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. 27, 2015
Filed:
Jan. 30, 2009
Kameran Azadet, Morganville, NJ (US);
Jian-guo Chen, Basking Ridge, NJ (US);
Samer Hijazi, Bethlehem, PA (US);
Joseph Williams, Holmdel, NJ (US);
Kameran Azadet, Morganville, NJ (US);
Jian-Guo Chen, Basking Ridge, NJ (US);
Samer Hijazi, Bethlehem, PA (US);
Joseph Williams, Holmdel, NJ (US);
Intel Corporation, Santa Clara, CA (US);
Abstract
A digital signal processor is provided having an instruction set with a logarithm function that uses a reduced look-up table. The disclosed digital signal processor evaluates a logarithm function for an input value, x, by decomposing the input value, x, to a first part, N, a second part, q, and a remaining part, r, wherein the first part, N, is identified by a position of a most significant bit of the input value, x, and the second part, q, is comprised of a number of bits following the most significant bit, wherein the number is small relative to a number of bits in the input value, x; obtaining a value from a first look-up table based on the second part, q; computing an epsilon term, ε, using the expression evaluating an expression Log(1+ε) using a polynomial approximation, such as a cubic approximation; and determining the logarithm function for the input value, x, by summing the values of N, and Log(1+ε).