Offset and gain error discriminator

Dynamic magnetic information storage or retrieval – General processing of a digital signal – Head amplifier circuit

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360 7702, G11B 509, G11B 5596

Patent

active

054557208

ABSTRACT:
Positive and negative peaks of the differential pulses produced by a differential head of a disk drive are detected. The respective peaks, which represent the positive and negative peaks of the pulses, are compared to a set of reference levels and, depending upon the relationship of those peaks with the reference levels, a gain error or an offset error is indicated. If the positive pulse peaks and negative pulse peaks exhibit substantially similar relationships with respect to the reference levels, a gain error is indicated. However, if the positive pulse peaks and negative pulse peaks exhibit dissimilar relationships with respect to the reference levels, an offset error is indicated.

REFERENCES:
patent: 3959820 (1976-05-01), Braun
patent: 4085427 (1978-04-01), Dunn
patent: 4380034 (1983-04-01), Krake
patent: 4477849 (1984-10-01), Berger
patent: 4647992 (1987-03-01), Vinal
patent: 5153787 (1992-10-01), Sidman
Patent Abstracts of Japan, vol. 4, No. 118 (P-24), Aug. 1980 & JP-A-55 073970 (Fujitsu).

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