JPS5764170A - Zero cross detecting circuit - Google Patents

Zero cross detecting circuit

Info

Publication number
JPS5764170A
JPS5764170A JP14086280A JP14086280A JPS5764170A JP S5764170 A JPS5764170 A JP S5764170A JP 14086280 A JP14086280 A JP 14086280A JP 14086280 A JP14086280 A JP 14086280A JP S5764170 A JPS5764170 A JP S5764170A
Authority
JP
Japan
Prior art keywords
signal
zero cross
waveform
zero
exclusive
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
JP14086280A
Other languages
Japanese (ja)
Inventor
Keizo Ihara
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.)
Teac Corp
Original Assignee
Teac Corp
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 Teac Corp filed Critical Teac Corp
Priority to JP14086280A priority Critical patent/JPS5764170A/en
Publication of JPS5764170A publication Critical patent/JPS5764170A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/175—Indicating the instants of passage of current or voltage through a given value, e.g. passage through zero

Abstract

PURPOSE:To obtain zero detecting pulses of the frequency twice that of the AC waveform used for a tape recorder of an FM recording and reproducing system relatively easily by using a zero cross detector detecting zero crossing, a delay circuit, and logical circuits. CONSTITUTION:When a sinusoidal AC waveform (reproduction FM signal) A is inputted to a comparator 16 by reading data from a tape 11, it is compared with the zero level at the inversion input terminal, and a zero cross detection signal B which is waveform-shaped to a square wave is obtained. This signal B is phase-inverted by an inverter 17, and is delayed by the time T in a delay circuit, whereby an inverted delay signal C is formed. Next, in an exclusive OR circuit 19, the exclusive OR of the signal B and the signal C is determined and an exclusive OR output signal is obtained. This signal D is phase-inverted with an inverter 20, and the zero cross detection pulse E of the frequency twice that of the zero cross of the AC waveform is obtained in synchronization therewith. In this way, the relatively simple circuits are constituted without using any monostable multivibrator.
JP14086280A 1980-10-08 1980-10-08 Zero cross detecting circuit Pending JPS5764170A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14086280A JPS5764170A (en) 1980-10-08 1980-10-08 Zero cross detecting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14086280A JPS5764170A (en) 1980-10-08 1980-10-08 Zero cross detecting circuit

Publications (1)

Publication Number Publication Date
JPS5764170A true JPS5764170A (en) 1982-04-19

Family

ID=15278464

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14086280A Pending JPS5764170A (en) 1980-10-08 1980-10-08 Zero cross detecting circuit

Country Status (1)

Country Link
JP (1) JPS5764170A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105137114A (en) * 2015-07-23 2015-12-09 德惠市北方汽车底盘零部件有限公司 Vehicle speed sensor and negative voltage anti-interference communication system
CN105842527A (en) * 2016-06-08 2016-08-10 江苏现代电力科技股份有限公司 Anti-interference high-precision zero-crossing detection device
KR20160119270A (en) * 2014-03-03 2016-10-12 퀄컴 인코포레이티드 Systems and methods for frequency detection
CN106383264A (en) * 2016-06-08 2017-02-08 江苏现代电力科技股份有限公司 Anti-interference high-precision zero-crossing detection method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160119270A (en) * 2014-03-03 2016-10-12 퀄컴 인코포레이티드 Systems and methods for frequency detection
CN105137114A (en) * 2015-07-23 2015-12-09 德惠市北方汽车底盘零部件有限公司 Vehicle speed sensor and negative voltage anti-interference communication system
CN105842527A (en) * 2016-06-08 2016-08-10 江苏现代电力科技股份有限公司 Anti-interference high-precision zero-crossing detection device
CN106383264A (en) * 2016-06-08 2017-02-08 江苏现代电力科技股份有限公司 Anti-interference high-precision zero-crossing detection method
CN105842527B (en) * 2016-06-08 2018-10-16 江苏现代电力科技股份有限公司 Anti-interference high-precision zero crossing detection device

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