JPS62287747A - Signal detection device - Google Patents

Signal detection device

Info

Publication number
JPS62287747A
JPS62287747A JP13236986A JP13236986A JPS62287747A JP S62287747 A JPS62287747 A JP S62287747A JP 13236986 A JP13236986 A JP 13236986A JP 13236986 A JP13236986 A JP 13236986A JP S62287747 A JPS62287747 A JP S62287747A
Authority
JP
Japan
Prior art keywords
current
signal
signal line
noise
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
JP13236986A
Other languages
Japanese (ja)
Inventor
Norio Fujita
Original Assignee
Matsushita Seiko 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 Matsushita Seiko Co Ltd filed Critical Matsushita Seiko Co Ltd
Priority to JP13236986A priority Critical patent/JPS62287747A/en
Publication of JPS62287747A publication Critical patent/JPS62287747A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To prevent a malfunction due to noise by providing a current detecting circuit detecting a signal current outputted from the originating side of a signal line and giving an output when the current is a prescribed current or over so as to exclude the noise given onto the signal line.
CONSTITUTION: In reaching a signal sent from a communication equipment to a signal line 1, a positive signal current is given to the photocoupler 3 of a unidirectional current detecting circuit 100 and a current limit resistor 8. The detected current detecting signal is outputted to a current detection signal line 10 and enters a sum operation circuit 7. The circuit 7 ORs current detection signals and outputs a signal detection signal to a signal detection signal line 12. If a noise voltage is generated in the line 1, a weak current flows to the photocoupler 3 of the circuit 100, since the power enough to generate a light is not obtained, no current detection signal is outputted to the signal line 10. Thus, the noise on the signal line 1 is excluded and the malfunction due to noise is prevented.
COPYRIGHT: (C)1987,JPO&Japio
JP13236986A 1986-06-06 1986-06-06 Signal detection device Pending JPS62287747A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13236986A JPS62287747A (en) 1986-06-06 1986-06-06 Signal detection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13236986A JPS62287747A (en) 1986-06-06 1986-06-06 Signal detection device

Publications (1)

Publication Number Publication Date
JPS62287747A true JPS62287747A (en) 1987-12-14

Family

ID=15079764

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13236986A Pending JPS62287747A (en) 1986-06-06 1986-06-06 Signal detection device

Country Status (1)

Country Link
JP (1) JPS62287747A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01153751U (en) * 1988-04-18 1989-10-23

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01153751U (en) * 1988-04-18 1989-10-23

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