Signal processing method and apparatus and disk device using...

Pulse or digital communications – Synchronizers – Frequency or phase control using synchronizing signal

Reexamination Certificate

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Details

C375S363000, C375S365000, C375S366000, C375S368000

Reexamination Certificate

active

06856660

ABSTRACT:
A signal processing circuit having a data sync signal detector and a disk device. Input data read from a magnetic disk is input to a data discriminator. A data discrimination output constituting a code bit output discriminated by the data discriminator is input to a post-coder the output of which is input to a decoder and a (1+D) processing unit. The processed output of the processing unit is input to an error detection/correction unit and separated into bit strings of odd numbered bits and even numbered bits, divided into groups. An error detection/correction output is input to a data sync signal detector, and matched against a sync pattern. When the number of coincident groups is greater than a threshold value, a sync signal is output and upon detection causes the decoder to demodulate the data.

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