| 摘要 |
PROBLEM TO BE SOLVED: To let the tape driving device self-adjust a PLL circuit in operation without impairing reproducing performance. SOLUTION: In searching, a parameter value of PLL circuit 63 is varied, and an optimum value (adjusted value) is obtained based on the evaluation value obtained with each parameter value. In this case, if the parameter value is varied within a range of the number of successive tracks in which a start ID is recorded and the number of revolutions of a drum which is decided based on the tape running speed at the time of searching operation and is to enable the start ID to be caught, the target start ID can surely be caught even if the parameter is varied, therefore, the searching is also properly operated.
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