JPS6424533U - - Google Patents
Info
- Publication number
- JPS6424533U JPS6424533U JP12015487U JP12015487U JPS6424533U JP S6424533 U JPS6424533 U JP S6424533U JP 12015487 U JP12015487 U JP 12015487U JP 12015487 U JP12015487 U JP 12015487U JP S6424533 U JPS6424533 U JP S6424533U
- Authority
- JP
- Japan
- Prior art keywords
- signal
- position detection
- envelope
- count value
- estimated value
- 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 6
Description
第１図は本考案に係る無信号位置検出回路を示
すブロツク図、第２図は磁気テープ上の映像トラ
ツクを示す図、第３図はヘツド再生出力の波形図
、第４図はエンベロープ出力の波形図、第５図は
パルス信号の波形図である。
１，２……磁気ヘツド、５……検波回路、７…
…コンパレータ、８……カウンター、９……演算
処理回路、Ｙ……エンベロープ出力。
Fig. 1 is a block diagram showing a no-signal position detection circuit according to the present invention, Fig. 2 is a diagram showing a video track on a magnetic tape, Fig. 3 is a waveform diagram of the head playback output, and Fig. 4 is a diagram of the envelope output. Waveform diagram: FIG. 5 is a waveform diagram of a pulse signal. 1, 2...Magnetic head, 5...Detection circuit, 7...
...Comparator, 8...Counter, 9...Arithmetic processing circuit, Y...Envelope output.
Claims (1)
具えたヘリカルスキヤン方式のＶＴＲに於いて、
高速再生モードにて磁気ヘツドの再生出力Ｘから
エンベロープを検出する検波手段と、該エンベロ
ープ出力Ｙの交番周波数に応じた周波数を有する
パルス信号Ｐを作成するパルス作成手段と、前記
パルス信号Ｐを所定の周期でカウントする計数手
段と、該カウント値ＣＴが入力された演算処理手
段とから構成され、該演算処理手段は、前記カウ
ント値ＣＴと、磁気テープの信号記録部を再生し
たときに得られるべきカウント値の最小推定値Ｍ
とを比較し、カウント値ＣＴが最小推定値Ｍを下
回つたとき、無信号位置検出信号Ｚを作成して出
力することを特徴とするＶＴＲの無信号位置検出
回路。 In a helical scan VTR equipped with a pair of rotating magnetic heads with different azimuth angles,
a detection means for detecting an envelope from the reproduction output X of the magnetic head in high-speed reproduction mode; a pulse generation means for generating a pulse signal P having a frequency corresponding to the alternating frequency of the envelope output Y; It is composed of a counting means that counts at a cycle of Minimum estimated value M of power count value
A no-signal position detection circuit for a VTR, characterized in that when a count value CT falls below a minimum estimated value M, a no-signal position detection signal Z is generated and outputted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12015487U JPS6424533U (en) | 1987-08-05 | 1987-08-05 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12015487U JPS6424533U (en) | 1987-08-05 | 1987-08-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6424533U true JPS6424533U (en) | 1989-02-09 |
Family
ID=31366011
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12015487U Pending JPS6424533U (en) | 1987-08-05 | 1987-08-05 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6424533U (en) |
-
1987
- 1987-08-05 JP JP12015487U patent/JPS6424533U/ja active Pending
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