Channel qualifier for a hard disk drive which differentiates a r

Details Channel qualifier for a hard disk drive which differentiates a r Channel qualifier for a hard disk drive which differentiates a r

1994-02-17

1995-05-30

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

324212, G11B 509, G01R 3312

Patent

active

054207266

ABSTRACT:
A differentiating qualifier channel in a hard disk drive. The analog signal read off a magnetic disk by the transducer is amplified and filtered, then immediately differentiated. This differentiated waveform is used to both qualify and to detect the peaks of the analog read signal. Data pulses are qualified by noting that the differentiated waveform always changes polarity after the zero-crossing of a valid peak. Positive and negative peak signals are generated whenever the differentiated waveform exceeds established positive and negative thresholds. From this, a polarity signal is constructed. The pulses indicating where the polarity signal changes states are used to enable a latch. The latch is clocked by a zero-crossings signal which has been delayed such that the zero-crossings occur after the change in polarity. The output from this latch gives the valid qualified data pulses.

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patent: 5270875 (1993-12-01), Shah et al.
patent: 5287227 (1994-02-01), Cronch et al.

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