JPH0432580B2 - - Google Patents

Info

Publication number
JPH0432580B2
JPH0432580B2 JP57215706A JP21570682A JPH0432580B2 JP H0432580 B2 JPH0432580 B2 JP H0432580B2 JP 57215706 A JP57215706 A JP 57215706A JP 21570682 A JP21570682 A JP 21570682A JP H0432580 B2 JPH0432580 B2 JP H0432580B2
Authority
JP
Japan
Prior art keywords
circuit
voltage
signal
detection circuit
detection
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 - Lifetime
Application number
JP57215706A
Other languages
English (en)
Japanese (ja)
Other versions
JPS59105742A (ja
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 filed Critical
Priority to JP21570682A priority Critical patent/JPS59105742A/ja
Publication of JPS59105742A publication Critical patent/JPS59105742A/ja
Publication of JPH0432580B2 publication Critical patent/JPH0432580B2/ja
Granted 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)
JP21570682A 1982-12-09 1982-12-09 呼出信号検出回路 Granted JPS59105742A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21570682A JPS59105742A (ja) 1982-12-09 1982-12-09 呼出信号検出回路

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21570682A JPS59105742A (ja) 1982-12-09 1982-12-09 呼出信号検出回路

Publications (2)

Publication Number Publication Date
JPS59105742A JPS59105742A (ja) 1984-06-19
JPH0432580B2 true JPH0432580B2 (fr) 1992-05-29

Family

ID=16676808

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21570682A Granted JPS59105742A (ja) 1982-12-09 1982-12-09 呼出信号検出回路

Country Status (1)

Country Link
JP (1) JPS59105742A (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59178851A (ja) * 1983-03-30 1984-10-11 Toshiba Corp 電話機回路
JPH03211946A (ja) * 1990-01-16 1991-09-17 Tenshiyou Denki Kogyo Kk 端末設備呼出信号の検出方法
ATE427585T1 (de) * 2005-07-01 2009-04-15 Senstronic S A Induktiver anwesenheits-, naherungs- oder positionssensor

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57129563A (en) * 1981-02-04 1982-08-11 Ricoh Co Ltd Call signal detector

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57129563A (en) * 1981-02-04 1982-08-11 Ricoh Co Ltd Call signal detector

Also Published As

Publication number Publication date
JPS59105742A (ja) 1984-06-19

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