| 摘要 |
Apparatus suppresses seek-induced vibration in a disc drive. The apparatus is responsive to a selected bang-bang command to provide an operating signal to the actuator, such as a voice coil motor, representing the selected bang-bang command with damped amplitudes of dominant vibration mode frequencies of the selected bang-bang command. One example of the apparatus is a finite impulse response filter having a discrete transfer function of C(1+al1z-l+al2z-l.2+ . . . +alrz-l.r), where C is a constant, al1, al2, . . . alr represent impulse amplitudes at spaced positions within a sample period and z-l.1, z-l.2, . . . z-l.r represent delay components at the respective spaced positions. In a preferred embodiment, the finite impulse response filter employs a pole-zero cancellation technique to damp amplitudes of selected frequencies. The discrete transfer function is derived based on a conjugate pair of poles in an s-domain for each of a plurality of vibration frequencies ofwhere zetai is the damping ratio and omegani is the natural frequency for the i-th mode.
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