US 12,456,486 B1
Digital-filter engine with pre-compute of output
Richard M. Ehrlich, Edina, MN (US)
Assigned to Kabushiki Kaisha Toshiba, Kawasaki (JP); and Toshiba Electronic Devices & Storage Corporation, Kawasaki (JP)
Filed by Kabushiki Kaisha Toshiba, Tokyo (JP); and Toshiba Electronic Devices & Storage Corporation, Tokyo (JP)
Filed on Sep. 23, 2024, as Appl. No. 18/893,326.
Int. Cl. G11B 5/596 (2006.01); G11B 5/55 (2006.01)
CPC G11B 5/59622 (2013.01) [G11B 5/5573 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of controlling an actuator for a magnetic head of a disk drive via a digital filter, the method comprising:
determining a first output of the digital filter for a first servo wedge, based on a set of state variable values associated with the digital filter and an estimated control input to the digital filter;
after determining the first output, receiving an actual control input for the digital filter that is based on position information associated with the magnetic head crossing the first servo wedge;
determining a second output of the digital filter for the first servo wedge based on the first output, the estimated control input, and the actual control input; and
applying the second output of the digital filter to the actuator.