JPH0221975U - - Google Patents
Info
- Publication number
- JPH0221975U JPH0221975U JP10025788U JP10025788U JPH0221975U JP H0221975 U JPH0221975 U JP H0221975U JP 10025788 U JP10025788 U JP 10025788U JP 10025788 U JP10025788 U JP 10025788U JP H0221975 U JPH0221975 U JP H0221975U
- Authority
- JP
- Japan
- Prior art keywords
- average value
- vertical synchronization
- period
- counter
- synchronization signal
- 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.)
- Pending
Links
Landscapes
- Synchronizing For Television (AREA)
- Television Signal Processing For Recording (AREA)
Description
第１図は本考案の一実施例を示す回路構成図、
第２図は従来における垂直同期検出回路の構成を
示す図である。
１１……５２５進カウンタ、１２ａ，１２ｂ…
…出力ライン、１３……フリツプフロツプ、１９
……一致判別回路、３１……可変カウンタ、３１
ａ，３１ｂ……出力ライン、３２……周期カウン
タ、３３……平均値演算回路。
FIG. 1 is a circuit diagram showing an embodiment of the present invention;
FIG. 2 is a diagram showing the configuration of a conventional vertical synchronization detection circuit. 11...525 decimal counter, 12a, 12b...
...Output line, 13...Flip-flop, 19
... Match determination circuit, 31 ... Variable counter, 31
a, 31b...Output line, 32...Period counter, 33...Average value calculation circuit.
Claims (1)
タと、この周期カウンタにより計測された周期の
所定数分の平均値を算出する平均値算出回路と、
基準周波数信号をカウントし、上記算出された平
均値に対応するカウント値となる毎に内部垂直同
期信号を出力する可変カウンタとを具備したこと
を特徴とする垂直同期検出回路。 a period counter that measures the period of an external vertical synchronization signal; an average value calculation circuit that calculates an average value for a predetermined number of periods measured by the period counter;
A vertical synchronization detection circuit comprising: a variable counter that counts reference frequency signals and outputs an internal vertical synchronization signal every time the count value corresponds to the calculated average value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10025788U JPH0221975U (en) | 1988-07-28 | 1988-07-28 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10025788U JPH0221975U (en) | 1988-07-28 | 1988-07-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0221975U true JPH0221975U (en) | 1990-02-14 |
Family
ID=31328177
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10025788U Pending JPH0221975U (en) | 1988-07-28 | 1988-07-28 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0221975U (en) |
-
1988
- 1988-07-28 JP JP10025788U patent/JPH0221975U/ja active Pending