JPS5571389A - Generation system of clock signal - Google Patents
Generation system of clock signalInfo
- Publication number
- JPS5571389A JPS5571389A JP14415578A JP14415578A JPS5571389A JP S5571389 A JPS5571389 A JP S5571389A JP 14415578 A JP14415578 A JP 14415578A JP 14415578 A JP14415578 A JP 14415578A JP S5571389 A JPS5571389 A JP S5571389A
- Authority
- JP
- Japan
- Prior art keywords
- output
- phase
- signals
- clocks
- frequency
- 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
- Color Television Systems (AREA)
Abstract
PURPOSE: To improve precision and stability of the frequency of clocks by subjecting input NTSC color signals and signals, which are obtained by delaying input NTSC color signals, to addition and subtraction, phase detection and low-pass filtering and feeding back them to a clock generation circuit.
CONSTITUTION: NTSC color picture signals inputted to terminal 1 are inputted to memory 2, analogue adder 3 and 90° phase shifter 5. Memory 2 delays the input color picture and stores n-number sample points. Now, for example, when the delay time is defined as one horizontal scanning period, the output of color burst extraction circuit 4 becomes zero because two picture signals inputted to analogue adder 3 have phases of the color burst chrominance subcarrier inverted; however, when the frequency of clocks is slipped from the reference value and the delay time generates error for one horizontal scanning period, the output above does not become zero. An output proportional to the error above is obtained by using a signal, which is obtained by shifting the phase of this output by 90° phase shifter 5, for phase detection in phase detector 6. This output is smoothed by LPF 7 and is fed back to circuit 8, thus improving stability of the frequency of clocks.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP53144155A JPS5919670B2 (en) | 1978-11-24 | 1978-11-24 | Clock signal generation method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP53144155A JPS5919670B2 (en) | 1978-11-24 | 1978-11-24 | Clock signal generation method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5571389A true JPS5571389A (en) | 1980-05-29 |
JPS5919670B2 JPS5919670B2 (en) | 1984-05-08 |
Family
ID=15355476
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP53144155A Expired JPS5919670B2 (en) | 1978-11-24 | 1978-11-24 | Clock signal generation method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5919670B2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63138030A (en) * | 1986-11-29 | 1988-06-10 | 株式会社竹中工務店 | Indoor water supply piping |
JPH0412557U (en) * | 1990-05-16 | 1992-01-31 |
-
1978
- 1978-11-24 JP JP53144155A patent/JPS5919670B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS5919670B2 (en) | 1984-05-08 |
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