JPS5556768A - Vertical synchronism detector circuit - Google Patents
Vertical synchronism detector circuitInfo
- Publication number
- JPS5556768A JPS5556768A JP13034678A JP13034678A JPS5556768A JP S5556768 A JPS5556768 A JP S5556768A JP 13034678 A JP13034678 A JP 13034678A JP 13034678 A JP13034678 A JP 13034678A JP S5556768 A JPS5556768 A JP S5556768A
- Authority
- JP
- Japan
- Prior art keywords
- counter
- pulse
- counting
- synchronous
- circuit
- 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 obtain a vertical synchronism detector circuit which is suited for formation into the integrated circuit and can obtain the pulse of the steady phase.
CONSTITUTION: The composite synchronous pulse isolated by synchronous isolator circuit 22 is applied to up-down counter 23. And counter 23 is switched to the up-counting when the synchronous pulse exists and to the down-counting when no synchronous pulse exists. Up-counting clock pulse generator circuit 31 is provided along with down-counting clock pulse generator circuit 32, and the both circuits generate the clock pulses of different frequencies to each other. Then the output of counter 23 is supplied to comparator 35 to be compared with the data determined previously. Comparator 35 delivers the rise pulse when the output given from counter 23 becomes larger than the set data. Thus counter 36 is driven to lead out the vertical synchronous pulse to output terminal 37.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13034678A JPS5556768A (en) | 1978-10-23 | 1978-10-23 | Vertical synchronism detector circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13034678A JPS5556768A (en) | 1978-10-23 | 1978-10-23 | Vertical synchronism detector circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5556768A true JPS5556768A (en) | 1980-04-25 |
JPS6150430B2 JPS6150430B2 (en) | 1986-11-04 |
Family
ID=15032185
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13034678A Granted JPS5556768A (en) | 1978-10-23 | 1978-10-23 | Vertical synchronism detector circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5556768A (en) |
-
1978
- 1978-10-23 JP JP13034678A patent/JPS5556768A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS6150430B2 (en) | 1986-11-04 |
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