JPS5577280A - Forming circuit for field decision signal - Google Patents
Forming circuit for field decision signalInfo
- Publication number
- JPS5577280A JPS5577280A JP15216678A JP15216678A JPS5577280A JP S5577280 A JPS5577280 A JP S5577280A JP 15216678 A JP15216678 A JP 15216678A JP 15216678 A JP15216678 A JP 15216678A JP S5577280 A JPS5577280 A JP S5577280A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- signal
- counter
- generate
- forming
- 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 make it possible to generate a field decision signal by forming a circuit which generates horizontal and vertical pulses and clock pulses, and then by utilizing its outputs.
CONSTITUTION: This circuit consists of forming circuit 1 for clock pulse PC, forming circuit 2 for horizontal-period pulse signals, and forming circuit 3 for vertical- period pulse signals. Circuit 1, employing the PLL constitution of VCO5, counter 6, phase comparator 7, and LPF8, generate clock pulse PC. Circuit 2, consisting of counter 11 and inhibit circuit 12 provided on a reset terminal R side, generate 1st horizontal-period pulse signal SH. Circuit 3, composed of counter 15 and D-type FF circuit 16, generate 2nd vertical-period pulse signal SV. The 3rd pulse signal PCK outputted by counter 15 and signals SH and SV are passed through shift registers 20 and 21 to obtain field decision signal SF, an AND output. This constitution forms signal SF from an external composite synchronizing signal without using a multivibrator, etc., so that IC-implementation will be realized.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15216678A JPS5577280A (en) | 1978-12-07 | 1978-12-07 | Forming circuit for field decision signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15216678A JPS5577280A (en) | 1978-12-07 | 1978-12-07 | Forming circuit for field decision signal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5577280A true JPS5577280A (en) | 1980-06-10 |
| JPS6144436B2 JPS6144436B2 (en) | 1986-10-02 |
Family
ID=15534460
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15216678A Granted JPS5577280A (en) | 1978-12-07 | 1978-12-07 | Forming circuit for field decision signal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5577280A (en) |
-
1978
- 1978-12-07 JP JP15216678A patent/JPS5577280A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6144436B2 (en) | 1986-10-02 |
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