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:
Oct. 23, 2001
Filed:
Feb. 24, 1999
Li Du, Denver, CO (US);
Mark Stephen Spurbeck, Superior, CO (US);
Richard Travis Behrens, Lafayette, CO (US);
Cirrus Logic, Inc., Austin, TX (US);
Abstract
The invention includes disk drive circuitry, systems, and methods. The disk drive system comprises control circuitry and a disk device. The disk device stores data and transfers an analog signal representing the data. The control circuitry receives the analog signal, converts the analog signal into a digital signal, transfers the digital signal, and biases an error signal. The control circuitry includes an analog-to-digital converter, adaptive filter, a decoder, and error signal circuitry. The analog-to-digital converter receives and samples the analog signal to generate a sampled signal. The adaptive filter shapes the sampled signal based on coefficients to produce a shaped signal. The decoder decodes the shaped signal to generate the digital signal. The error signal circuitry generates the biased error signal to adjust the coefficients in the adaptive filter. The error signal circuitry may generate the error signal by determining a difference between the shaped signal from the adaptive filter and an ideal signal. The error signal circuitry may bias the error signal by biasing the ideal signal. The error signal circuitry may bias the ideal signal by adjusting a slicer output by a step value.