Pulse or digital communications – Synchronizers – Frequency or phase control using synchronizing signal
Reexamination Certificate
2005-02-15
2005-02-15
Chin, Stephen (Department: 2634)
Pulse or digital communications
Synchronizers
Frequency or phase control using synchronizing signal
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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Kondo Masaharu
Watanabe Yoshiju
Antonelli Terry Stout & Kraus LLP
Chin Stephen
Hitachi , Ltd.
Odom Curtis
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