Data storage device computing notch filters for multiple temperatures
AssigneeWestern Digital Technologies, Inc.
InventorsHengchang Guo, Tetsuo Ueda, Chuanwen Ji, Alexander Babinski, Shinsuke Nakagawa
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Abstract
A data storage device is disclosed comprising a head actuated over the disk. A first notch filter is calibrated at a first temperature, and a second notch filter is computed for a second temperature based on the first notch filter and a first delta temperature between the first temperature and the second temperature. The second notch filter is computed by transforming a continuous-time transfer function of the first notch filter adjusted by the first delta temperature into a discrete-time transfer function of the second notch filter.
Claims17
A data storage device comprising:
- a disk;
- a head actuated over the disk;
- and
- control circuitry configured to:
- calibrate a first notch filter at a first temperature;
- and
- compute a second notch filter for a second temperature based on the first notch filter and a first delta temperature between the first temperature and the second temperature,
- wherein the second notch filter is computed by transforming a continuous-time transfer function of the first notch filter adjusted by the first delta temperature into a discrete-time transfer function of the second notch filter.
A data storage device comprising:
- a disk;
- a head actuated over the disk;
- and
- control circuitry configured to:
- calibrate a first notch filter at a first temperature;
- compute a second notch filter based on a center frequency shift of the first notch filter due to a first temperature delta between the first temperature and a second temperature,
- wherein the second notch filter is computed by transforming a continuous-time transfer function of the first notch filter adjusted by the first delta temperature into a discrete-time transfer function of the second notch filter.
A data storage device comprising:
- a disk;
- a head actuated over the disk;
- and
- a means for calibrating a first notch filter at a first temperature;
- and
- a means for computing a second notch filter for a second temperature based on the first notch filter and a delta temperature between the first temperature and the second temperature.
Dependencies are inferred from the claim text.