| 摘要 |
An optical magnetic disc reproducing device includes a detector for detecting the number of time of revolution of a spindle motor which revolves the disc, a frame synchronous signal detector for detecting the frame synchronous signal according to data detected from the disc and oscillation frequency of a voltage controlled oscillator, a spindle error detector for comparing the synchronous signal detected by the frame synchronous signal detector with a reference signal to detect a spindle error signal, a holding means for holding the number of time of revolution of the motor at the point of time when impulse generates according to the spindle error detector, and a microcomputer for comparing the number of time of revolution of the motor at the point of time after the impulse generates with the number of time of revolution of the holding means to control a servo.
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