| 摘要 |
PURPOSE:To preferably control the rotation of a disk even when a signal is missed by providing a signal-miss detector. CONSTITUTION:When a signal-miss is detected by a signal-miss detector 10, a switch 12 is closed, an oscillation signal of an oscillator 11 is added to an adder 13 to add it to a reproduced signal (a) having a signal-miss. Then, the added output becomes (b). Then, an FM modulation output becomes (c), and the output of a synchronization detector 4 becomes (d), thereby the erasure of the data sink is suppresses as much as possible. When the data sink is suppressed as much as possible, the rotation of the motor can be rapidly pulled-in to the prescribed speed even at the fast forward or temporary stop mode time. |
