JPS59180567U - detection circuit - Google Patents
detection circuitInfo
- Publication number
- JPS59180567U JPS59180567U JP1983073822U JP7382283U JPS59180567U JP S59180567 U JPS59180567 U JP S59180567U JP 1983073822 U JP1983073822 U JP 1983073822U JP 7382283 U JP7382283 U JP 7382283U JP S59180567 U JPS59180567 U JP S59180567U
- Authority
- JP
- Japan
- Prior art keywords
- signal
- detection circuit
- gate period
- counting
- synchronizing 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.)
- Granted
Links
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図は本考案の一実施例を示す概略プロ゛シク図、第
２図ａは垂直同期信号が水平同期信号を２６４個カウン
トするより遅く入力された時（ＶＴＲ特殊再生時）の検
出回路の動作を説明するための波形図、第２図すは垂直
同期信号が水平パルス信号を２６１個カウントするより
早く入力された時（ＶＴＲ特殊再生時）の検出回路の動
作を説明するための波形図、第２図Ｃは、垂直同期信号
が水平パルス信号を２６１個カウントするより遅く且つ
２６４個カウントするより早く入力された時（正規のテ
レビジョン信号受信時）の検出回路の動作を説明するた
めの波形図、第３図は第１図の具体的な回路例を示す概
略図である。
３・・・カウント手段、５． ６． ７・・・ゲート信
号発生手段、８・・・検出手段。Figure 1 is a schematic diagram showing an embodiment of the present invention, and Figure 2a is a detection circuit when the vertical synchronization signal is input later than counting 264 horizontal synchronization signals (during VTR special playback). Figure 2 is a waveform diagram to explain the operation of the detection circuit when the vertical synchronizing signal is input earlier than counting 261 horizontal pulse signals (during VTR special playback). Figure 2C explains the operation of the detection circuit when the vertical synchronizing signal is input later than counting 261 horizontal pulse signals and earlier than counting 264 horizontal pulse signals (when receiving a regular television signal). FIG. 3 is a schematic diagram showing a specific example of the circuit shown in FIG. 1. 3... counting means, 5. 6. 7... Gate signal generation means, 8... Detection means.
Claims (1)
パルスを所定数カウントした時、信号を出力するカウン
ト手段と、前記カウント手探の出力信号により特定の幅
のゲート期間を設定するゲート期間設定手段と、前記ゲ
ート期間中に垂直同期信号が存在するか否かを検出する
検出手段とよりなることを特徴とする検出回路。a counting means for outputting a signal when a predetermined number of pulses set by the vertical synchronizing signal and synchronized with the horizontal synchronizing signal are counted; and a gate period setting means for setting a gate period of a specific width by the output signal of the counting circuit. . A detection circuit comprising: detection means for detecting whether or not a vertical synchronization signal is present during the gate period.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1983073822U JPS59180567U (en) | 1983-05-18 | 1983-05-18 | detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1983073822U JPS59180567U (en) | 1983-05-18 | 1983-05-18 | detection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59180567U true JPS59180567U (en) | 1984-12-03 |
| JPH0441662Y2 JPH0441662Y2 (en) | 1992-09-30 |
Family
ID=30203935
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1983073822U Granted JPS59180567U (en) | 1983-05-18 | 1983-05-18 | detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59180567U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56104577A (en) * | 1980-01-24 | 1981-08-20 | Sony Corp | Field distinction circuit |
-
1983
- 1983-05-18 JP JP1983073822U patent/JPS59180567U/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56104577A (en) * | 1980-01-24 | 1981-08-20 | Sony Corp | Field distinction circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0441662Y2 (en) | 1992-09-30 |
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