JPH0243084U - - Google Patents
Info
- Publication number
- JPH0243084U JPH0243084U JP1988122459U JP12245988U JPH0243084U JP H0243084 U JPH0243084 U JP H0243084U JP 1988122459 U JP1988122459 U JP 1988122459U JP 12245988 U JP12245988 U JP 12245988U JP H0243084 U JPH0243084 U JP H0243084U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- detection circuit
- outputs
- monomulti
- output
- 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
- 238000001514 detection method Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000000926 separation method Methods 0.000 description 2
Landscapes
- Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
Description
第１図は本考案の一実施例を示す図、第２図、
第３図は各部の波形を示す図である。第４図は従
来のＡＦＣ検波回路方式の図、第５図はピーキン
グ回路方式の図、第６図は簡易方式の図、第７図
は水平同期分離回路の一例を示す図である。
１０……同期分離回路、２０……モノマルチ回
路、１６……検波回路、１８……比較回路。
Fig. 1 shows an embodiment of the present invention; Fig. 2;
FIG. 3 is a diagram showing waveforms at various parts. FIG. 4 is a diagram of a conventional AFC detection circuit system, FIG. 5 is a diagram of a peaking circuit system, FIG. 6 is a diagram of a simplified system, and FIG. 7 is a diagram of an example of a horizontal synchronization separation circuit. 10... Synchronization separation circuit, 20... Mono multi circuit, 16... Detection circuit, 18... Comparison circuit.
Claims (1)
期分離回路１０と、 この同期分離回路１０の出力により動作し一定
幅のパルス信号を出力するモノマルチ回路２０と
、 このモノマルチ回路２０からの、パルス信号を
直流検波する検波回路１６と、 この検波回路１６の出力と基準レベルとを比較
する比較回路１８と、 を備えることを特徴とする入力映像信号の有無
検出回路。[Claims for Utility Model Registration] A sync separator circuit 10 that receives a video signal and outputs a horizontal synchronizing signal; a monomulti circuit 20 that operates based on the output of the sync separator circuit 10 and outputs a pulse signal of a constant width; A detection circuit for detecting the presence or absence of an input video signal, comprising: a detection circuit 16 that DC-detects a pulse signal from a monomulti circuit 20; and a comparison circuit 18 that compares the output of the detection circuit 16 with a reference level. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988122459U JPH0243084U (en) | 1988-09-19 | 1988-09-19 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988122459U JPH0243084U (en) | 1988-09-19 | 1988-09-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0243084U true JPH0243084U (en) | 1990-03-26 |
Family
ID=31370412
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988122459U Pending JPH0243084U (en) | 1988-09-19 | 1988-09-19 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0243084U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5445524A (en) * | 1977-09-17 | 1979-04-10 | Sharp Corp | Signal discrimination circuit for automatic channel selector |
| JPS61292482A (en) * | 1985-06-19 | 1986-12-23 | Mitsubishi Electric Corp | Device for deciding existence/absence of video signal |
-
1988
- 1988-09-19 JP JP1988122459U patent/JPH0243084U/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5445524A (en) * | 1977-09-17 | 1979-04-10 | Sharp Corp | Signal discrimination circuit for automatic channel selector |
| JPS61292482A (en) * | 1985-06-19 | 1986-12-23 | Mitsubishi Electric Corp | Device for deciding existence/absence of video signal |
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