Rotation control apparatus employing a comb filter and phase error detector

摘要

A rotation control apparatus employing a comb filter to cut off a specified frequency and multiples thereof in response to speed error data detected from a rotation detector. A phase error detector detects a phase error between the rotation detector and an external vertical synchronization pulse. A differentiator converts the output of the filter into angular acceleration error data. The output of the phase error detector is integrated. The two values are scaled and converted to an analog signal which is utilized to drive a motor.