Hard disk drive read channel with half speed timing

Details Hard disk drive read channel with half speed timing Hard disk drive read channel with half speed timing

1996-10-18

1999-08-31

Le, Amanda T.

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

375354, 341144, 341155, 360 23, 360 40, 369 59, 395555, 395559, H04K 110

Patent

active

059463546

ABSTRACT:
A hard disk drive read circuit for d=1 run length limited (RLL) encoded data which processes multiple consecutive data samples in parallel. The circuit of the present invention receives an analog signal from the read head of the hard disk drive. The circuit comprises a plurality of digital detection channels, coupled to the analog signal, each channel outputting an alternate bit of digital data represented by the analog signal. A timing circuit, coupled to the plurality of digital detection channels, generates a plurality of timing signals controlling the plurality of digital detection channels. The timing circuit derives timing information from one of the digital detection channels. The d=1 RLL code is modified so that there are at most nine consecutive 0's in the digital data output by the digital detection channel from which the timing circuit derives the timing information. An encoder generates the encoded digital data to be recorded on the hard disk drive.

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