JPS6244577U - - Google Patents
Info
- Publication number
- JPS6244577U JPS6244577U JP13492885U JP13492885U JPS6244577U JP S6244577 U JPS6244577 U JP S6244577U JP 13492885 U JP13492885 U JP 13492885U JP 13492885 U JP13492885 U JP 13492885U JP S6244577 U JPS6244577 U JP S6244577U
- Authority
- JP
- Japan
- Prior art keywords
- horizontal synchronization
- circuit
- signal
- video
- synchronization 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
- 230000010355 oscillation Effects 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
Description
第１図は本考案の一実施例を示すブロツク図、
第２図はその各部の波形を示す図である。
１０……ビデオフロツピー（磁気デイスク）、
２２……同期分離回路（水平同期分離回路）、２
４……水平ＡＦＣ回路（水平同期発振回路）、２
６……一致度信号発生回路（判定回路）、３６…
…ゲートパルス発生回路（無効回路）。
FIG. 1 is a block diagram showing an embodiment of the present invention.
FIG. 2 is a diagram showing the waveforms of each part. 10...Video floppy (magnetic disk),
22... Synchronization separation circuit (horizontal synchronization separation circuit), 2
4...Horizontal AFC circuit (horizontal synchronous oscillation circuit), 2
6... Matching degree signal generation circuit (judgment circuit), 36...
...Gate pulse generation circuit (invalid circuit).
Claims (1)
信号が記録された磁気デイスクの再生装置に於い
て、 再生映像信号中の水平同期信号を取り出す水平
同期信号分離回路と、 この水平同期信号に同期した信号を出力する水
平同期発振回路と、 この水平同期発振回路出力と前記水平同期信号
を比較して映像信号の有無を判定する判定回路と
、 前記１フイールドの映像信号の始端を検出し、
この始端より前記水平同期発振回路の引き込み期
間に相当する間前記判定回路を不作動とする無効
回路とを、 備えることを特徴とする映像有無判定回路。[Scope of Claim for Utility Model Registration] In a magnetic disk playback device in which one field of video signals is recorded on each of a plurality of annular tracks, a horizontal synchronization signal separation circuit for extracting a horizontal synchronization signal from a playback video signal; a horizontal synchronization oscillation circuit that outputs a signal synchronized with a horizontal synchronization signal; a determination circuit that compares the output of the horizontal synchronization oscillation circuit with the horizontal synchronization signal to determine the presence or absence of a video signal; and a starting end of the video signal of the one field. detect,
A video presence/absence determination circuit comprising: an invalidation circuit that disables the determination circuit for a period corresponding to a pull-in period of the horizontal synchronization oscillation circuit from this start end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13492885U JPH0453099Y2 (en) | 1985-09-03 | 1985-09-03 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13492885U JPH0453099Y2 (en) | 1985-09-03 | 1985-09-03 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6244577U true JPS6244577U (en) | 1987-03-18 |
| JPH0453099Y2 JPH0453099Y2 (en) | 1992-12-14 |
Family
ID=31036631
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13492885U Expired JPH0453099Y2 (en) | 1985-09-03 | 1985-09-03 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0453099Y2 (en) |
-
1985
- 1985-09-03 JP JP13492885U patent/JPH0453099Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0453099Y2 (en) | 1992-12-14 |
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