JPS5588472A - Reset pulse forming circuit - Google Patents
Reset pulse forming circuitInfo
- Publication number
- JPS5588472A JPS5588472A JP16353878A JP16353878A JPS5588472A JP S5588472 A JPS5588472 A JP S5588472A JP 16353878 A JP16353878 A JP 16353878A JP 16353878 A JP16353878 A JP 16353878A JP S5588472 A JPS5588472 A JP S5588472A
- Authority
- JP
- Japan
- Prior art keywords
- pulse
- circuit
- synchronous
- forming circuit
- horizontal
- 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
- Synchronizing For Television (AREA)
Abstract
PURPOSE: To always ensure the resetting for the vertical synchronism in the same timing regardless of the types of the external synchronous signals by providing the forming circuit of the pulse signal synchronized with the external composite synchronous signal to obtain the horizontal and vertical synchronous pulse signals.
CONSTITUTION: The reset pulse forming circuit consists of forming circuit 10 for the pulse signal synchronized with the external composite synchronous signal pulse pulse forming circuit 20 which forms the reset pulse via the horizontal and vertical synchronous pulse signals obtained from circuit 10. PLL1 of circuit 10 gives the phase comparison between the output obtained by giving the 1/n division to the frequency of VCO5 through counter 6 and horizontal synchronous pulse signal SH via phase comparator 7, and this comparison output is changed into the control voltage of VCO through LPF8. Forming circuit 2 consists of counter 11 and inhibit circuit 12 and forms horizontal synchronous pulse signal SH. Forming circuit 3 comprises counter 15 and FF16 to form vertical synchronous pulse signal SV. The reset pulse is formed at circuit 20 and based on pulses SH and SV, and the timing is adjusted for the field pulse synchronized with the external synchronous input through timing adjusting circuit. Thus the accurate reset pulse is obtained.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16353878A JPS5588472A (en) | 1978-12-25 | 1978-12-25 | Reset pulse forming circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16353878A JPS5588472A (en) | 1978-12-25 | 1978-12-25 | Reset pulse forming circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5588472A true JPS5588472A (en) | 1980-07-04 |
JPS6159034B2 JPS6159034B2 (en) | 1986-12-15 |
Family
ID=15775779
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16353878A Granted JPS5588472A (en) | 1978-12-25 | 1978-12-25 | Reset pulse forming circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5588472A (en) |
-
1978
- 1978-12-25 JP JP16353878A patent/JPS5588472A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS6159034B2 (en) | 1986-12-15 |
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