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:
Nov. 12, 2002
Filed:
Jan. 05, 2000
Yoshitsugu Inoue, Tokyo, JP;
Hiroyuki Kawai, Tokyo, JP;
Junko Kobara, Tokyo, JP;
Robert Streitenberger, Tokyo, JP;
Keijiro Yoshimatsu, Tokyo, JP;
Hiroyasu Negishi, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A power operation device comprises a bit operation unit or performing a bit shift operation on a logarithmic base bit string from a logarithm operation unit according to an input exponent bit string Y, and for furnishing the shifted logarithmic base bit string as a multiplication bit string. An exponent checking unit checks whether or not the input exponent bit string Y is the i power of a base 2 where i is an integer, and, if so, furnishes a selection signal to direct selection of the multiplication bit string from the bit operation unit. A multiplication bit string selection unit selects and furnishes the multiplication bit string when it receives the selection signal from the exponent checking unit. In contrast, the multiplication bit string selection unit selects and furnishes another multiplication bit string from a multiplier otherwise. An exponential operation unit performs a base-2 exponential operation on the selected multiplication bit string from the multiplication bit string selection unit, i.e., computes 2 where Z is the selected multiplication bit string, and furnishes the computed base-2 exponential value as the power operation-result X .