JPS56141681A - Color demodulation equipment - Google Patents
Color demodulation equipmentInfo
- Publication number
- JPS56141681A JPS56141681A JP4488780A JP4488780A JPS56141681A JP S56141681 A JPS56141681 A JP S56141681A JP 4488780 A JP4488780 A JP 4488780A JP 4488780 A JP4488780 A JP 4488780A JP S56141681 A JPS56141681 A JP S56141681A
- Authority
- JP
- Japan
- Prior art keywords
- switch
- output
- chrominance
- passed
- polarity
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/44—Colour synchronisation
- H04N9/465—Synchronisation of the PAL-switch
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Processing Of Color Television Signals (AREA)
Abstract
PURPOSE:To exactly obtain an R-Y color difference signal without controlling the phase of the line change-over switch of fH/2, by switching the static switch only when the polarity of an R-Y axis component of a burst signal does not coincide with the polarity of a chrominance subcarrier for demodulation, which is provided to the R-Y demodulator. CONSTITUTION:A burst signal whose polarity is inverted relating to the R-Y axis, and a chrominance carrier signal are inputted to the input terminal 1, the output which has passed through the inversional circuit 11 of the chrominance signal, and the output which has not passed it through are provided to the first switch 12, and the output of the switch 12 is provided to the R-Y demodulator 6. And, a chrominance subcarrier is generated by the local chrominance subscarrier oscillator 20 by synchronizing with a burst signal to be added to chrominance components of PAL system, the output which has passed through the inversional circuit 23 of said carrier, and the output which has not passed it through are provided to the third switch 24, and the output of the switch 24 is provided to the demodulator 6 as a demodulation carrier. The polarity of the burst signal of the fourth switch 28, and that of the demodulation carrier are decided by the phase discriminator 17, and when both signals are mot matched, the switch 24 is switched so that the R-Y demodulating operation is made exactly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4488780A JPS56141681A (en) | 1980-04-04 | 1980-04-04 | Color demodulation equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4488780A JPS56141681A (en) | 1980-04-04 | 1980-04-04 | Color demodulation equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56141681A true JPS56141681A (en) | 1981-11-05 |
| JPS6132871B2 JPS6132871B2 (en) | 1986-07-30 |
Family
ID=12703988
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4488780A Granted JPS56141681A (en) | 1980-04-04 | 1980-04-04 | Color demodulation equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56141681A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4644388A (en) * | 1983-12-09 | 1987-02-17 | Thomson-Csf | Process and circuit for the demodulation of chrominance signals |
-
1980
- 1980-04-04 JP JP4488780A patent/JPS56141681A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4644388A (en) * | 1983-12-09 | 1987-02-17 | Thomson-Csf | Process and circuit for the demodulation of chrominance signals |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6132871B2 (en) | 1986-07-30 |
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