JPS5525246A - Color signal demodulator circuit - Google Patents
Color signal demodulator circuitInfo
- Publication number
- JPS5525246A JPS5525246A JP9791778A JP9791778A JPS5525246A JP S5525246 A JPS5525246 A JP S5525246A JP 9791778 A JP9791778 A JP 9791778A JP 9791778 A JP9791778 A JP 9791778A JP S5525246 A JPS5525246 A JP S5525246A
- Authority
- JP
- Japan
- Prior art keywords
- period
- circuit
- gain
- sample
- gives
- 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
Landscapes
- Processing Of Color Television Signals (AREA)
Abstract
PURPOSE: To secure a perfect compensation for each fluctuation by providing the closed loop which detects and controls both the gain and phase fluctuations of the 1H period delay circuit caused by the temperature characteristics.
CONSTITUTION: The 1H period delay circuit 5 gives 1H delay to the burst and carrier chrominance signals; sample holding circuit 19 gives the sample holding to the detection signals for the period when the burst signal is detected via phase detector 16 with the sample pulse of the 2H period; and sample holding circuit 20 gives the sample holding to the detection signals of phase detector 17 with the sample pulse of the 2H-period interval which differs from the sample pulse by 1H period. Then the detection voltage is compared between circuits 19 and 20, and the difference voltage is detected 17 and 16. With this difference voltage the gain of automatic gain control circuit 14 is controlled. Thus the closed loop is installed to detect and control through the color demodulation circuit both the gain and phase fluctuations of circuit 5 caused by the temperature characteristics. As a result, each fluctuation can be compensated perfectly.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9791778A JPS5525246A (en) | 1978-08-10 | 1978-08-10 | Color signal demodulator circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9791778A JPS5525246A (en) | 1978-08-10 | 1978-08-10 | Color signal demodulator circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5525246A true JPS5525246A (en) | 1980-02-22 |
| JPS6129593B2 JPS6129593B2 (en) | 1986-07-08 |
Family
ID=14205046
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9791778A Granted JPS5525246A (en) | 1978-08-10 | 1978-08-10 | Color signal demodulator circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5525246A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59122197A (en) * | 1982-12-23 | 1984-07-14 | トムソン‐セーエスエフ | Delay line automatic compensating circuit for pal type television receiver |
| US4652778A (en) * | 1982-10-20 | 1987-03-24 | Sanyo Electric Co., Ltd. | I2 L delay circuit with phase comparator and temperature compensator for maintaining a constant delay time |
| US5473388A (en) * | 1993-02-23 | 1995-12-05 | Kabushiki Kaisha Toshiba | PAL chroma signal demodulating apparatus |
-
1978
- 1978-08-10 JP JP9791778A patent/JPS5525246A/en active Granted
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4652778A (en) * | 1982-10-20 | 1987-03-24 | Sanyo Electric Co., Ltd. | I2 L delay circuit with phase comparator and temperature compensator for maintaining a constant delay time |
| JPS59122197A (en) * | 1982-12-23 | 1984-07-14 | トムソン‐セーエスエフ | Delay line automatic compensating circuit for pal type television receiver |
| JPH0561837B2 (en) * | 1982-12-23 | 1993-09-07 | Thomson Csf | |
| US5473388A (en) * | 1993-02-23 | 1995-12-05 | Kabushiki Kaisha Toshiba | PAL chroma signal demodulating apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6129593B2 (en) | 1986-07-08 |
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