JPS57210782A - Operation circuit for photoelctric converting element with video signal - Google Patents

Operation circuit for photoelctric converting element with video signal

Info

Publication number
JPS57210782A
JPS57210782A JP56095445A JP9544581A JPS57210782A JP S57210782 A JPS57210782 A JP S57210782A JP 56095445 A JP56095445 A JP 56095445A JP 9544581 A JP9544581 A JP 9544581A JP S57210782 A JPS57210782 A JP S57210782A
Authority
JP
Japan
Prior art keywords
inputted
video signal
operation circuit
curve
tip
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.)
Granted
Application number
JP56095445A
Other languages
Japanese (ja)
Other versions
JPS6142471B2 (en
Inventor
Fujio Hayashida
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP56095445A priority Critical patent/JPS57210782A/en
Publication of JPS57210782A publication Critical patent/JPS57210782A/en
Publication of JPS6142471B2 publication Critical patent/JPS6142471B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/16—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Picture Signal Circuits (AREA)
  • Transforming Electric Information Into Light Information (AREA)

Abstract

PURPOSE:To remarkably reduce the effect of a nonlinear distortion of an I-L curve, by clamping the tip of a horizontal synchronizing signal to a certain level on the I-L curve of a photoelectric converting element even if the APL of a video signal is changed. CONSTITUTION:A video signal TV inputted to an input terminal 1 is amplified at an amplifier 3 via a coupling capacitor 2 and inputted to a clamp circuit 13. The tip of a horizontal synchronizing pulse is fixed to a certain level with the clamp circuit 13 and inputted to an operation circuit 4. A part of the output of the clamp circuit is inputted to a comparator 9 via a low pass filter 14. The error outpur of the comparator 9 is averaged with a time constant of a low pass filter 15, inputted to the operation circuit 4 and controls a bias current of a photoelectric conversion element 5. Thus, even if the I-L curve of the conversion element 5 is fluctuated or the APL is fluctuated, the tip of the horizontal synchronizing pulse is set to a current value giving a constant output power at all times.
JP56095445A 1981-06-19 1981-06-19 Operation circuit for photoelctric converting element with video signal Granted JPS57210782A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56095445A JPS57210782A (en) 1981-06-19 1981-06-19 Operation circuit for photoelctric converting element with video signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56095445A JPS57210782A (en) 1981-06-19 1981-06-19 Operation circuit for photoelctric converting element with video signal

Publications (2)

Publication Number Publication Date
JPS57210782A true JPS57210782A (en) 1982-12-24
JPS6142471B2 JPS6142471B2 (en) 1986-09-20

Family

ID=14137883

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56095445A Granted JPS57210782A (en) 1981-06-19 1981-06-19 Operation circuit for photoelctric converting element with video signal

Country Status (1)

Country Link
JP (1) JPS57210782A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0285360U (en) * 1988-12-20 1990-07-04

Also Published As

Publication number Publication date
JPS6142471B2 (en) 1986-09-20

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