JPH0436381U - - Google Patents
Info
- Publication number
- JPH0436381U JPH0436381U JP7909490U JP7909490U JPH0436381U JP H0436381 U JPH0436381 U JP H0436381U JP 7909490 U JP7909490 U JP 7909490U JP 7909490 U JP7909490 U JP 7909490U JP H0436381 U JPH0436381 U JP H0436381U
- Authority
- JP
- Japan
- Prior art keywords
- phase comparison
- magnetic recording
- locked loop
- image memory
- certain range
- 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
- 238000010586 diagram Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 2
Landscapes
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
- Television Signal Processing For Recording (AREA)
Description
第１図は、この考案の磁気記録再生装置の一実
施例を示す回路構成図、第２図は、第１図に示し
た回路各部の信号波形図、第３図は、従来の磁気
記録再生装置の一例を示す回路構成図、第４図は
、第３図に示した回路各部の信号波形図である。
２……フイールドメモリ、６……切り替えスイ
ツチ、９……ドロツプアウト検出回路、１２……
フイールドメモリ制御回路、２０……位相ロツク
ドループ回路、３１……磁気記録再生装置、３２
……位相差検出回路。
Fig. 1 is a circuit configuration diagram showing one embodiment of the magnetic recording/reproducing device of this invention, Fig. 2 is a signal waveform diagram of each part of the circuit shown in Fig. 1, and Fig. 3 is a conventional magnetic recording/reproducing device. FIG. 4, a circuit configuration diagram showing an example of the device, is a signal waveform diagram of each part of the circuit shown in FIG. 3. 2... Field memory, 6... Changeover switch, 9... Dropout detection circuit, 12...
Field memory control circuit, 20... Phase locked loop circuit, 31... Magnetic recording and reproducing device, 32
...Phase difference detection circuit.
Claims (1)
伴つて発生するノイズバーを、画像メモリに書き
込んでおいた任意のフイールド期間前の再生映像
信号をもつて置換する磁気記録再性装置であつて
、前記再生映像信号から抽出される再生同期信号
を用い、前記画像メモリのための動作クロツクを
生成する位相ロツクドループ回路と、この位相ロ
ツクドループ回路の出力と前記再生同期信号とを
位相比較し、位相比較誤差が一定範囲を越える間
は、前記ドロツプアウト期間が終了しても前記置
換を継続し、位相比較誤差が一定範囲内に落ち着
いた時点で前記置換を停止する手段を具備する磁
気記録再生装置。 A magnetic recording and reproducing device that replaces noise bars generated as a magnetic head crosses tracks during even-numbered speed reproduction with a reproduced video signal written in an image memory and recorded before an arbitrary field period, wherein the reproduced video A phase locked loop circuit generates an operation clock for the image memory using a reproduction synchronization signal extracted from the signal, and a phase comparison is made between the output of this phase locked loop circuit and the reproduction synchronization signal, and the phase comparison error is within a certain range. The magnetic recording/reproducing apparatus further comprises means for continuing the replacement even after the dropout period ends, and for stopping the replacement when the phase comparison error settles within a certain range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7909490U JPH0436381U (en) | 1990-07-25 | 1990-07-25 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7909490U JPH0436381U (en) | 1990-07-25 | 1990-07-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0436381U true JPH0436381U (en) | 1992-03-26 |
Family
ID=31622951
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7909490U Pending JPH0436381U (en) | 1990-07-25 | 1990-07-25 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0436381U (en) |
-
1990
- 1990-07-25 JP JP7909490U patent/JPH0436381U/ja active Pending
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