JPS6423688A - Automatic gain control circuit - Google Patents
Automatic gain control circuitInfo
- 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
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.
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)
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 |
-
1987
- 1987-07-17 JP JP17968187A patent/JPS6423688A/en active Pending
Cited By (2)
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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