JPS5478019A - Video control circuit of television receiver - Google Patents
Video control circuit of television receiverInfo
- Publication number
- JPS5478019A JPS5478019A JP14531777A JP14531777A JPS5478019A JP S5478019 A JPS5478019 A JP S5478019A JP 14531777 A JP14531777 A JP 14531777A JP 14531777 A JP14531777 A JP 14531777A JP S5478019 A JPS5478019 A JP S5478019A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- video
- pedestal
- output
- signals
- 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 make it possible to reproduce a stable picture by providing a video control circuit which can adjust automatically the brightness and the contrast of the picture and cancel the irregularity of the brightness and the contrast of the picture.
CONSTITUTION: In the video circuit of a TV receiver, video signals detected by video detector circuit 1 are applied to signal processing circuit 2, and additional signals at a reference white level are added from additional signal circuit 3, and these signals are applied to video gain variable circuit 4 as composite video signals. The gain of composite video signals is controlled in this circuit 4 by the output of additional signal circuit 3, and the output is applied to pedestal control circuit 5. Then, the level of pedestal is controlled in circuit 5 by the output of pedestal comparator circuit 11, and the output is applied to current detector circuit 7 through video amplifier circuit 6. The current of composite video signals which is applied to CRT 8 through circuit 7 is detected by circuit 7, and this detected current is applied to pedestal and additional signal gate circuits 9 and 10 respectively, thereby controlling the pedestal field and the additional signal field to a fixed level.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14531777A JPS5478019A (en) | 1977-12-02 | 1977-12-02 | Video control circuit of television receiver |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14531777A JPS5478019A (en) | 1977-12-02 | 1977-12-02 | Video control circuit of television receiver |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5478019A true JPS5478019A (en) | 1979-06-21 |
Family
ID=15382355
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14531777A Pending JPS5478019A (en) | 1977-12-02 | 1977-12-02 | Video control circuit of television receiver |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5478019A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5714570U (en) * | 1980-06-27 | 1982-01-25 | ||
JPS5871769A (en) * | 1981-10-23 | 1983-04-28 | Sony Corp | Control circuit of reference level |
JPS60223272A (en) * | 1984-04-18 | 1985-11-07 | Sony Corp | Luminance controller |
-
1977
- 1977-12-02 JP JP14531777A patent/JPS5478019A/en active Pending
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5714570U (en) * | 1980-06-27 | 1982-01-25 | ||
JPH0119496Y2 (en) * | 1980-06-27 | 1989-06-06 | ||
JPS5871769A (en) * | 1981-10-23 | 1983-04-28 | Sony Corp | Control circuit of reference level |
JPH0374072B2 (en) * | 1981-10-23 | 1991-11-25 | ||
JPS60223272A (en) * | 1984-04-18 | 1985-11-07 | Sony Corp | Luminance controller |
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