| 摘要 |
A recording or reproducing device for a disc shape recording medium of the type having wobbled grooves includes a circuit for reproducing the recording medium, a circuit for extracting groove information, comparing the frequency of the groove information with a predetermined value, and determining from the comparison if the spindle servo is in a runaway state, and a control circuit which disables a PLL circuit in a spindle servo control if a runaway state is detected to thereby stop the runaway state.
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