JPS6449487A - Luminance signal processing circuit - Google Patents
Luminance signal processing circuitInfo
- Publication number
- JPS6449487A JPS6449487A JP62206786A JP20678687A JPS6449487A JP S6449487 A JPS6449487 A JP S6449487A JP 62206786 A JP62206786 A JP 62206786A JP 20678687 A JP20678687 A JP 20678687A JP S6449487 A JPS6449487 A JP S6449487A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- signal
- luminance signal
- luminance
- horizontal synchronizing
- 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 surely remove noise by switching the clipping level of a picture- quality-corrected luminance signal when a control signal is not generated according to the output signal of a horizontal synchronizing signal separating circuit in the clamped luminance signal. CONSTITUTION:For the luminance signal demodulated by an FM demodulating circuit 1, the point of a horizontal synchronizing signal is clamped at a prescribed potential by a clamping circuit 2, and thereafter, the signal is supplied to a delaying circuit 9 and a synchronizing separating circuit 10. For the luminance signal delayed for a prescribed time by the circuit 9, a picture quality correction is executed by a picture quality correcting circuit 3. From the luminance signal impressed to the circuit 10, the horizontal synchronizing signal is separated and, further, waveform-shaped at a monostable multi circuit 11. For a variable clipping circuit 12, the clipping level varies according to the output control signal of the circuit 11. Consequently, the picture quality correction is executed to the input terminal of a mixing circuit 5, simultaneously, the luminance signal is obtained in which the noise is removed in a black direction, the signal is mixed with a chroma signal from a color signal processing circuit 4, and a satisfactory video signal can be reproduced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62206786A JPS6449487A (en) | 1987-08-20 | 1987-08-20 | Luminance signal processing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62206786A JPS6449487A (en) | 1987-08-20 | 1987-08-20 | Luminance signal processing circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6449487A true JPS6449487A (en) | 1989-02-23 |
Family
ID=16529071
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62206786A Pending JPS6449487A (en) | 1987-08-20 | 1987-08-20 | Luminance signal processing circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6449487A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03128577A (en) * | 1989-10-13 | 1991-05-31 | Mitsubishi Electric Corp | Contour emphasis system in video equipment |
-
1987
- 1987-08-20 JP JP62206786A patent/JPS6449487A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03128577A (en) * | 1989-10-13 | 1991-05-31 | Mitsubishi Electric Corp | Contour emphasis system in video equipment |
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