Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1997-10-24
2000-05-02
Huber, Paul W.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4425, 369 58, G11B 700
Patent
active
060580828
ABSTRACT:
A digital versatile disc (DVD) system compatible with a compact disc (CD), a single-layered DVD and a multi-layered DVD having respectively different structures. The DVD system discriminates a type of a disc loaded on a turntable according to the number of detections and magnitudes represented by reflection characteristic curves of a focus error signal detected during performing an initial focus search operation for the disc. In case the disc is a compact disc (CD) of 1.2 mm thickness, a focus error signal detected during performing a focus search of the disc is indicated as a reflection characteristic curve of a level between predetermined two reference values. In case of a DVD of 0.6 mm thickness, a single-layered structure is indicated as a reflection characteristic curve having a larger level than the two reference values, and a multi-layered structure is indicated as two reflection characteristic curves having a level between the two reference values, respectively. Using the above characteristics, the type of a disc is discriminated by checking the size and number of times of the reflection characteristic curves of the focus error signal obtained in the focus-up state during performing an initial focus search. Also, since a detection time of the focus error signal is checked, the type of a disc is more accurately discriminated. The present invention quickly discriminates the type of the CD and DVD, thereby providing an effect that error caused during performing a playback operation can be reduced in the DVD system compatible with the DVD and the CD.
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Huber Paul W.
Samsung Electronics Co,. Ltd.
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