JPS56115086A - Color demodulator - Google Patents
Color demodulatorInfo
- Publication number
- JPS56115086A JPS56115086A JP1835180A JP1835180A JPS56115086A JP S56115086 A JPS56115086 A JP S56115086A JP 1835180 A JP1835180 A JP 1835180A JP 1835180 A JP1835180 A JP 1835180A JP S56115086 A JPS56115086 A JP S56115086A
- Authority
- JP
- Japan
- Prior art keywords
- switch
- signal
- subcarrier
- terminal
- demodulator
- 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
- H04N11/00—Colour television systems
- H04N11/06—Transmission systems characterised by the manner in which the individual colour picture signal components are combined
- H04N11/12—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only
- H04N11/14—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only in which one signal, modulated in phase and amplitude, conveys colour information and a second signal conveys brightness information, e.g. NTSC-system
- H04N11/16—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only in which one signal, modulated in phase and amplitude, conveys colour information and a second signal conveys brightness information, e.g. NTSC-system the chrominance signal alternating in phase, e.g. PAL-system
- H04N11/165—Decoding means therefor
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Processing Of Color Television Signals (AREA)
Abstract
PURPOSE:To ensure an accurate demodulation of a R-Y color difference signal, by producing the fH/2-line switch signal without controlling the phase of the fH/2-line changeover switch. CONSTITUTION:The carrier chrominance signal of the TV signal is applied to one input terminal of the 1st switch 12; while the carrier chrominance signal having an inversion of polarity given to the R-Y axis is applied to the other terminal. The output of the switch 12 is applied to the R-Y demodulator 6. At the same time, the burst signal corresponding to the signal of the switch 12 is applied to one and the other terminals of the 2nd switch 16 that has an operation coupling to the switch 12. Furthermore the chrominance subcarrier signal of the R-Y axis is applied to one terminal of the 3rd switch 24 having two input terminals, and the inverse subcarrier of the -(R-Y) axis is applied to the other terminal each. Then the output subcarrier of the switch 24 is applied to the demodulator 6, and the burst signal of the switch 16 and the chrominance subcarrier to be applied to the demodulator 6 are applied to the phase discriminator 17. The switch signal is produed when no coincidence is obtained for the polarity between the subcarrier and the burst signal, and thus the switches 12 and 16 are changed over with each other.
Priority Applications (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1835180A JPS56115086A (en) | 1980-02-15 | 1980-02-15 | Color demodulator |
AU57384/80A AU519140B2 (en) | 1979-04-19 | 1980-04-11 | Pal demodulator |
US06/139,223 US4300155A (en) | 1979-04-19 | 1980-04-11 | PAL Demodulator having non-synchronized line switch |
AT0206580A AT378649B (en) | 1979-04-19 | 1980-04-17 | COLOR DEMODULATOR FOR PAL COLOR TELEVISION SIGNALS |
GB8012737A GB2049342B (en) | 1979-04-19 | 1980-04-17 | Demodulator circuit for pal colour television signals |
FR8008629A FR2454737B1 (en) | 1979-04-19 | 1980-04-17 | DEMODULATOR CIRCUIT FOR COLOR TELEVISION SIGNALS |
DE3014883A DE3014883C2 (en) | 1979-04-19 | 1980-04-17 | Color demodulator for PAL color television signals |
SE8002930A SE447690B (en) | 1979-04-19 | 1980-04-18 | FERGDEMODULATORKRETS |
NL8002282A NL8002282A (en) | 1979-04-19 | 1980-04-18 | DEMODULATION LINK FOR COLOR TELEVISION SIGNALS IN THE PAL SYSTEM. |
FI801250A FI69948C (en) | 1979-04-19 | 1980-04-18 | DEMODULATORKRETS FOER FAERGTELEVISIONSSIGNALER |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1835180A JPS56115086A (en) | 1980-02-15 | 1980-02-15 | Color demodulator |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS56115086A true JPS56115086A (en) | 1981-09-10 |
JPS6129591B2 JPS6129591B2 (en) | 1986-07-08 |
Family
ID=11969245
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1835180A Granted JPS56115086A (en) | 1979-04-19 | 1980-02-15 | Color demodulator |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56115086A (en) |
-
1980
- 1980-02-15 JP JP1835180A patent/JPS56115086A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS6129591B2 (en) | 1986-07-08 |
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