Patent ID: 11915731
Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 15:
16. The method of claim 14, wherein outputting the multi-rate excitation comprises outputting a plurality of excitations having a plurality of different frequencies to the at least one multi-rate notch filter of the actuator mechanism control system,
wherein outputting the plurality of excitations having the plurality of different frequencies comprises:
summing substantially sinusoidal excitations having a plurality of frequencies into a simultaneous multi-rate excitation; and
outputting the simultaneous multi-rate excitation,

wherein detecting the frequency response of the actuator mechanism comprises:
detecting a frequency response of the actuator mechanism to the simultaneous multi-rate excitation, wherein detecting the frequency response of the actuator mechanism in response to the multi-rate excitation comprises:
determining a multi-rate error rejection transfer function based at least in part on the multi-rate excitation, wherein determining the multi-rate error rejection transfer function comprises performing Fourier transforms of the multi-rate sinusoidal excitation and at least one of a single-rate servo control loop response, a multi-rate servo control loop response, and a multi-rate notch filter input.