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:
Apr. 16, 2013
Filed:
Sep. 30, 2009
Jingfeng Liu, Longmont, CO (US);
Haotian Zhang, Longmont, CO (US);
Hongwei Song, Longmont, CO (US);
Lingyan Sun, Longmont, CO (US);
Jingfeng Liu, Longmont, CO (US);
Haotian Zhang, Longmont, CO (US);
Hongwei Song, Longmont, CO (US);
Lingyan Sun, Longmont, CO (US);
LSI Corporation, San Jose, CA (US);
Abstract
In one embodiment, a (hard-drive) read channel has a (DFIR equalization) filter, whose tap coefficients are adaptively updated. A reset controller monitors an (LLR) signal generated downstream of the filter to automatically determine when to reset the filter, e.g., by reloading an initial set of user-specified tap coefficients. For LLR values, the reset controller determines to reset the filter when the reset controller detects that too many recent LLR values have confidence values that are too low. When implemented in a hard-drive read channel, the reset controller can reset the filter one or more times during read operations within a sector of the hard drive.