Technique for compensation for missing pulses when decoding gray

Details Technique for compensation for missing pulses when decoding gray Technique for compensation for missing pulses when decoding gray

1997-10-07

1999-11-09

Tokar, Michael

Coded data generation or conversion

Digital code to digital code converters

To or from constant distance codes

360 51, H03M 714, G11B 509

Patent

active

059823089

ABSTRACT:
A decoding compensation circuit, which compensates for missing pulses when decoding the gray code written in a magnetic disk of a hard disk drive (HDD) includes: a central processing unit (CPU) for controlling the hard disk drive, a positive pulse detection window generator for generating a positive pulse detection window signal, a digital servo data generator for generating a digital servo data, a gray code detection window generator for generating a gray code detection window signal, a first logic gate circuit for logically processing the positive pulse detection window signal, digital servo data and gray code detection window signal so as to produce positive and negative pulse gray codes, a gray sync/data separation circuit for separating gray data and gray sync from the positive and negative pulse gray codes, a second logic gate circuit for logically processing the positive and negative gray data and sync to compensate for missing gray data and sync, a gray sync decision circuit for detecting the gray sync produced from the second logic gate circuit based on the positive pulse detection window signal so as to make a decision to produce an error flag which is transferred to the central processing unit, and a gray data decision circuit for detecting the gray data produced from the second logic gate circuit based on a positive pulse detection window signal to produce binary gray data which is transferred to the central processing unit.

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