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. 24, 2006
Filed:
Jul. 10, 1996
Christopher P. Zook, Longmont, CO (US);
Christopher P. Zook, Longmont, CO (US);
Cirrus Logic, Inc., Austin, TX (US);
Abstract
A rate ½, d=1 channel code encodes a Gray code servo track address into channel data recorded on a magnetic disk; a d=1 Viterbi sequence detector detects the recorded servo track address upon read back; a cost effective d=1 decoder decodes the recorded servo track address into its Gray code representation; and a 1/1+D filter decodes the Gray code track address into its binary representation. The channel encoding scheme increases the data density of the storage system due to the d=1 constraint and use of the Viterbi sequence detector. Further, the implementation advantageously uses the Viterbi sequence detector already provided in a read channel for detecting user data, and the cost and complexity of the decoder is reduced by encoding/decoding the Gray code track address in sections of five bits.