JPS644193A - Automatic measuring device for luminance signal level of composite video signal - Google Patents

Automatic measuring device for luminance signal level of composite video signal

Info

Publication number
JPS644193A
JPS644193A JP15766187A JP15766187A JPS644193A JP S644193 A JPS644193 A JP S644193A JP 15766187 A JP15766187 A JP 15766187A JP 15766187 A JP15766187 A JP 15766187A JP S644193 A JPS644193 A JP S644193A
Authority
JP
Japan
Prior art keywords
composite video
video signal
circuit
output
measuring device
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
JP15766187A
Other languages
Japanese (ja)
Inventor
Kazuyoshi Miyashita
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP15766187A priority Critical patent/JPS644193A/en
Publication of JPS644193A publication Critical patent/JPS644193A/en
Pending legal-status Critical Current

Links

Landscapes

  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)

Abstract

PURPOSE:To measure a signal level at a high speed with a small scale circuit by sampling a composite video signal at a prescribed frequency, applying A/D conversion to the result, adding four consecutive digital data and evaluating the data except lower 2 bits. CONSTITUTION:A composite video signal from a measurement object device 1 is inputted to an A/D conversion circuit 3 via a buffer circuit 2, sampled by a frequency 4 times the chrominance subcarrier frequency and A/D-converted. The output is inputted to an adder circuit 5 via an input register 4 to add four consecutive digital data. The output of the adder circuit 5 is introduced via an addition result register 6 and output register 7 to evaluate the data the low-order 2 bits of the sum.
JP15766187A 1987-06-26 1987-06-26 Automatic measuring device for luminance signal level of composite video signal Pending JPS644193A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15766187A JPS644193A (en) 1987-06-26 1987-06-26 Automatic measuring device for luminance signal level of composite video signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15766187A JPS644193A (en) 1987-06-26 1987-06-26 Automatic measuring device for luminance signal level of composite video signal

Publications (1)

Publication Number Publication Date
JPS644193A true JPS644193A (en) 1989-01-09

Family

ID=15654611

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15766187A Pending JPS644193A (en) 1987-06-26 1987-06-26 Automatic measuring device for luminance signal level of composite video signal

Country Status (1)

Country Link
JP (1) JPS644193A (en)

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