JPS6458178A - Video processing system for television receiver - Google Patents
Video processing system for television receiverInfo
- Publication number
- JPS6458178A JPS6458178A JP21475287A JP21475287A JPS6458178A JP S6458178 A JPS6458178 A JP S6458178A JP 21475287 A JP21475287 A JP 21475287A JP 21475287 A JP21475287 A JP 21475287A JP S6458178 A JPS6458178 A JP S6458178A
- Authority
- JP
- Japan
- Prior art keywords
- increased
- level
- resistor
- current
- video signal
- 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
- Television Receiver Circuits (AREA)
Abstract
PURPOSE:To reproduce an optimum black level in the amplitude range of all video signals by varying the DC level of a video signal in interlocking with the amplitude control voltage of the video signal. CONSTITUTION:In increasing the level of a contrast control signal Cc, the emitter potential V2 of a transistor(TR) Q2 is increased and a current flowing to a resistor R1 via a resistor R2 is increased. On the other hand, in considering the R video output signal VR supplied to the base of a TR Q1 constant, since the current i1 flowing to the resistor R1 is considered to be constant, when the current i2 is increased, the current i1 is decreased, the potential of the load resistor R3 is increased and the DC level fed to the R cathode is increased. As a result, the DC level is changed as shown in the video signal 13 and even when the video image amplitude is increased/decreased in response to the 10IRE of the original video signal 11 in the contrast adjustment, it is possible to locate the cut-off voltage to the location of 10IRE in response to the increasing/ decreasing rate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21475287A JPS6458178A (en) | 1987-08-28 | 1987-08-28 | Video processing system for television receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21475287A JPS6458178A (en) | 1987-08-28 | 1987-08-28 | Video processing system for television receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6458178A true JPS6458178A (en) | 1989-03-06 |
Family
ID=16660985
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21475287A Pending JPS6458178A (en) | 1987-08-28 | 1987-08-28 | Video processing system for television receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6458178A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5339114A (en) * | 1992-07-29 | 1994-08-16 | Thomson Consumer Electronics, Inc. | Television receiver with luminance signal clamped offset and re-clamped prior to contrast control for preventing black level changes with contrast control changes when displaying luminance signals having elevated black level |
| US5339011A (en) * | 1992-02-18 | 1994-08-16 | Sony Corporation | Display device |
-
1987
- 1987-08-28 JP JP21475287A patent/JPS6458178A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5339011A (en) * | 1992-02-18 | 1994-08-16 | Sony Corporation | Display device |
| US5339114A (en) * | 1992-07-29 | 1994-08-16 | Thomson Consumer Electronics, Inc. | Television receiver with luminance signal clamped offset and re-clamped prior to contrast control for preventing black level changes with contrast control changes when displaying luminance signals having elevated black level |
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