Dynamic filter for a moving head disk storage system

Details Dynamic filter for a moving head disk storage system Dynamic filter for a moving head disk storage system

1978-04-03

1979-10-23

Eddleman, Alfred H.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 77, 360 98, G11B 2108, G11B 2110, G11B 556

Patent

active

041722671

ABSTRACT:
A dynamic filter circuit used to process analog position error information in a disk drive head-positioning servo system is disclosed. The filter circuit monitors the velocity of the disk drive carriage and dynamically increases the gain and bandwidth of the filter as the carriage velocity increases. Specifically, an operational amplifier in feedback configuration is used in which the feedback networks are switched in response to the velocity signal. At low carriage velocity the filter has low gain and reduced bandwidth and therefore helps to decrease sensitivity of the system to noise. At high carriage velocities the gain and bandwidth of the filter are increased to minimize the effects of missing servo data.

REFERENCES:
patent: 3427606 (1969-02-01), Black et al.
patent: 3864741 (1975-02-01), Schwarz
patent: 3947881 (1976-03-01), Dahill et al.
patent: 3994016 (1976-11-01), Moghadam
patent: 4075667 (1978-02-01), Rose et al.
patent: 4085427 (1978-04-01), Dunn

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