JPH0292284U - - Google Patents
Info
- Publication number
- JPH0292284U JPH0292284U JP1988170149U JP17014988U JPH0292284U JP H0292284 U JPH0292284 U JP H0292284U JP 1988170149 U JP1988170149 U JP 1988170149U JP 17014988 U JP17014988 U JP 17014988U JP H0292284 U JPH0292284 U JP H0292284U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- synchronization
- signal
- synchronization signal
- horizontal
- 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
- 230000010355 oscillation Effects 0.000 claims description 5
- 238000000926 separation method Methods 0.000 claims description 4
- 230000001360 synchronised effect Effects 0.000 claims description 2
- 239000002131 composite material Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Synchronizing For Television (AREA)
- Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
Description
第１図は、この考案の同期信号判別装置の一実
施例を示す回路構成図、第２，３図は、ともに第
１図に示した回路各部の信号波形図、第４図は、
従来の同期信号判別装置の一例を示す回路構成図
である。
２……同期分離回路、３……水平発振回路、１
１……同期信号判別装置、１２……シフトレジス
タ回路、１３，１４……アンドゲート回路。
FIG. 1 is a circuit configuration diagram showing an embodiment of the synchronization signal discrimination device of this invention, FIGS. 2 and 3 are signal waveform diagrams of each part of the circuit shown in FIG. 1, and FIG.
FIG. 1 is a circuit configuration diagram showing an example of a conventional synchronization signal discriminating device. 2...Synchronization separation circuit, 3...Horizontal oscillation circuit, 1
1... Synchronous signal discrimination device, 12... Shift register circuit, 13, 14... AND gate circuit.
Claims (1)
分離回路と、この同期分離回路が分離した水平同
期信号に同期して発振する水平発振回路と、この
水平発振回路の水平発振出力をクロツク信号とし
て、前記同期分離回路が分離した水平同期信号を
ラツチするシフトレジスタ回路と、このシフトレ
ジスタ回路の複数の出力の一致又は不一致をもつ
て同期信号品位を判別する論理回路とを具備する
同期信号判別装置。 (2) 垂直同期信号期間において、前記シフトレ
ジスタ回路に対してクロツク信号である水平発振
出力の供給を禁止するゲート回路を設けてなる請
求項１記載の同期信号判別装置。[Claims for Utility Model Registration] (1) A synchronization separation circuit that separates a synchronization signal from a composite video signal, a horizontal oscillation circuit that oscillates in synchronization with the horizontal synchronization signal separated by this synchronization separation circuit, and this horizontal oscillation circuit. a shift register circuit that uses the horizontal oscillation output of the clock signal as a clock signal to latch the horizontal synchronization signal separated by the synchronization separation circuit; and a logic circuit that determines the quality of the synchronization signal based on the coincidence or mismatch of a plurality of outputs of the shift register circuit. A synchronous signal discrimination device comprising: (2) The synchronization signal discriminating device according to claim 1, further comprising a gate circuit for prohibiting the supply of a horizontal oscillation output, which is a clock signal, to the shift register circuit during a vertical synchronization signal period.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988170149U JPH0292284U (en) | 1988-12-29 | 1988-12-29 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988170149U JPH0292284U (en) | 1988-12-29 | 1988-12-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0292284U true JPH0292284U (en) | 1990-07-23 |
Family
ID=31460839
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988170149U Pending JPH0292284U (en) | 1988-12-29 | 1988-12-29 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0292284U (en) |
-
1988
- 1988-12-29 JP JP1988170149U patent/JPH0292284U/ja active Pending