Using read channel noise to initialize read channel for head pos

Details Using read channel noise to initialize read channel for head pos Using read channel noise to initialize read channel for head pos

1993-03-31

1996-05-21

Hajec, Donald T.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of equalizing

G11B 5035

Patent

active

055195482

ABSTRACT:
A method of calibrating signal processing circuitry in a magnetic data storage device. The method ensures that an adequate signal-to-noise ratio is achieved when reading a head-position calibration signal. First, discrimination thresholds are set to an initial low value. Then, with wide bandwidth and stationary media, amplifier gain is calibrated by adjusting gain to make the amplitude of amplified background noise equal to the initial threshold value. Finally, bandwidth is reduced and the discrimination thresholds are raised to a final value. The final threshold value ensures that a signal must exceed a predetermined signal-to-noise ratio before the signal is accepted as being valid.

REFERENCES:
patent: 3593334 (1971-07-01), Bickel
patent: 4081756 (1978-03-01), Price et al.
patent: 4516162 (1985-05-01), West
patent: 4635142 (1987-01-01), Haugland

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