Method and apparatus for suppressing seek-induced vibration in a disc drive
US6560059B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 5, 2000 |
| Grant date | May 6, 2003 |
| Priority date | — |
| Expiry date | Apr 5, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/556
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
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 of where &zgr;i is the damping ratio and &ohgr;ni is the natural frequency for the i-th mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.