Data pattern detection using adaptive search windows

Details Data pattern detection using adaptive search windows Data pattern detection using adaptive search windows

2011-08-02

2011-08-02

Wong, K. (Department: 2627)

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

C360S075000

Reexamination Certificate

active

07990646

ABSTRACT:
Method and apparatus for detecting a reference pattern in a transmitted bit sequence. A duration of a search window used to detect the reference pattern is adaptively adjusted in relation to a previous detection of the pattern. This is preferably carried out by using a first search window to initially detect the pattern, and then adjusting the first search window to provide a second search window to subsequently detect the pattern. Preferably, the search window is an elapsed period of time during which a transducer is swept adjacent a storage medium to detect the reference pattern. Servo data are preferably written as a sequence of adjacent spiral servo patterns, and the reference pattern is preferably detected each time to determine the relative location of the most recently written spiral. Preferably, a larger search window is used for initial spirals and a smaller search window is used for subsequently written spirals.

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