JPS54140825A - Picture-quality improving circuit of color television receiver - Google Patents
Picture-quality improving circuit of color television receiverInfo
- Publication number
- JPS54140825A JPS54140825A JP4852878A JP4852878A JPS54140825A JP S54140825 A JPS54140825 A JP S54140825A JP 4852878 A JP4852878 A JP 4852878A JP 4852878 A JP4852878 A JP 4852878A JP S54140825 A JPS54140825 A JP S54140825A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- circuit
- picture
- output
- supplied
- 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.)
- Granted
Links
Abstract
PURPOSE: To make it possible to reproduce a picture whose contour is clear even at the boundary where the picture changes in color.
CONSTITUTION: By passing through high-pass filter 1, luminance signal Y has the only high-band component left and is slightly delayed. Color-difference signal C, on the other hand, is separated into two signals; one signal is supplied to switch alternation circuit 4 via delay circuit 3, and the other is directly to circuit 4. As for the output color difference signal, switch alternation circuit 4 is so switched that signal (d) delayed by circuit 4 will be outputted before a switching signal is supplied from trigger generating circuit 2 to switch alternating circuit 4 by the high component of the luminance signal, namely, a signal indicating the contour position of the picture so as to output the undelayed color difference signal. Then, signals C and (d) are compared by comparator circuit 5 and when the both agree each other, switching signal (f) is supplied in order to output signal (d) by switching. Further, the high-band component of the luminance signal energizes circuit 4, whose output is changed from signal (d) to C.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP53048528A JPS6029275B2 (en) | 1978-04-24 | 1978-04-24 | Image quality improvement circuit for color television receivers |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP53048528A JPS6029275B2 (en) | 1978-04-24 | 1978-04-24 | Image quality improvement circuit for color television receivers |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS54140825A true JPS54140825A (en) | 1979-11-01 |
JPS6029275B2 JPS6029275B2 (en) | 1985-07-09 |
Family
ID=12805852
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP53048528A Expired JPS6029275B2 (en) | 1978-04-24 | 1978-04-24 | Image quality improvement circuit for color television receivers |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6029275B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4506293A (en) * | 1981-07-16 | 1985-03-19 | Rca Corporation | Independent fleshtone contours |
US4739395A (en) * | 1985-11-21 | 1988-04-19 | U.S. Philips Corporation | Circuit arrangement for increasing the definition of color contours of a color television signal using selective edge enhancement |
US4912551A (en) * | 1987-08-04 | 1990-03-27 | Victor Company Of Japan, Ltd. | Circuit for enhancing a color difference signal by utilizing the change of a luminance signal |
-
1978
- 1978-04-24 JP JP53048528A patent/JPS6029275B2/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4506293A (en) * | 1981-07-16 | 1985-03-19 | Rca Corporation | Independent fleshtone contours |
US4739395A (en) * | 1985-11-21 | 1988-04-19 | U.S. Philips Corporation | Circuit arrangement for increasing the definition of color contours of a color television signal using selective edge enhancement |
US4912551A (en) * | 1987-08-04 | 1990-03-27 | Victor Company Of Japan, Ltd. | Circuit for enhancing a color difference signal by utilizing the change of a luminance signal |
US4980755A (en) * | 1987-08-04 | 1990-12-25 | Victor Company Of Japan, Ltd. | Circuit for enhancing a color difference signal by utilizing the change of a luminance signal |
Also Published As
Publication number | Publication date |
---|---|
JPS6029275B2 (en) | 1985-07-09 |
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