| 摘要 |
A disc drive apparatus ( 1 ) comprises; a) actuator means ( 50 ) for controlling the positioning of an element ( 34 ) of a scanning means; b) error signal calculating means ( 111, 112 ) for receiving a read signal (SR) and generating at least one error (RES; e(k)); c) a state estimator ( 120 ) for receiving said error and for outputting derived signals (s 1, s 2, s 3 ); d) shock detector means ( 130 ) for generating a shock indication signal (SIS) on the basis of one (s 1 ) of said derived signals; e) actuator control signal generator means ( 190 ) having at least one variable control parameter, for generating an actuator control signal (RAD; u(k)) on the basis of a second one (s 2 ) of said derived signals; f) the actuator control signal generator means setting a first value for said variable control parameter during normal operation, and setting a second value for said variable control parameter when said shock indication signal indicates the occurrence of a shock.
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