| 摘要 |
PROBLEM TO BE SOLVED: To realize stable operation within a practical range in a rotary recorder provided with a shock sensor and for obtaining a feedforward signal by adaptively processing an output of the shock sensor. SOLUTION: In this rotary recorder in which a VCM system whose transfer function is represented with G and a controller whose transfer function is represented with H configures feedback, a signals of the shock sensor S is subjected to band limitation with a bandpass filter F, and an output (feedforward control signal ff) of an adaptive filter FIR is obtained by using a signal (f) that has been subjected to band limitation. For a signal to be inputted to a parameter adaptive algorithm PAA, a signal (p) obtained by shifting the phase of the signal (f) with a phase shift filter P is used. The phase of the phase shift filter P coincides with the phase of G/(1+GH) within the range of±90 deg. within a limited band.
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