JPS55154892A - Improving circuit for frequency characteristic of color signal - Google Patents
Improving circuit for frequency characteristic of color signalInfo
- Publication number
- JPS55154892A JPS55154892A JP6303779A JP6303779A JPS55154892A JP S55154892 A JPS55154892 A JP S55154892A JP 6303779 A JP6303779 A JP 6303779A JP 6303779 A JP6303779 A JP 6303779A JP S55154892 A JPS55154892 A JP S55154892A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- supplied
- color difference
- frequency
- difference 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/77—Circuits for processing the brightness signal and the chrominance signal relative to each other, e.g. adjusting the phase of the brightness signal relative to the colour signal, correcting differential gain or differential phase
Abstract
PURPOSE:To make it possible to reproduce pictures of high quality all the time by improving color resolution by performing high-frequency compensation of a color signal only when the value of a color difference signal increases above a fixed value. CONSTITUTION:Demodulated color difference signal (R-Y)N supplied to terminal 1 is supplied to LPF2 to extract low-frequency color difference signal (R-Y)L. Further, luminance signal YW supplied to terminal 3 is supplied to LPF4 of extract only low-frequency luminance signal YL, which is supplied together with signal (R-Y)L to divider 5, which obtains their ratio (R-Y)L/YL. Together with high- frequency luminance signal YH obtained by HPF6, the ratio output is supplied to multiplier 7 to find product (R-Y)H of the both. The output of this product is mixed into signal (R-Y)L by synthesizer 8 to obtain composite output (R-Y)W, so that the frequency band of a color difference signal of red appears to the widened. In this case, forming circuit 20 for a switching signal turns ON switch circuit 10 by receiving input color information with the value of the color difference signal above a fixed value, providing high-frequency compensation.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6303779A JPS55154892A (en) | 1979-05-21 | 1979-05-21 | Improving circuit for frequency characteristic of color signal |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6303779A JPS55154892A (en) | 1979-05-21 | 1979-05-21 | Improving circuit for frequency characteristic of color signal |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55154892A true JPS55154892A (en) | 1980-12-02 |
Family
ID=13217720
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6303779A Pending JPS55154892A (en) | 1979-05-21 | 1979-05-21 | Improving circuit for frequency characteristic of color signal |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55154892A (en) |
-
1979
- 1979-05-21 JP JP6303779A patent/JPS55154892A/en active Pending
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS5484426A (en) | Frequency improving circuit for chrominance signal | |
JPS55154893A (en) | Improving circuit for frequency characteristic of color signal | |
JPS55154894A (en) | Improving circuit for frequency characteristic of color signal | |
JPS55154892A (en) | Improving circuit for frequency characteristic of color signal | |
JPS56140788A (en) | Color pickup device | |
JPS5260648A (en) | Color display for frequency components | |
JPS54140825A (en) | Picture-quality improving circuit of color television receiver | |
JPS55120282A (en) | Color solid pickup unit | |
JPS5579593A (en) | Color video signal reproduction system | |
GB1478970A (en) | Beam indexing television display apparatus | |
JPS55163977A (en) | Color solid-state pickup unit | |
GB2002990A (en) | Dual standard video record player | |
JPS56166683A (en) | Processing circuit for color television signal | |
JPS5575387A (en) | Chroma circuit | |
JPS5269529A (en) | Color tv receiver | |
JPS5639689A (en) | Luminance signal synthesizer | |
JPS5623079A (en) | Television picture receiver | |
JPS5744387A (en) | Index-system color television receiver | |
JPS55132186A (en) | Chroma-key signal generator | |
JPS5558687A (en) | Chroma circuit | |
JPS53145522A (en) | Beam index type color television picture receiver | |
JPS5631289A (en) | Beam index type color television receiver | |
JPS5362926A (en) | Color television picture receiver | |
JPS5397731A (en) | Color television picture receiver | |
JPS55124384A (en) | Color signal modulator |