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. 02, 2002
Filed:
Mar. 11, 1999
System and method for performing a fast fourier transform using a matrix-vector multiply instruction
Applicant:
Inventors:
Avadhani Shridhar, Santa Clara, CA (US);
Arindam Saha, Sunnyvale, CA (US);
Assignee:
Hitachi America Ltd., New York, NY (US);
Primary Examiner:
Int. Cl.
CPC ...
G06F 1/714 ;
U.S. Cl.
CPC ...
G06F 1/714 ;
Abstract
A system and method that implement a butterfly operation for a fast fourier transform operation in a processor using a matrix-vector-multiply instruction. A first set of inputs to the butterfly operation are defined as r1+j i1 and r2+j i2, and a twiddle factor Wn is defined as Wn=e =cos(2&pgr;/N)−j sin(2&pgr;/N)=a+jb. The butterfly operation stores r1, i1, r2 and i2 in a first set of registers and stores the twiddle factor in matrix registers. The matrix-vector-multiply instruction is executed between the matrix registers and the first set of registers.