Dynamic magnetic information storage or retrieval – General processing of a digital signal – Head amplifier circuit
Patent
1993-03-31
1994-11-01
Hajec, Donald
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Head amplifier circuit
360 65, G11B 509, G11B 5035
Patent
active
053611756
ABSTRACT:
A system and method for calibrating amplifier gain and a comparator threshold for use in verification of magnetic media integrity in a magnetic data storage device. Commercially available read data processors are used which have an amplifier with controllable gain and a comparator with an internal indirectly-controllable threshold. An on-board voltage reference is provided for gain calibration. The calibrated gain is used to provide signals with known peak values for calibrating the comparator threshold. In one embodiment, the numeric control value for the threshold is reduced from a calibrated peak value to a specified fraction for media verification. In a second embodiment, the gain is reduced to the industry specified fraction and the threshold is calibrated to match peak signal magnitudes at the reduced gain. The gain is then returned to the calibrated level for media verification.
REFERENCES:
patent: 4516162 (1985-05-01), West
patent: 4635142 (1987-01-01), Haugland
patent: 4688113 (1987-08-01), Parsons
patent: 5150050 (1992-09-01), Genheimer et al.
Richardson Kenneth G.
Young Mark A.
Hajec Donald
Hwelett-Packard Company
Kim Won Tae C.
Winfield Augustus W.
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