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. 06, 2004
Filed:
Jul. 23, 1999
George D. Zuras, Jr., San Jose, CA (US);
Hewlett-Packard Development Company, L.P., Houston, TX (US);
Abstract
A cyclic SEC-DED-PEC code is provided and circuitry therefor which has the characteristics of two different distance codes. When w[i] and w[j] are two different code words in the code, then distance(w[i],w[j])≧4 for all i≠j and, when w[i] and w[j] differ in both of an adjacent pair of bits, then distance(w[i],w[j])≧6 where distance(w ,w ) is the ordinary Hamming distance. When the code is permuted by a cyclic permutation, the same code results. The code may be thought of in hyperspace as a hypersphere of a certain distance having spikes extending from the center of the hypersphere to the tip of the spike a further distance. This presents a “hyper-mace”, thus the name “Mace Code”, having the property that it is a certain distance code generally and a further distance code in the direction of the spikes. The circuitry further provides for a code that is only slightly more complex than an ordinary distance-4 code but which can correct more errors that are likely to occur.