JPS57140021A - Signal detecting circuit - Google Patents

Signal detecting circuit

Info

Publication number
JPS57140021A
JPS57140021A JP56025844A JP2584481A JPS57140021A JP S57140021 A JPS57140021 A JP S57140021A JP 56025844 A JP56025844 A JP 56025844A JP 2584481 A JP2584481 A JP 2584481A JP S57140021 A JPS57140021 A JP S57140021A
Authority
JP
Japan
Prior art keywords
signal
time
output
tau2
tau1
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
JP56025844A
Other languages
Japanese (ja)
Inventor
Hisashi Nakamura
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 JP56025844A priority Critical patent/JPS57140021A/en
Publication of JPS57140021A publication Critical patent/JPS57140021A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
    • H03K5/153—Arrangements in which a pulse is delivered at the instant when a predetermined characteristic of an input signal is present or at a fixed time interval after this instant

Abstract

PURPOSE:To obtain a required signal detection without lowering a noise margin, by providing a comprator comparing an input signal with a reference level, a monostable multivibrator possible for retriggering and a binary counter. CONSTITUTION:A comparator 3 compares a level of a signal input (a) with a reference level (b), and outputs a binary signal (c) corresponding to the result of comparison. A monostable multivibrator 4 keeps an on-state for a time tau1 when the input IN changes from ''0'' to ''1''. Since the output of the comparator 3 changes from ''0'' to ''1'' after a time tau2 (tau1>tau2) after it changes from ''0'' to ''1'', the keeping time of on-state of the monostable multivibrator 4, that is, the time when an output (d) keeps the state of ''0'', is tau2+tau1. While the (d) is at ''0'', the clearing of a binary counter 5 is released and the counter 5 counts clocks inputted from a clock input terminal 7. When an output QN at the N-th stage goes to ''1'' at time tau3, ''1'' is given to a signal detecting output terminal 9 and the detection of signal is informed to an external circuit.
JP56025844A 1981-02-24 1981-02-24 Signal detecting circuit Pending JPS57140021A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56025844A JPS57140021A (en) 1981-02-24 1981-02-24 Signal detecting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56025844A JPS57140021A (en) 1981-02-24 1981-02-24 Signal detecting circuit

Publications (1)

Publication Number Publication Date
JPS57140021A true JPS57140021A (en) 1982-08-30

Family

ID=12177151

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56025844A Pending JPS57140021A (en) 1981-02-24 1981-02-24 Signal detecting circuit

Country Status (1)

Country Link
JP (1) JPS57140021A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63292821A (en) * 1987-05-26 1988-11-30 Nec Corp Pulse cut-off detection circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63292821A (en) * 1987-05-26 1988-11-30 Nec Corp Pulse cut-off detection circuit

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