JPS57125855A - Frequency discriminating circuit - Google Patents

Frequency discriminating circuit

Info

Publication number
JPS57125855A
JPS57125855A JP1161781A JP1161781A JPS57125855A JP S57125855 A JPS57125855 A JP S57125855A JP 1161781 A JP1161781 A JP 1161781A JP 1161781 A JP1161781 A JP 1161781A JP S57125855 A JPS57125855 A JP S57125855A
Authority
JP
Japan
Prior art keywords
signal
frequency
supplied
monostable multivibrator
pulse 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.)
Pending
Application number
JP1161781A
Other languages
Japanese (ja)
Inventor
Shintaro Yamamoto
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.)
Chino Works Ltd
Original Assignee
Chino Works 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 Chino Works Ltd filed Critical Chino Works Ltd
Priority to JP1161781A priority Critical patent/JPS57125855A/en
Publication of JPS57125855A publication Critical patent/JPS57125855A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
    • G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
    • G01R23/15—Indicating that frequency of pulses is either above or below a predetermined value or within or outside a predetermined range of values, by making use of non-linear or digital elements (indicating that pulse width is above or below a certain limit)

Landscapes

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

Abstract

PURPOSE:To discriminate two kinds of frequency of an AC signal with a simple circuit, by using a photoisolator and a retriggerrable monostable multivibrator. CONSTITUTION:Periods of two frequencies f1 and f2 of an AC signal supplied to input terminals 11 and 12 are denoted as T1 and T2 respectively, and a width T0 of the output pulse signal of a retriggerrable monostable multivibrator 3 is set to the intermediate value between frequency periods T1 and T2. When an AC signal e1 of the frequency f1 is supplied to input terminal 11 and 12, a photocoupler 2 is turned on for coming of the positive-polarity signal to take out the earth potential and is turned off for coming of the negative-polarity signal to take out a voltage VCC. This pulse signal e2 is supplied to the retriggerable monostable multivibrator 3, and an oscillation pulse signal e3 is outputted from an output terminal 4. Meanwhile, when the AC signal e1 of the frequency f2 is supplied to input terminals 11 and 12, the continuous output signal e3 of a constant level is outputted.
JP1161781A 1981-01-30 1981-01-30 Frequency discriminating circuit Pending JPS57125855A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1161781A JPS57125855A (en) 1981-01-30 1981-01-30 Frequency discriminating circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1161781A JPS57125855A (en) 1981-01-30 1981-01-30 Frequency discriminating circuit

Publications (1)

Publication Number Publication Date
JPS57125855A true JPS57125855A (en) 1982-08-05

Family

ID=11782876

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1161781A Pending JPS57125855A (en) 1981-01-30 1981-01-30 Frequency discriminating circuit

Country Status (1)

Country Link
JP (1) JPS57125855A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017198467A (en) * 2016-04-25 2017-11-02 キヤノン株式会社 Detection circuit, power supply device, and image formation device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017198467A (en) * 2016-04-25 2017-11-02 キヤノン株式会社 Detection circuit, power supply device, and image formation device

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