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:
Jun. 10, 2003
Filed:
Jun. 12, 2002
Naoki Satoh, Odawara, JP;
Seiichi Mita, Kanagawa-ken, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A magnetic disk drive having an active filter supplied with a read waveform of a magnetic disk, an A/D converter supplied with an output of the active filter, a waveform equalizer supplied with an output of the A/D converter. An adaptive learning unit for adaptively learning a boost characteristic of the active filter on the basis of an input and an output of the waveform equalizer so that error in the waveform equalizer is minimized. An abnormal learning detection unit for detecting an abnormal operation in adaptive learning of the boost characteristic just after learning of a sector and a boost characteristic resetter for resetting the boost characteristic before adaptive learning to an initial value before adaptive learning of a next sector when abnormality occurs in adaptive learning of the adaptive learning unit.