JPS5526785A - Automatic picture-quality control circuit of television receiver - Google Patents
Automatic picture-quality control circuit of television receiverInfo
- Publication number
- JPS5526785A JPS5526785A JP10038978A JP10038978A JPS5526785A JP S5526785 A JPS5526785 A JP S5526785A JP 10038978 A JP10038978 A JP 10038978A JP 10038978 A JP10038978 A JP 10038978A JP S5526785 A JPS5526785 A JP S5526785A
- Authority
- JP
- Japan
- Prior art keywords
- trq
- frequency component
- signal
- low
- electric field
- 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
- Picture Signal Circuits (AREA)
Abstract
PURPOSE: To correct automatically picture quality according to an input electric field, by complementarily controlling gains of the high frequency component and low-frequency component of a video signal by an AGC voltage according to the input electric field.
CONSTITUTION: When video signal (a) is inputted to input terminal 12, an out-of-phase signal (b) generated through load resistance R1 of transistor TrQ1 is applied to the base of TrQ4 and its low-frequency component only is outputted via coil L2 of the emitter. Its high-frequency component is differentiating twice by differentiating circuits 13 and 14 of TrQ2 to obtain signal (c), which is added to signal (b), so that picture-quality correction signal (b) with a pre-overshoot given to the variable part for the video signal of the low-frequency component will appear at output terminal 15. In case of a weak electric field, since an AGC voltage applied to the base of TrQ2 falls, a current through TrQ2 decreases, but because TrQ3 serves as a constant-current supply, a current through TrQ1 increases and the gain of the low-frequency component also increases, thereby outputting signal (h) to terminal 15. In case of an intense electric field, the current of TrQ2 increases to increase the gain of the high frequency component while the gain of the low-frequency component lowers to the contrary, thereby outputting signal (l).
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10038978A JPS5526785A (en) | 1978-08-17 | 1978-08-17 | Automatic picture-quality control circuit of television receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10038978A JPS5526785A (en) | 1978-08-17 | 1978-08-17 | Automatic picture-quality control circuit of television receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5526785A true JPS5526785A (en) | 1980-02-26 |
Family
ID=14272634
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10038978A Pending JPS5526785A (en) | 1978-08-17 | 1978-08-17 | Automatic picture-quality control circuit of television receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5526785A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6115472A (en) * | 1984-06-30 | 1986-01-23 | Akai Electric Co Ltd | Profile correcting circuit of video signal |
| JPS6449375A (en) * | 1987-08-19 | 1989-02-23 | Seiko Epson Corp | Automatic picture quality control circuit |
| JPH04349786A (en) * | 1991-05-27 | 1992-12-04 | Fujitsu General Ltd | Automatic picture quality adjustment circuit |
-
1978
- 1978-08-17 JP JP10038978A patent/JPS5526785A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6115472A (en) * | 1984-06-30 | 1986-01-23 | Akai Electric Co Ltd | Profile correcting circuit of video signal |
| JPS6449375A (en) * | 1987-08-19 | 1989-02-23 | Seiko Epson Corp | Automatic picture quality control circuit |
| JPH04349786A (en) * | 1991-05-27 | 1992-12-04 | Fujitsu General Ltd | Automatic picture quality adjustment circuit |
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