JPS5631260A - Call signal receiving system - Google Patents

Call signal receiving system

Info

Publication number
JPS5631260A
JPS5631260A JP10714879A JP10714879A JPS5631260A JP S5631260 A JPS5631260 A JP S5631260A JP 10714879 A JP10714879 A JP 10714879A JP 10714879 A JP10714879 A JP 10714879A JP S5631260 A JPS5631260 A JP S5631260A
Authority
JP
Japan
Prior art keywords
call signal
signal
potential
receiving circuit
comparing
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.)
Granted
Application number
JP10714879A
Other languages
Japanese (ja)
Other versions
JPS6028197B2 (en
Inventor
Akihiko Suzuki
Kensaku Yoshizawa
Mamoru Nozawa
Minoru Sasai
Masaaki Kato
Koji Suzuki
Setsuo Oshima
Shuichi Nishimuta
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.)
HASEGAWA DENKI SEISAKUSHO KK
NAKAYO TSUSHINKI KK
Meisei Electric Co Ltd
NEC Platforms Ltd
Iwatsu Electric Co Ltd
Nippon Telegraph and Telephone Corp
Taiko Electric Works Ltd
Kanda Tsushin Kogyo Co Ltd
Nakayo Telecommunications Inc
Original Assignee
HASEGAWA DENKI SEISAKUSHO KK
NAKAYO TSUSHINKI KK
Meisei Electric Co Ltd
Iwatsu Electric Co Ltd
Nippon Telegraph and Telephone Corp
Taiko Electric Works Ltd
Kanda Tsushin Kogyo Co Ltd
Nakayo Telecommunications Inc
Nitsuko 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 HASEGAWA DENKI SEISAKUSHO KK, NAKAYO TSUSHINKI KK, Meisei Electric Co Ltd, Iwatsu Electric Co Ltd, Nippon Telegraph and Telephone Corp, Taiko Electric Works Ltd, Kanda Tsushin Kogyo Co Ltd, Nakayo Telecommunications Inc, Nitsuko Corp filed Critical HASEGAWA DENKI SEISAKUSHO KK
Priority to JP54107148A priority Critical patent/JPS6028197B2/en
Publication of JPS5631260A publication Critical patent/JPS5631260A/en
Publication of JPS6028197B2 publication Critical patent/JPS6028197B2/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
    • H04M19/04—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)

Abstract

PURPOSE:To make it possible to make the receiving circuit high-impedance, by comparing the DC potential, which is obtained by rectifying and smoothing the received call signal, with the required number of reference potentials to decide the operation or the nonoperation of the receiving circuit. CONSTITUTION:Potential change which is transmitted from the key telephone set and corresponds to each of the service state, the holding state, and the on-hook state is transmitted through control line 11. Voltage comparing circuit 60 detects these states by comparing this potential change with plural reference potentials set previously. The call signal coming from trunk line service line 10 is smoothed and rectified by rectifier 43, capacitor 45, and so on and is input to voltage comparator 46 to obtain an incoming signal synchronized with the call signal, and this signal is used as the control signal of tone ringer sound. Consequently, the receiving circuit can be high-impedance because change of the DC potential obtained by smoothing and rectifying the call signal is detected.
JP54107148A 1979-08-24 1979-08-24 Calling signal reception method Expired JPS6028197B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP54107148A JPS6028197B2 (en) 1979-08-24 1979-08-24 Calling signal reception method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54107148A JPS6028197B2 (en) 1979-08-24 1979-08-24 Calling signal reception method

Publications (2)

Publication Number Publication Date
JPS5631260A true JPS5631260A (en) 1981-03-30
JPS6028197B2 JPS6028197B2 (en) 1985-07-03

Family

ID=14451721

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54107148A Expired JPS6028197B2 (en) 1979-08-24 1979-08-24 Calling signal reception method

Country Status (1)

Country Link
JP (1) JPS6028197B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60183140A (en) * 1984-02-27 1985-09-18 毛　振基 Laminated plastic tile and manufacture thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60183140A (en) * 1984-02-27 1985-09-18 毛　振基 Laminated plastic tile and manufacture thereof

Also Published As

Publication number Publication date
JPS6028197B2 (en) 1985-07-03

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