A JPS53147416A JP S53147416 A JPS53147416 A JP S53147416A JP 6123477 A JP6123477 A JP 6123477A JP 6123477 A JP6123477 A JP 6123477A JP S53147416 A JPS53147416 A JP S53147416A
Authority
JP
Japan
Prior art keywords
signal tone
superimposing system
superimposing
signal
tone
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.)
Pending
Application number
JP6123477A
Other languages
Japanese (ja)
Inventor
Shiro Enami
Takuji Mukaemachi
Naohiko Yasui
Akira Kikuchi
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.)
Hitachi Ltd
Nippon Telegraph and Telephone Corp
Original Assignee
Hitachi Ltd
Nippon Telegraph and Telephone Corp
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 Hitachi Ltd, Nippon Telegraph and Telephone Corp filed Critical Hitachi Ltd
Priority to JP6123477A priority Critical patent/JPS53147416A/en
Publication of JPS53147416A publication Critical patent/JPS53147416A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/02—Calling substations, e.g. by ringing

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)

Abstract

PURPOSE:To superimpose signal tone to communication current, by driving transistors in a constant current circuit with a signal tone frequency.
JP6123477A 1977-05-27 1977-05-27 Superimposing system for signal tone Pending JPS53147416A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6123477A JPS53147416A (en) 1977-05-27 1977-05-27 Superimposing system for signal tone

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6123477A JPS53147416A (en) 1977-05-27 1977-05-27 Superimposing system for signal tone

Publications (1)

Publication Number Publication Date
JPS53147416A true JPS53147416A (en) 1978-12-22

Family

ID=13165319

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6123477A Pending JPS53147416A (en) 1977-05-27 1977-05-27 Superimposing system for signal tone

Country Status (1)

Country Link
JP (1) JPS53147416A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03162058A (en) * 1989-11-21 1991-07-12 Tokyo Gas Co Ltd Transmission terminal equipment

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3931474A (en) * 1974-12-30 1976-01-06 Gte Automatic Electric Laboratories Incorporated Tone injection circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3931474A (en) * 1974-12-30 1976-01-06 Gte Automatic Electric Laboratories Incorporated Tone injection circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03162058A (en) * 1989-11-21 1991-07-12 Tokyo Gas Co Ltd Transmission terminal equipment

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