JPS56141686A - Color demodulation equipment - Google Patents
Color demodulation equipmentInfo
- Publication number
- JPS56141686A JPS56141686A JP4489480A JP4489480A JPS56141686A JP S56141686 A JPS56141686 A JP S56141686A JP 4489480 A JP4489480 A JP 4489480A JP 4489480 A JP4489480 A JP 4489480A JP S56141686 A JPS56141686 A JP S56141686A
- Authority
- JP
- Japan
- Prior art keywords
- output
- switch
- chrominance
- signal
- switches
- 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 demodulate an exact R-Y color difference signal without controlling the phase of the line change-over switch, by controlling the first and second switches by the output of the phase discriminator, by making the polarity of a chrominance signal of the output of the first switch coincide with that of a chrominance subcarrier of the output of the third switch. CONSTITUTION:The first and second switches 12, 16 which can be interlocked and switched are installed, a chrominance signal of the PAL system color TV signal, and a chrominance signal of inverted polarity are provided to the input of the switch 12, and its output is provided to the R-Y demodulator 6. Also, the third and fourth switches 24, 28 which can be interlocked and switched at every 1 horizontal scanning line are installed, a chrominance subcarrier from the local subcarrier oscillator 20 is provided to the switch 24, and the output of the switch 24 is provided to the demodulator 6. During each horizontal scanning period, the chrominance subcarrier whose polarity has been fixed is provided to the phase discriminator 17, the switches 12, 16 are controlled by the output of the discriminator 17, the polarity of a chrominance signal of an output of the switch 12 is made to coincide with that of an output chrominance subcarrier of the switch 24, and an exact R-Y color difference signal is demodulated.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4489480A JPS56141686A (en) | 1980-04-04 | 1980-04-04 | Color demodulation equipment |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4489480A JPS56141686A (en) | 1980-04-04 | 1980-04-04 | Color demodulation equipment |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS56141686A true JPS56141686A (en) | 1981-11-05 |
JPS6130471B2 JPS6130471B2 (en) | 1986-07-14 |
Family
ID=12704181
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4489480A Granted JPS56141686A (en) | 1980-04-04 | 1980-04-04 | Color demodulation equipment |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56141686A (en) |
-
1980
- 1980-04-04 JP JP4489480A patent/JPS56141686A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS6130471B2 (en) | 1986-07-14 |
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