JPS5478617A - Automatic level adjusting system for video signal - Google Patents
Automatic level adjusting system for video signalInfo
- Publication number
- JPS5478617A JPS5478617A JP14626177A JP14626177A JPS5478617A JP S5478617 A JPS5478617 A JP S5478617A JP 14626177 A JP14626177 A JP 14626177A JP 14626177 A JP14626177 A JP 14626177A JP S5478617 A JPS5478617 A JP S5478617A
- Authority
- JP
- Japan
- Prior art keywords
- video signal
- signal
- video
- level
- lens
- 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
Abstract
PURPOSE: To ensure an effective automatic adjustment for the video signal level by keeping constant the video level at the area where the monitor is required by means of the gate pulse generator circuit and the video signal gate circuit.
CONSTITUTION: The light sent from the subject forms an image at the pickup tube within TV camera 4 through electrically-driven lens 1, and thus the video signal is generated to be supplied to video signal gate circuit 6. Here, part of the video signal is drawn out only for the pulse period of the gate pulse, and the signal at part of the picture frame is supplied to servo amplifier 5 as the control signal. The peak value of the control signal is then detected and drawn out, and the video level at the area where the monitor is required can be kept constant by driving lens diaphragm 2 within lens 1. In this way, an automatic adjustment becomes possible effectively for the signal level.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14626177A JPS5478617A (en) | 1977-12-05 | 1977-12-05 | Automatic level adjusting system for video signal |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14626177A JPS5478617A (en) | 1977-12-05 | 1977-12-05 | Automatic level adjusting system for video signal |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5478617A true JPS5478617A (en) | 1979-06-22 |
Family
ID=15403730
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14626177A Pending JPS5478617A (en) | 1977-12-05 | 1977-12-05 | Automatic level adjusting system for video signal |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5478617A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5651160A (en) * | 1979-10-03 | 1981-05-08 | Hitachi Ltd | Image pickup device |
JPS56149179A (en) * | 1980-04-21 | 1981-11-18 | Canon Inc | Video camera |
JPS60178779A (en) * | 1984-02-24 | 1985-09-12 | Olympus Optical Co Ltd | Electronic image-pickup device |
-
1977
- 1977-12-05 JP JP14626177A patent/JPS5478617A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5651160A (en) * | 1979-10-03 | 1981-05-08 | Hitachi Ltd | Image pickup device |
JPS56149179A (en) * | 1980-04-21 | 1981-11-18 | Canon Inc | Video camera |
JPH0156590B2 (en) * | 1980-04-21 | 1989-11-30 | Canon Kk | |
JPS60178779A (en) * | 1984-02-24 | 1985-09-12 | Olympus Optical Co Ltd | Electronic image-pickup device |
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