JPS57125516A - Detection circuit for pulse period - Google Patents

Detection circuit for pulse period

Info

Publication number
JPS57125516A
JPS57125516A JP1204381A JP1204381A JPS57125516A JP S57125516 A JPS57125516 A JP S57125516A JP 1204381 A JP1204381 A JP 1204381A JP 1204381 A JP1204381 A JP 1204381A JP S57125516 A JPS57125516 A JP S57125516A
Authority
JP
Japan
Prior art keywords
period
timer
input pulse
tref
shorter
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
JP1204381A
Other languages
Japanese (ja)
Inventor
Takeya Tanaka
Shigeru Hamada
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP1204381A priority Critical patent/JPS57125516A/en
Publication of JPS57125516A publication Critical patent/JPS57125516A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/02—Measuring characteristics of individual pulses, e.g. deviation from pulse flatness, rise time or duration
    • G01R29/027—Indicating that a pulse characteristic is either above or below a predetermined value or within or beyond a predetermined range of values
    • G01R29/0273—Indicating that a pulse characteristic is either above or below a predetermined value or within or beyond a predetermined range of values the pulse characteristic being duration, i.e. width (indicating that frequency of pulses is above or below a certain limit)

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Manipulation Of Pulses (AREA)

Abstract

PURPOSE:To easily detect pulse period with a simple circuit, by comparing and detecting a pulse period of an input pulse train and a reference pulse width set at a retriggerable timer with an FF circuit. CONSTITUTION:When the period of an input pulse train is longer than a refference period, a retriggerable timer 1 triggers the rise of an input pulse Tn-1 and the timer output becomes 1 from 0 at a certain time. Since no trigger is given during a period T1 by the timer 1, the output changes 1-0 after a reference time Tref. Thus, the timer output is 0 at the next input pulse Tn, 0 is stored in an FF3 to inform T1>Tref. If the period of input pulse train is shorter than the reference period, since the timer 1 is retriggered at a shorter period than the period Tref, the timer output remains logical 1. Thus, 1 is stored in the FF3 to inform that the input pulse period is shorter than the reference period Tref.
JP1204381A 1981-01-29 1981-01-29 Detection circuit for pulse period Pending JPS57125516A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1204381A JPS57125516A (en) 1981-01-29 1981-01-29 Detection circuit for pulse period

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1204381A JPS57125516A (en) 1981-01-29 1981-01-29 Detection circuit for pulse period

Publications (1)

Publication Number Publication Date
JPS57125516A true JPS57125516A (en) 1982-08-04

Family

ID=11794561

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1204381A Pending JPS57125516A (en) 1981-01-29 1981-01-29 Detection circuit for pulse period

Country Status (1)

Country Link
JP (1) JPS57125516A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59216317A (en) * 1983-05-24 1984-12-06 Koko Res Kk Monostable multivibrator
JPS601036U (en) * 1983-06-13 1985-01-07 株式会社ユ−シン Pulse number discrimination circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59216317A (en) * 1983-05-24 1984-12-06 Koko Res Kk Monostable multivibrator
JPS601036U (en) * 1983-06-13 1985-01-07 株式会社ユ−シン Pulse number discrimination circuit

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