JPS574525A - Synchronous circuit - Google Patents

Synchronous circuit

Info

Publication number
JPS574525A
JPS574525A JP7833880A JP7833880A JPS574525A JP S574525 A JPS574525 A JP S574525A JP 7833880 A JP7833880 A JP 7833880A JP 7833880 A JP7833880 A JP 7833880A JP S574525 A JPS574525 A JP S574525A
Authority
JP
Japan
Prior art keywords
synchronizing signal
counter
output
light
picture
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
JP7833880A
Other languages
Japanese (ja)
Inventor
Yuji Tanaka
Nobuyoshi Akiyama
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP7833880A priority Critical patent/JPS574525A/en
Publication of JPS574525A publication Critical patent/JPS574525A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
    • G01J1/44—Electric circuits

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Abstract

PURPOSE:To enable a periodically fluctuating light to be accurately measured, in a digital photometry, by forming a synchronizing signal from the periodically fluctuating light. CONSTITUTION:The light from a TV picture surface 1 is photoelectrically converted 4 through an optical chopper 2, smoothed 6, V/F-converted 7 and counted 9 through gate 8 to obtain a picture data. The opening and closing positions of the chopper 2 are detected 15, and said detection signals are differentiated 17 and 18 to from an trigger signal for a mono-stable oscillator 20. The output thereof is used to reset the counter 9 and a synchronizing signal counter 12. The output of a TV picture synchronizing signal detector 10 is shaped 11 into a square wave and counted 12. Said count value is decoded 13 to trigger an FF14. The output thereof is applied to the AND gate 8. Accordingly, the light pulse component synchronized with the TV synchronizing signal is applied to the counter 9.
JP7833880A 1980-06-12 1980-06-12 Synchronous circuit Pending JPS574525A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7833880A JPS574525A (en) 1980-06-12 1980-06-12 Synchronous circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7833880A JPS574525A (en) 1980-06-12 1980-06-12 Synchronous circuit

Publications (1)

Publication Number Publication Date
JPS574525A true JPS574525A (en) 1982-01-11

Family

ID=13659188

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7833880A Pending JPS574525A (en) 1980-06-12 1980-06-12 Synchronous circuit

Country Status (1)

Country Link
JP (1) JPS574525A (en)

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