Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2006-04-18
2006-04-18
Hudspeth, David (Department: 2651)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
Reexamination Certificate
active
07031096
ABSTRACT:
Disclosed is a data storage device, a servo control method, and a program to reduce effects of a resonance frequency of an actuator or the like without reduction in servo control performance. A band-pass filter comprising a first all pass filter (APF) and a second adder, a second APF, and a multiplier are used to detect how much a current resonance frequency of the actuator deviates from a set value of a center frequency of the first APF, and based on a result of the detection, the center frequency of the first APF is properly adjusted. The adjustment of the center frequency of first APF enables a center frequency of a notch filter comprising the first APF and a first adder to be automatically approximated to a current resonance frequency of the actuator.
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Gill William D.
Hudspeth David
Saber Paik
Tzeng Fred F.
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