Dynamic magnetic information storage or retrieval – General processing of a digital signal
Reexamination Certificate
2006-02-28
2006-02-28
Hudspeth, David (Department: 2651)
Dynamic magnetic information storage or retrieval
General processing of a digital signal
C360S075000, C360S078140, C360S031000, C360S051000, C360S055000
Reexamination Certificate
active
07006312
ABSTRACT:
Methods are provided for improving servo-demodulation robustness. A SAM pattern is searched for in a servo wedge. If the SAM pattern is detected in the first servo wedge, a determination is made whether to characterize the detection of the SAM pattern as either a good SAM detection or a bad SAM detection. If the detection of the SAM pattern is characterized as a good SAM detection, at least one channel control value (e.g., servo AGC and/or PLL values) associated with the first servo wedge is used as a starting channel control value (or to predict a starting channel control value) when beginning to read a next servo wedge. However, if the SAM pattern is not detected, or a SAM detection is characterized as bad, at least one previously stored channel control value is used as a starting channel control value (or to predict a starting channel control value) when beginning to read the next servo wedge.
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Fliesler & Meyer LLP
Hudspeth David
Matsushita Electic Industrial Co. Ltd.
Mercedes Dismery
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