JPH02141129U - - Google Patents
Info
- Publication number
- JPH02141129U JPH02141129U JP5103189U JP5103189U JPH02141129U JP H02141129 U JPH02141129 U JP H02141129U JP 5103189 U JP5103189 U JP 5103189U JP 5103189 U JP5103189 U JP 5103189U JP H02141129 U JPH02141129 U JP H02141129U
- Authority
- JP
- Japan
- Prior art keywords
- connect
- switching transistor
- monostable multivibrator
- input
- time constant
- 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
- 238000000926 separation method Methods 0.000 claims description 2
- 230000001360 synchronised effect Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
- Manipulation Of Pulses (AREA)
Description
第１図は本考案の実施例を示す電気回路図、第
２図は同実施例の動作波形図である。
１は同期分離回路、３は単安定マルチバイブレ
ータである。
FIG. 1 is an electric circuit diagram showing an embodiment of the present invention, and FIG. 2 is an operational waveform diagram of the embodiment. 1 is a synchronous separation circuit, and 3 is a monostable multivibrator.
Claims (1)
トランジスタのベースへ接続し、同スイツチング
用トランジスタの抵抗負荷のコレクタと単安定マ
ルチバイブレータの入力端子とを接続し、同単安
定マルチバイブレータの外部接続時定数端子の時
定数を前記スイツチング用トランジスタのベース
入力水平同期信号の水平走査周期（１Ｈ）より長
くして、前記単安定マルチバイブレータ出力パル
ス信号のＨレベルあるいはＬレベルにより入力映
像信号の有無を検出してなる映像信号判別回路。 Connect the synchronous separation circuit output of the video equipment to the base of the switching transistor, connect the resistive load collector of the switching transistor to the input terminal of the monostable multivibrator, and connect the external connection time constant terminal of the monostable multivibrator. The time constant of is made longer than the horizontal scanning period (1H) of the base input horizontal synchronizing signal of the switching transistor, and the presence or absence of the input video signal is detected based on the H level or L level of the monostable multivibrator output pulse signal. A video signal discrimination circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5103189U JPH02141129U (en) | 1989-04-28 | 1989-04-28 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5103189U JPH02141129U (en) | 1989-04-28 | 1989-04-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02141129U true JPH02141129U (en) | 1990-11-27 |
Family
ID=31570102
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5103189U Pending JPH02141129U (en) | 1989-04-28 | 1989-04-28 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02141129U (en) |
-
1989
- 1989-04-28 JP JP5103189U patent/JPH02141129U/ja active Pending
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