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:
Jun. 30, 2009
Filed:
Feb. 25, 2004
Yusaku Yamamoto, Nagoya, JP;
Ken Naono, Tachikawa, JP;
Yusaku Yamamoto, Nagoya, JP;
Ken Naono, Tachikawa, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In a 3-dimensional fast Fourier transformation implemented by using a parallel-processing computer, an overhead caused by transfers of data between processors employed in the computer is reduced for the purpose of increasing the efficiency of processing parallelism. In order to reduce the overhead, data is divided into data elements each having an even X coordinate and data elements each having an odd X coordinate. In processing 34, the date elements each having an even coordinate are subjected to the transformation in the Y direction while the date elements each having an odd X coordinate are being subjected to a process of permutation among the processors at the same time. In processing 35, on the other hand, the data elements each having an odd X coordinate are subjected to the transformation in the X direction while the data elements each having even coordinate are being subjected to the process of permutation among the processors at the same time. As a result, the communication time it takes to carry out the process of permutation among the processors can be concealed behind the processing time so that the efficiency of the processing parallelism can be increased over the processing efficiency of the conventional method.