公开(公告)号：JPH0689516A

公开(公告)日：1994-03-29

申请号：JP24529092

申请日：1992-09-14

Applicant: IBM

Inventor： ARAI KOICHI ,  HARU HIYARUMAA OTSUTESEN ,  ARAN SHIYARUMA ,  MACHIYUSANBII SURIIJIYAYANSA ,  MAIKERU CHIYAARUZU SUTEITSUKU

IPC: G11B21/08 ,  G11B5/596 ,  G11B19/02

Abstract: PURPOSE: To reduce seek time and to prevent overshooting by executing interpolation for deciding optimum time during the reception of a position error signal switching the current of a voice coil motor. CONSTITUTION: Reference track information R(K) and demodulation error signal information X(K) from a bus 46 are inputted to a subtraction node 150 and a difference signal E(K) is generated in a lead 151. The difference signal is supplied to an integrator 154 and a controller 156 and is supplied to an estimator 158 generating an estimation signal output. Estimation speed at the time of sampling (k), which is generated at the estimator, is supplied to the controller 156 through a lead 159. The extrapolation value of speed on a lead 160 is calculated in accordance with sampling k+1, and an extrapolation position V is also calculated to the lead 161 of a head. Then, it is supplied to the controller 156.