| 摘要 |
PROBLEM TO BE SOLVED: To provide a sync mark detection method that uses information from a preamble and the sign of sampled data in order to further increase the fault tolerance of a sync mark detector. SOLUTION: Digital data comprise a preamble field followed by a sync mark followed by a data field. Timing recovery (28) in a read channel synchronizes to a phase and frequency of the preamble field and a sync detector (A120) detects the sync mark in order to frame operation of an RLL decoder (36, A122) for decoding the detected data field. To decrease the probability of early misdetection, the sync mark is chosen to have minimum correlation with shifted versions of the sync mark concatenated with the preamble field. To further increase the fault tolerance, the sync mark detector is enabled by timing recovery relative to the end of the preamble field. COPYRIGHT: (C)2007,JPO&INPIT
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