JPS5577279A - Forming circuit for control signal - Google Patents
Forming circuit for control signalInfo
- Publication number
- JPS5577279A JPS5577279A JP15137478A JP15137478A JPS5577279A JP S5577279 A JPS5577279 A JP S5577279A JP 15137478 A JP15137478 A JP 15137478A JP 15137478 A JP15137478 A JP 15137478A JP S5577279 A JPS5577279 A JP S5577279A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- counter
- pulse
- signal
- period
- 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
Abstract
PURPOSE: To make it possible to generate easiliy control pulses of fixed width from an external composite synchronizing signal, by forming a control signal controlling a synchronizing signal by the use of a counter.
CONSTITUTION: This circuit consists of forming circuit 1 for clock pulse PC, forming circuit 2 for pulse signals SH of a horizontal period, and a forming circuit for pulse signal SV of a vertical period. In circuit 1, counter 6 counts down outputs of VCO5 where a frequency an integer greater than a horizontal frequency is selected, and the count value is compared with signal SH by phase comparator 7, whose output is supplied to VCO5 by way of LPF8 to form clock pulse PC. Circuit 2, consisting of counter 11 and inhibit circuit 12 provided on a reset terminal R side, forms pulse signal SH of the horizontal period with its pulse width set below one period and above a half the horizontal period. Circuit 3, composed of counter 15 and D type FF circuit 16, form vertical-period pulse signal SV. Counter 20, discriminating the presence of an external synchronizing signal, is formed of a counter. In the above constitution, pulse signals are formed easily and IC-implementation is also realized.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15137478A JPS5577279A (en) | 1978-12-06 | 1978-12-06 | Forming circuit for control signal |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15137478A JPS5577279A (en) | 1978-12-06 | 1978-12-06 | Forming circuit for control signal |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5577279A true JPS5577279A (en) | 1980-06-10 |
JPS6150549B2 JPS6150549B2 (en) | 1986-11-05 |
Family
ID=15517154
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15137478A Granted JPS5577279A (en) | 1978-12-06 | 1978-12-06 | Forming circuit for control signal |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5577279A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58191573A (en) * | 1982-05-06 | 1983-11-08 | Victor Co Of Japan Ltd | Horizontal scanning frequency multiplier circuit |
JPS62171A (en) * | 1985-06-26 | 1987-01-06 | Pioneer Electronic Corp | Reproduced horizontal synchronizing signal generator |
-
1978
- 1978-12-06 JP JP15137478A patent/JPS5577279A/en active Granted
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58191573A (en) * | 1982-05-06 | 1983-11-08 | Victor Co Of Japan Ltd | Horizontal scanning frequency multiplier circuit |
JPS6337550B2 (en) * | 1982-05-06 | 1988-07-26 | Victor Company Of Japan | |
JPS62171A (en) * | 1985-06-26 | 1987-01-06 | Pioneer Electronic Corp | Reproduced horizontal synchronizing signal generator |
Also Published As
Publication number | Publication date |
---|---|
JPS6150549B2 (en) | 1986-11-05 |
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