Optical disk apparatus capable of generating clock accurately

Details Optical disk apparatus capable of generating clock accurately Optical disk apparatus capable of generating clock accurately

2005-12-13

2005-12-13

Dinh, Tan (Department: 2653)

Dynamic information storage or retrieval

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Control of information signal processing channel

C369S053340, C369S059170

Reexamination Certificate

active

06975569

ABSTRACT:
A digital signal processor (1045) arithmetically determines a comparison level for comparing each signal component by determining a comparison level of comparators (1033and1034) for comparing a fine clock mark signal such that a larger weight is assigned to the comparison level of the signal component already compared. The comparators (1033and1034) compare the fine clock mark signal with reference to a level set on a peak side and a level set on a bottom side. When digital signal processor (1045) receives the comparison signal from one of the comparators (1033and1034) prior to the comparison signal sent from the other, the digital signal processor produces a fine clock mark detection signal FCMT based on the comparison signal sent from a comparator (1047). Thereby, the clock can be accurately produced based on the fine clock mark signal even when a signal component having a larger amplitude than that of the fine clock mark signal is detected.

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