Shock control for rotational recording apparatus

Details Shock control for rotational recording apparatus Shock control for rotational recording apparatus

2005-10-25

2005-10-25

Hudspeth, David (Department: 2651)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

Reexamination Certificate

active

06958882

ABSTRACT:
A rotational recording apparatus that comprises a shock sensor and that adaptively processes the output of the shock sensor to obtain a feed forward signal, so as to implement a stable operation within a practical range. In a rotational recording apparatus wherein a VCM system having a transfer function (G) and a controller having a transfer function (H) perform feedback, the band of a signal(s) of a shock sensor (S) is limited by a bandpass filter (F), and a resultant signal (f) is employed to obtain the output of an adaptive filter (FIR). A signal (p) that a phase shift filter (P) outputs by shifting the phase of the signal f is employed as a signal to be transmitted to a parameter adaptation algorithm (PAA). Within the limited band, the phase of the phase shift filter P matches the phase of G/(1+GH) within a range of ±90 degrees.

REFERENCES:
patent: 06-333325 (1994-02-01), None
patent: 07-130114 (1995-05-01), None

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