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. 21, 1978
Filed:
Apr. 20, 1976
Applicant:
Inventor:
Kunihiko Niwa, Tokyo, JA;
Assignee:
Nippon Electric Co., Ltd., Tokyo, JA;
Primary Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
364726 ; 324 / ;
Abstract
An arithmetic unit for performing the operation of multiplying input data by successive powers of a constant and accumulating the products represented by ##EQU1## WHERE .alpha. IS A CONSTANT, IS DISCLOSED. The arithmetic unit includes a recursive path which does not necessitate a multiplier, and operations which really necessitate multiplication are carried out only when the input data have substantially entered this recursive path thereby substantially reducing the number of multiplications required. The arithmetic unit has particular application in performing DFT (Discrete Fourier Transform) or IDFT (Inverse Discrete Fourtier Transform).