JPS54155726A - Color demodulator for color television signal - Google Patents
Color demodulator for color television signalInfo
- Publication number
- JPS54155726A JPS54155726A JP6520478A JP6520478A JPS54155726A JP S54155726 A JPS54155726 A JP S54155726A JP 6520478 A JP6520478 A JP 6520478A JP 6520478 A JP6520478 A JP 6520478A JP S54155726 A JPS54155726 A JP S54155726A
- Authority
- JP
- Japan
- Prior art keywords
- color
- signals
- signal
- delay
- phase
- 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
Landscapes
- Processing Of Color Television Signals (AREA)
Abstract
PURPOSE: To simplify the IC-implementation of a demodulation circuit by eliminating the need to adjust a color synchronizing detection function and delay time by using a charge transfer element for the delay line of a color demodulator for color TV signals using a PLL system.
CONSTITUTION: At the time of the color demodulation of a color TV signal using a PLL system, a chrominance signal from terminal 11 is supplied to phase inverter 21 to obtain chrominance signals which are mutually 180° out of phase, and both the signals are applied to sampling circuits 24 and 28 for color difference signals, where sampling operations are carried out by utilizing sampling pulses from pulse generators 25 and 36. At this time, a chrominance signal in phase with the modulation axis of the color difference signal from inverter 21 is applied to 1H delay lines 22 and 30, where it is delayed a half the odd number times a subcarrier frequency close to a 1H period by making use of clock signals from generators 25 and 26; and outputs of delay lines 22 and 30 and those of circuits 24 and 28 are applied to summing arithmetic circuits 23 and 29, where the 1H-delayed color difference signal is mixed with the non-delay signal, thereby eliminating the color error in a scanning period.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6520478A JPS54155726A (en) | 1978-05-30 | 1978-05-30 | Color demodulator for color television signal |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6520478A JPS54155726A (en) | 1978-05-30 | 1978-05-30 | Color demodulator for color television signal |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54155726A true JPS54155726A (en) | 1979-12-08 |
Family
ID=13280143
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6520478A Pending JPS54155726A (en) | 1978-05-30 | 1978-05-30 | Color demodulator for color television signal |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54155726A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04362895A (en) * | 1991-06-10 | 1992-12-15 | Canon Inc | Color signal processor |
-
1978
- 1978-05-30 JP JP6520478A patent/JPS54155726A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04362895A (en) * | 1991-06-10 | 1992-12-15 | Canon Inc | Color signal processor |
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