Data storage device with notch filter calibration based on multi-rate excitation and error rejection
US11817122B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 25, 2022 |
| Grant date | Nov 14, 2023 |
| Priority date | — |
| Expiry date | Aug 25, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B25/04
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Various illustrative aspects are directed to a data storage device, comprising one or more disks; an actuator mechanism configured to position one or more heads proximate to one or more disk surfaces of the one or more disks; and one or more processing devices, comprising an actuator mechanism control system configured for controlling the actuator mechanism. The processing devices are configured to: apply coefficients for a multi-rate notch filter to a servo control loop; measure a multi-rate error rejection transfer function; determine whether a peak of the multi-rate error rejection transfer function is greater than a multi-rate error rejection transfer function threshold; and modify, responsively to determining that the peak of the multi-rate error rejection transfer function is not greater than the multi-rate error rejection transfer function threshold, the parameters of the multi-rate notch filter based at least in part on the peak of the multi-rate error rejection transfer function.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.