JPS6355250U - - Google Patents
Info
- Publication number
- JPS6355250U JPS6355250U JP15011886U JP15011886U JPS6355250U JP S6355250 U JPS6355250 U JP S6355250U JP 15011886 U JP15011886 U JP 15011886U JP 15011886 U JP15011886 U JP 15011886U JP S6355250 U JPS6355250 U JP S6355250U
- Authority
- JP
- Japan
- Prior art keywords
- reproduction
- video
- signal
- horizontal synchronization
- servo loop
- 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 3
- 230000003287 optical effect Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
Landscapes
- Rotational Drive Of Disk (AREA)
Description
図は、本考案の一実施例によるビデオデイスク
装置の主要な構成を示すブロツク図である。
１０……ＤＲＡＷ光デイスク、１２……スピン
ドルモータ、１４……光学ヘツド、２４……垂直
同期信号分離回路、２６……増幅器、２８……１
／２分周器、３０……位相比較器、３２……位相
補償回路、３４……差動増幅器、３６……増幅器
、３８……Ｆ―Ｖ変換器、４０……位相補償回路
、４２……位置―周波数変換器、４４……位相比
較器、４８……切替スイツチ、５８……水平周期
信号分離回路、６０……位相比較器、６２……基
準同期信号発生回路、６６……切替スイツチ、６
８……検波器、７０……アンドゲート。
FIG. 1 is a block diagram showing the main structure of a video disc device according to an embodiment of the present invention. 10...DRAW optical disk, 12...Spindle motor, 14...Optical head, 24...Vertical synchronization signal separation circuit, 26...Amplifier, 28...1
/2 frequency divider, 30... phase comparator, 32... phase compensation circuit, 34... differential amplifier, 36... amplifier, 38... F-V converter, 40... phase compensation circuit, 42... ...position-frequency converter, 44 ... phase comparator, 48 ... changeover switch, 58 ... horizontal periodic signal separation circuit, 60 ... phase comparator, 62 ... reference synchronization signal generation circuit, 66 ... changeover switch ,6
8...Detector, 70...And gate.
Claims (1)
スクを使用し、記録時に前記ビデオデイスクを所
定の速度で回転させるようスピンドルモータの回
転を制御する記録サーボループと、再生時に再生
映像信号より分離される再生水平同期信号を基準
水平同期信号と位相比較し、その比較誤差に応じ
て前記スピンドルモータの回転を制御する再生サ
ーボループとを備えたビデオデイスク装置におい
て、 再生時に前記再生水平同期信号が正常に得られ
ないとき、そのことを検出して所定の検出信号を
発生する検出手段と、 前記検出信号に応動して前記再生サーボループ
を前記記録サーボループに切り替えて前記スピン
ドルモータの回転を制御せしめるサーボループ切
替手段と、 を具備することを特徴とするビデオデイスク装置
。 (2) 前記検出手段は、再生信号のエンベロープ
レベルに基づいて前記検出信号を発生する検波器
からなる、実用新案登録請求の範囲第１項に記載
のビデオデイスク装置。[Claims for Utility Model Registration] (1) A recording servo loop that uses a writable video disk as a recording medium and controls the rotation of a spindle motor so that the video disk rotates at a predetermined speed during recording, and A video disc apparatus comprising a reproduction servo loop that compares the phase of a reproduction horizontal synchronization signal separated from a reproduction video signal with a reference horizontal synchronization signal and controls the rotation of the spindle motor according to the comparison error, detecting means for detecting when a reproduction horizontal synchronization signal is not normally obtained and generating a predetermined detection signal; A video disc device comprising: servo loop switching means for controlling rotation of a motor; (2) The video disc device according to claim 1, wherein the detection means comprises a detector that generates the detection signal based on the envelope level of the reproduced signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15011886U JPS6355250U (en) | 1986-09-30 | 1986-09-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15011886U JPS6355250U (en) | 1986-09-30 | 1986-09-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6355250U true JPS6355250U (en) | 1988-04-13 |
Family
ID=31065964
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15011886U Pending JPS6355250U (en) | 1986-09-30 | 1986-09-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6355250U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6437764A (en) * | 1987-07-31 | 1989-02-08 | Sharp Kk | Optical disk recording and reproducing device |
-
1986
- 1986-09-30 JP JP15011886U patent/JPS6355250U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6437764A (en) * | 1987-07-31 | 1989-02-08 | Sharp Kk | Optical disk recording and reproducing device |
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