Duty ratio control apparatus for pre-pit detection or header...

Details Duty ratio control apparatus for pre-pit detection or header... Duty ratio control apparatus for pre-pit detection or header...

2005-09-28

2009-11-03

Huber, Paul (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S124070

Reexamination Certificate

active

07613093

ABSTRACT:
A pre-pit signal generating device includes: a first slicer for generating a sliced signal corresponding to a push-pull signal based on a first reference level; a duty ratio controller coupled to the first slicer for adjusting the first reference level or the push-pull signal to control a duty ratio of the sliced signal to a predetermined ratio; a reference level generator coupled to the duty ratio controller for generating a second reference level corresponding to the first reference level; and a second slicer coupled to the reference level generator for generating a first pre-pit signal corresponding to the push-pull signal based on the second reference level.

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