Apparatus for detecting a pre-pit signal

Details Apparatus for detecting a pre-pit signal Apparatus for detecting a pre-pit signal

2007-03-27

2007-03-27

Hindi, Nabil (Department: 2627)

Dynamic information storage or retrieval

Binary pulse train information signal

Binary signal multiplexing or demultiplexing

C369S124100, C369S047270, C369S047200

Reexamination Certificate

active

10676008

ABSTRACT:
An apparatus for detecting a pre-pit signal at different laser power intensities of an optical disk drive. The apparatus includes an amplifier for receiving a push-pull signal acquired from an optical disk to generate an adjusted signal, a multiplexer for receiving the push-pull signal and the adjusted signal and selecting the push-pull signal or the adjusted signal as a slicing signal for output according to a power state signal, and a slicer for receiving the slicing signal and slicing the slicing signal according to a slicing level to generate the pre-pit signal. Thus, the apparatus only needs one set of slicer to correctly slice the pre-pit signal.

REFERENCES:
patent: 5930222 (1999-07-01), Yoshida et al.
patent: 6122331 (2000-09-01), Dumas et al.
patent: 6992956 (2006-01-01), Minechika et al.
patent: 2002-74675 (2002-03-01), None

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