| 摘要 |
<p>PURPOSE:To rapidly control a motor by constructing to compare in phase the frequency divided output of a data signal with a reference signal and supplying the reference signal to a frequency divider which divides the data signal when a motor is stopped. CONSTITUTION:The output of a reference oscillator 11 is divided in frequency by a frequency divider 10 and applied to a phase comparator 13. On the other hand, a data signal which is detected by a pickup 1 is applied to a phase comparator 13 through an amplifier 3 and a frequency divider 8. The output of the comparator 13 is supplied to a motor drive circuit 15 through a low pass filter 14, thereby controlling the rotating speed of a motor 16. When the motor 16 is stopped, a changeover switch 9 is switched, and the output of a reference oscillator 11 is supplied together with the input of the comparator 13 through the frequency dividers 8, 10.</p> |
