| 摘要 |
In a closed-loop control system and a servo device of an optical disk unit, a loop gain can be suitably corrected by a simplified structure. A signal is added to a closed loop and a value having a correlation with a gain of the closed loop is measured in accordance with the added signal. The loop gain is changed such that the measured value is equal to a predetermined value. Therefore, it is possible to suitably correct the loop gain.
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