JPS5714243A - Detecting circuit for ringing signal - Google Patents

Detecting circuit for ringing signal

Info

Publication number
JPS5714243A
JPS5714243A JP8941380A JP8941380A JPS5714243A JP S5714243 A JPS5714243 A JP S5714243A JP 8941380 A JP8941380 A JP 8941380A JP 8941380 A JP8941380 A JP 8941380A JP S5714243 A JPS5714243 A JP S5714243A
Authority
JP
Japan
Prior art keywords
ringing signal
circuit
output
level
logical circuit
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
JP8941380A
Other languages
Japanese (ja)
Inventor
Kenji Meguro
Yoshinori Yoshida
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP8941380A priority Critical patent/JPS5714243A/en
Publication of JPS5714243A publication Critical patent/JPS5714243A/en
Pending 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

Abstract

PURPOSE:To miniaturize a detecting circuit and to improve its detection precision by converting an AC ringing signal into a rectification output with the level of a digital logical circuit and by achieving the detection by using the count value of a sampling output regarding the conversion output. CONSTITUTION:An Ac ringing signal is converted into a rectification output with the level of a digital logical circuit, and according to the counting value of a sampling output regarding the conversion, the existence of the ringing signal, a ringing signal frequency, a ringing signal period, etc., are detected. For example, when a forward current flows through the light emitting diode 13 of a converting circuit 10 for the digital logical circuit level, the phototransistor 17 of a photocoupler 12 outputs a digital signal with the digital logical circuit level. This output is led to a digital logical circuit 19 and the sampling output of a sampling gate 21 is checked by a counting circuit 23 and frequency checking timing circuit 24.
JP8941380A 1980-06-30 1980-06-30 Detecting circuit for ringing signal Pending JPS5714243A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8941380A JPS5714243A (en) 1980-06-30 1980-06-30 Detecting circuit for ringing signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8941380A JPS5714243A (en) 1980-06-30 1980-06-30 Detecting circuit for ringing signal

Publications (1)

Publication Number Publication Date
JPS5714243A true JPS5714243A (en) 1982-01-25

Family

ID=13969952

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8941380A Pending JPS5714243A (en) 1980-06-30 1980-06-30 Detecting circuit for ringing signal

Country Status (1)

Country Link
JP (1) JPS5714243A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5957593A (en) * 1982-09-27 1984-04-03 Nec Corp Receiving system of calling signal
JPS6158395A (en) * 1984-08-30 1986-03-25 Fujitsu Ltd Incomming detecting method
JPS63151144A (en) * 1986-12-15 1988-06-23 Matsushita Electric Ind Co Ltd Incoming call detector

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5957593A (en) * 1982-09-27 1984-04-03 Nec Corp Receiving system of calling signal
JPS6158395A (en) * 1984-08-30 1986-03-25 Fujitsu Ltd Incomming detecting method
JPH0453158B2 (en) * 1984-08-30 1992-08-25 Fujitsu Kk
JPS63151144A (en) * 1986-12-15 1988-06-23 Matsushita Electric Ind Co Ltd Incoming call detector

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