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US 12,456,489 B2Granted
Magnetic disk device
AssigneesKabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
InventorTakuji Matsuzawa
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Abstract
According to one embodiment, a magnetic disk device includes a loop shaping filter by a digital filter, which is disposed in parallel to a controller, having a peak at certain frequency, and coefficients of which are determined by a sensitivity function and a controlled object, wherein the coefficients of the loop shaping filter of the digital filter based on a change in a sampling period of servo information.
Claims7
A magnetic disk device, comprising:
- a loop shaping filter disposed in parallel to a controller, having a peak in a predetermined frequency, and through digital filter coefficients of which are determined by a sensitivity function and a controlled object, wherein filter coefficients of the digital filter are determined based on a change in a sampling period of servo information;
- and
- a filter coefficient update controller configured to, based on at least a first sampling period, first angular frequency peak of which is a gain characteristic of a first digital filter, where first filter coefficients of the digital filter derived with respect to the first sampling period is applied to the first digital filter, second angular frequency which is different from the first angular frequency, and a first matching parameter used to derive the first filter coefficients,
- derive second filter coefficients of the digital filter with respect to a second sampling period which is different from the first sampling period.
1 more element
Dependencies are inferred from the claim text.