Patent ID: 6049441
Filing Date: 2000-04-11
Classification: G11B

Abstract:
An apparatus for real-time filtering of at least one of a position error signal, a velocity error signal and an acceleration error signal in a device having a rotating body and a sensor that senses at least one of the position, velocity and acceleration of the rotating body, comprising:a first input receiving at least one of a position error signal for a present servo sector index, velocity error signal for a present servo sector index, and an acceleration error signal for a present servo sector index;a second input receiving at least one of a future repeatable position error for a future servo sector index, a future repeatable velocity error for a future servo sector index, and a future repeatable acceleration error for a future servo sector index, the future servo sector index corresponding with a servo sector on the rotating body sensed by said sensor subsequent to a servo sector corresponding with the present servo sector index, and being different than that of the servo sector corresponding with the present servo sector index; andan output providing at least one of a filtered position error signal for the present servo sector index, a filtered velocity error signal for the present servo sector index, and a filtered acceleration error signal for the present servo sector index based respectively on the position error signal for the present servo sector index and the future repeatable position error for the future servo sector index, the velocity error signal for the present servo sector index and the future velocity position error for the future servo sector index, and the acceleration error signal for the present servo sector index and the future repeatable acceleration error for the future servo sector index.