JPS62146379U - - Google Patents
Info
- Publication number
- JPS62146379U JPS62146379U JP3434786U JP3434786U JPS62146379U JP S62146379 U JPS62146379 U JP S62146379U JP 3434786 U JP3434786 U JP 3434786U JP 3434786 U JP3434786 U JP 3434786U JP S62146379 U JPS62146379 U JP S62146379U
- Authority
- JP
- Japan
- Prior art keywords
- test pattern
- signal
- input terminal
- video
- terminal
- 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
- 239000003990 capacitor Substances 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
Description
第１図はこの考案のＶＴＲのビデオ信号、テス
トパターン信号切換回路を示す回路図、第２図は
従来のＶＴＲのビデオ信号、テストパターン信号
切換回路を示す回路図である。
１：ビデオ入力端子、２：テストパターン入力
端子、３：テストパターン発生器、４：直流阻止
用コンデンサ、５，６，７，１３，２２：抵抗器
、８：直流阻止用コンデンサ、９：信号出力端子
、１０：電源入力端子、１１：トランジスタ、１
２：電源出力端子、１４：コンデンサ、２０：Ｆ
ＥＴ、２１：スイツチ。
FIG. 1 is a circuit diagram showing a video signal/test pattern signal switching circuit for a VTR of this invention, and FIG. 2 is a circuit diagram showing a video signal/test pattern signal switching circuit for a conventional VTR. 1: Video input terminal, 2: Test pattern input terminal, 3: Test pattern generator, 4: DC blocking capacitor, 5, 6, 7, 13, 22: Resistor, 8: DC blocking capacitor, 9: Signal Output terminal, 10: Power input terminal, 11: Transistor, 1
2: Power output terminal, 14: Capacitor, 20: F
ET, 21: Switch.
Claims (1)
トパターン入力端子に与えられるテストパターン
信号とのいずれかを選択して信号出力端子に供給
すると共に、電源入力端子に与えられる電圧を、
上記テストパターン信号が選択された期間のみ、
電源出力端子を介してテストパターン発生器へ供
給するＶＴＲのビデオ信号、テストパターン信号
切換回路において、 上記ビデオ入力端子と上記信号出力端子との間
に、ゲート電圧がゼロボルトでオンとなり、上記
電源入力端子の電圧がゲートに印加されるとオフ
するＦＥＴが接続され、 上記テストパターン入力端子と上記信号出力端
子との間に常に信号伝送可能な信号通路が設けら
れ、 上記電源入力端子と上記電源出力端子との間に
スイツチが設けられ、 上記電源入力端子は上記スイツチを介して上記
ＦＥＴのゲートに接続され、 上記スイツチのオン、オフに対応してそれぞれ
上記テストパターン信号、上記ビデオ信号が選択
されて出力されることを特徴とするＶＴＲのビデ
オ信号、テストパターン信号切換回路。[Claims for Utility Model Registration] Select either the video signal applied to the video input terminal or the test pattern signal applied to the test pattern input terminal and supply it to the signal output terminal, and the voltage applied to the power supply input terminal. of,
Only during the period when the above test pattern signal is selected.
In the VTR video signal and test pattern signal switching circuit that supplies the test pattern generator via the power supply output terminal, the gate voltage is turned on at zero volts between the video input terminal and the signal output terminal, and the power supply input A FET that turns off when a terminal voltage is applied to the gate is connected, a signal path that can always transmit signals is provided between the test pattern input terminal and the signal output terminal, and the power supply input terminal and the power output A switch is provided between the input terminal and the power input terminal, and the power input terminal is connected to the gate of the FET via the switch, and the test pattern signal and video signal are selected in response to turning on and off the switch. A video signal/test pattern signal switching circuit for a VTR, characterized in that the circuit outputs a video signal and a test pattern signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3434786U JPH0424701Y2 (en) | 1986-03-10 | 1986-03-10 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3434786U JPH0424701Y2 (en) | 1986-03-10 | 1986-03-10 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62146379U true JPS62146379U (en) | 1987-09-16 |
| JPH0424701Y2 JPH0424701Y2 (en) | 1992-06-11 |
Family
ID=30842808
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3434786U Expired JPH0424701Y2 (en) | 1986-03-10 | 1986-03-10 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0424701Y2 (en) |
-
1986
- 1986-03-10 JP JP3434786U patent/JPH0424701Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0424701Y2 (en) | 1992-06-11 |