JPS6423688A - Automatic gain control circuit - Google Patents

Automatic gain control circuit

Info

Publication number
JPS6423688A
JPS6423688A JP17968187A JP17968187A JPS6423688A JP S6423688 A JPS6423688 A JP S6423688A JP 17968187 A JP17968187 A JP 17968187A JP 17968187 A JP17968187 A JP 17968187A JP S6423688 A JPS6423688 A JP S6423688A
Authority
JP
Japan
Prior art keywords
gain control
automatic gain
detecting
output
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
JP17968187A
Other languages
Japanese (ja)
Inventor
Kanji Mikuni
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.)
Sharp Corp
Original Assignee
Sharp 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 Sharp Corp filed Critical Sharp Corp
Priority to JP17968187A priority Critical patent/JPS6423688A/en
Publication of JPS6423688A publication Critical patent/JPS6423688A/en
Pending legal-status Critical Current

Links

Landscapes

  • Control Of Amplification And Gain Control (AREA)
  • Circuits Of Receivers In General (AREA)
  • Television Receiver Circuits (AREA)

Abstract

PURPOSE:To offer attendance feeling to a brightness level by comparing and detecting a high brightness picture information from a video signal to which the gain control of an automatic gain control circuit is not applied and successively controlling the gain of the automatic gain control circuit. CONSTITUTION:Only at the time of the picture information having the high brightness in an automatic gain control detecting output control means, the detecting output level of the automatic gain control detecting circuit 34 is controlled externally from an automatic gain control system so as to reduce it and inputted to an automatic gain control comparing detecting part 36. In such a way, an automatic gain control among a preamplifier out put signal 31, an automatic gain control amplifier 32 and an automatic gain control output signal 33 is switched at any time and in the picture having many high brightness parts, an output processing is executed so as to a larger automatic gain control output than a constant value to increase the picture brightness. Thereby, a camera can supply the video signal having the attendance feeling.
JP17968187A 1987-07-17 1987-07-17 Automatic gain control circuit Pending JPS6423688A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17968187A JPS6423688A (en) 1987-07-17 1987-07-17 Automatic gain control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17968187A JPS6423688A (en) 1987-07-17 1987-07-17 Automatic gain control circuit

Publications (1)

Publication Number Publication Date
JPS6423688A true JPS6423688A (en) 1989-01-26

Family

ID=16070011

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17968187A Pending JPS6423688A (en) 1987-07-17 1987-07-17 Automatic gain control circuit

Country Status (1)

Country Link
JP (1) JPS6423688A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0496477A (en) * 1990-08-10 1992-03-27 Sharp Corp Automatic gain control circuit
JPH0528311A (en) * 1991-07-24 1993-02-05 Nippon Steel Corp Automatic reading method for billet end face stamp mark

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0496477A (en) * 1990-08-10 1992-03-27 Sharp Corp Automatic gain control circuit
JPH0528311A (en) * 1991-07-24 1993-02-05 Nippon Steel Corp Automatic reading method for billet end face stamp mark

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