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:
Mar. 23, 2004
Filed:
Feb. 05, 2001
Yoshitsugu Inoue, Hyogo, JP;
Hiroyuki Kawai, Hyogo, JP;
Junko Kobara, Hyogo, JP;
Robert Streitenberger, Hyogo, JP;
Renesas Technology Corp., Tokyo, JP;
Abstract
A logarithmic arithmetic unit includes first logarithmic operation part multiplying an exponent part of floating-point data by a prescribed value, a logarithmic table memory outputting a logarithmic value corresponding to bit data expressing a digit higher than a prescribed digit of a fixed-point part of the floating-point data, divisional precision decision part deciding divisional precision on the basis of the exponent part, division part performing division on a dividend obtained by subtracting the bit data from the fixed-point part and a divisor of the bit data and obtaining a result of division of a number of digits set on the basis of the divisional precision, second logarithmic operation part obtaining the logarithmic value of a value obtained by dividing the fixed-point part by the bit data and sum operation part adding outputs from the first and second logarithmic operation parts and the logarithmic table memory to each other.