High-density disk recording medium and apparatus and method...

Details High-density disk recording medium and apparatus and method... High-density disk recording medium and apparatus and method...

2007-01-02

2007-01-02

Hindi, Nabil (Department: 2627)

Dynamic information storage or retrieval

Binary pulse train information signal

Having specific code or form generation or regeneration...

C369S059210

Reexamination Certificate

active

10635572

ABSTRACT:
The present invention relates to a disk recording medium such as a CD or a DVD in which data is recorded in high-density, and method and apparatus for reproducing data recorded in the high-density disk recording medium. The data reproducing method and apparatus according to the present invention converts a high-frequency signal reproduced from the disk into a plurality of binary signals through comparing the reproduced signal with two or more slicing levels which are different each other, selects one of the plurality of binary signals or a periodic pulse signal based on the difference magnitude between the plurality of binary signals, synchronizes a reference clock with the selected signal, and restores the selected signal into bit stream using the synchronized reference clock. This method and apparatus enables mark or pit and/or space shorter than the radius of a reproducing beam spot to be restored into corresponding bit train, therefore, enhancing the recording capacity of a track formed on an optical disk.

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patent: 11-7668 (1999-01-01), None

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