Timing recovery for optical disc drive high frequency...

Details Timing recovery for optical disc drive high frequency... Timing recovery for optical disc drive high frequency...

2011-08-16

2011-08-16

Agustin, Peter Vincent (Department: 2627)

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Control of information signal processing channel

C369S053340

Reexamination Certificate

active

08000193

ABSTRACT:
A method and apparatus for recovering clock timing from a hi-phase modulated portion of an HFM signal. The signal includes transitions between high and low levels. A clock count is initiated upon detection of a first transition, which corresponds to an expected clock timing of the signal. The count is stopped upon detection of a second transition. An actual clock count includes a number of clock cycles occurring between the transitions based on the expected timing. A first expected clock count between transitions is identified if the actual clock count between the transitions falls within a first range of clock counts. A first error between the actual and first expected clock counts is determined. A second expected clock count between transitions is identified if the actual clock count between transitions falls within a second range of clock counts. A second error between the actual expected clock counts is determined.

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