JPS57129563A - Call signal detector - Google Patents

Call signal detector

Info

Publication number
JPS57129563A
JPS57129563A JP1515381A JP1515381A JPS57129563A JP S57129563 A JPS57129563 A JP S57129563A JP 1515381 A JP1515381 A JP 1515381A JP 1515381 A JP1515381 A JP 1515381A JP S57129563 A JPS57129563 A JP S57129563A
Authority
JP
Japan
Prior art keywords
signal
relay
detection
circuit
call signal
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
JP1515381A
Other languages
English (en)
Japanese (ja)
Other versions
JPH0334267B2 (enrdf_load_stackoverflow
Inventor
Takamoto Ishida
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP1515381A priority Critical patent/JPS57129563A/ja
Publication of JPS57129563A publication Critical patent/JPS57129563A/ja
Publication of JPH0334267B2 publication Critical patent/JPH0334267B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/82—Line monitoring circuits for call progress or status discrimination

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
JP1515381A 1981-02-04 1981-02-04 Call signal detector Granted JPS57129563A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1515381A JPS57129563A (en) 1981-02-04 1981-02-04 Call signal detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1515381A JPS57129563A (en) 1981-02-04 1981-02-04 Call signal detector

Publications (2)

Publication Number Publication Date
JPS57129563A true JPS57129563A (en) 1982-08-11
JPH0334267B2 JPH0334267B2 (enrdf_load_stackoverflow) 1991-05-22

Family

ID=11880850

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1515381A Granted JPS57129563A (en) 1981-02-04 1981-02-04 Call signal detector

Country Status (1)

Country Link
JP (1) JPS57129563A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59105742A (ja) * 1982-12-09 1984-06-19 Toshiba Corp 呼出信号検出回路
US4993444A (en) * 1988-02-16 1991-02-19 Mitsubishi Denki Kabushiki Kaisha Dishwasher

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51154111U (enrdf_load_stackoverflow) * 1975-05-31 1976-12-08

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51154111U (enrdf_load_stackoverflow) * 1975-05-31 1976-12-08

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59105742A (ja) * 1982-12-09 1984-06-19 Toshiba Corp 呼出信号検出回路
US4993444A (en) * 1988-02-16 1991-02-19 Mitsubishi Denki Kabushiki Kaisha Dishwasher

Also Published As

Publication number Publication date
JPH0334267B2 (enrdf_load_stackoverflow) 1991-05-22

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