JPS5299008A - Calling signal system - Google Patents

Calling signal system

Info

Publication number
JPS5299008A
JPS5299008A JP1561976A JP1561976A JPS5299008A JP S5299008 A JPS5299008 A JP S5299008A JP 1561976 A JP1561976 A JP 1561976A JP 1561976 A JP1561976 A JP 1561976A JP S5299008 A JPS5299008 A JP S5299008A
Authority
JP
Japan
Prior art keywords
signal system
calling signal
frequency
signal
detected
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
JP1561976A
Other languages
Japanese (ja)
Inventor
Takeo Fukuda
Kazuhiko Hanawa
Kiyoshi Urui
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP1561976A priority Critical patent/JPS5299008A/en
Publication of JPS5299008A publication Critical patent/JPS5299008A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/02—Selecting arrangements for multiplex systems for frequency-division multiplexing

Abstract

PURPOSE:To simplify circuit configuration in a modulated signal circuit exchange system by adapting that the frequency of a calling party is made equal to a carrier frequency, and when arriving of the frequency signal is detected in the line circuit, the line is connected to a calling resistor, and when cut-off of the signal is detected, disposition is made as the end of the speak or giving up at the middle.
JP1561976A 1976-02-16 1976-02-16 Calling signal system Pending JPS5299008A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1561976A JPS5299008A (en) 1976-02-16 1976-02-16 Calling signal system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1561976A JPS5299008A (en) 1976-02-16 1976-02-16 Calling signal system

Publications (1)

Publication Number Publication Date
JPS5299008A true JPS5299008A (en) 1977-08-19

Family

ID=11893715

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1561976A Pending JPS5299008A (en) 1976-02-16 1976-02-16 Calling signal system

Country Status (1)

Country Link
JP (1) JPS5299008A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56102141A (en) * 1980-01-18 1981-08-15 Nec Corp Digital communication device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5075303A (en) * 1973-10-29 1975-06-20

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5075303A (en) * 1973-10-29 1975-06-20

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56102141A (en) * 1980-01-18 1981-08-15 Nec Corp Digital communication device

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