The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 17, 2002
Filed:
Sep. 15, 2000
Zhiqiang Liu, Oklahoma City, OK (US);
Seagate Technology LLC, Scotts Valley, CA (US);
Abstract
Apparatus and method for attenuating effects of externally generated vibration applied along multiple axes of a disc drive. The disc drive includes a disc with a recording surface, a read/write head and a servo circuit which detects and corrects head position error. The servo circuit determines a plant estimate indicative of transfer function response of the disc drive while the disc drive is operated off-line. A sensor network concurrently generates a plurality of acceleration signals each along a different axis of the disc drive and indicative of a different component of the externally generated vibration applied along the corresponding axis. An adaptive filter network adaptively filters the acceleration signals to generate a compensation signal. The compensation signal is fed forward to the servo circuit to remove the effects of the externally generated vibration.