Optical disk device

Details Optical disk device Optical disk device

1998-12-15

2001-03-20

Edun, Muhammad (Department: 2651)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S047360, C369S059160

Reexamination Certificate

active

06205095

ABSTRACT:

TECHNICAL FIELD
The present invention relates to an optical disk device, and more specifically to a regenerated signal process in which a transfer rate can be variable.
BACKGROUND ART
With high-speed regeneration of recent optical disk media such as CD-ROM, DVD, etc., regenerating data in synchronization with data PLL independent of a transfer rate, that is, so-called jitter-free regeneration, is indispensable for improving access speed in the high-speed CAV regeneration (with constant motor revolution) and the CLV regeneration (with constant regeneration speed).
In the jitter-free regeneration, the features in the settings of a filter and an equalizer, the responsiveness of an AGC circuit, the responsiveness of a binary circuit, etc. are variable depending on a transfer rate, and are deteriorated in jitter margin, thereby requiring an operation of varying the setting or responsiveness depending on the transfer rate.
To solve the above described problem, a whole disk is divided into a plurality of zones depending on a data address to vary the settings and the responsiveness for each zone in the conventional CAV regenerating technology, or a transfer rate is computed from the width of a special pattern of binary data to vary the above described settings and the responsiveness depending on the result in the conventional CLV regenerating technology.
With the above described conventional configuration, it is necessary to divide a disk into a number of zones to obtain the optimum settings, thereby largely increasing the number of processes and the management scale. Furthermore, additional circuits such as a circuit for detecting a transfer rate are required. In addition, processes cannot be performed on writable media such as DVD-RAM, etc., especially on an unwritten area.
DISCLOSURE OF THE INVENTION
The optical disk device according to the present invention includes optical means for extracting information stored on a disk, signal process means for optimally converting a regenerated signal extracted by the optical means into a binary signal, and reference clock generation means for generating a reference clock having a transfer speed close to the basic transfer speed of the regenerated signal from a fixed clock. The basic clock generation means is designed to optimally vary the features in the settings of a filter and an equalizer, the responsiveness of an AGC circuit, the responsiveness of a binary circuit, etc. of the signal process means depending on the oscillation frequency of a voltage or current control oscillator built in to generate a reference clock.
Thus, the present invention guarantees the optimum signal process characteristics and the stable loop characteristics of the clock oscillation circuit depending on the oscillation frequency of a reference clock.
Furthermore, the present invention realizes the optimum signal process characteristics depending on a current transfer rate even if it is a variable transfer rate, so that more stable data can be regenerated.


REFERENCES:
patent: 5278814 (1994-01-01), Deguchi et al.
patent: 5815476 (1998-09-01), Inagawa et al.
patent: 6069854 (2000-05-01), Koudo et al.

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