Patents by Inventor Atsufum SHIBAYAMA

Atsufum SHIBAYAMA has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Fast fourier transform circuit, fast fourier transform processing method, and program recording medium
    Patent number: 9727531
    Abstract: Provided is a fast Fourier transform circuit including: a first butterfly circuit and a second butterfly circuit which perform butterfly calculations corresponding to calculation bit-widths being different from each other; and a control means which controls selection of the first and second butterfly circuits in accordance with any one of a plurality of operation modes including: a first operation mode in which a calculation is performed by both of the first and second butterfly circuits; and a second operation mode in which a calculation is performed by any one of the first and second butterfly circuits.
    Type: Grant
    Filed: November 19, 2013
    Date of Patent: August 8, 2017
    Assignee: NEC CORPORATION
    Inventor: Atsufum Shibayama
  • FAST FOURIER TRANSFORM CIRCUIT, FAST FOURIER TRANSFORM PROCESSING METHOD, AND PROGRAM RECORDING MEDIUM
    Publication number: 20150301986
    Abstract: Provided is a fast Fourier transform circuit including: a first butterfly circuit and a second butterfly circuit which perform butterfly calculations corresponding to calculation bit-widths being different from each other; and a control means which controls selection of the first and second butterfly circuits in accordance with any one of a plurality of operation modes including: a first operation mode in which a calculation is performed by both of the first and second butterfly circuits; and a second operation mode in which a calculation is performed by any one of the first and second butterfly circuits.
    Type: Application
    Filed: November 19, 2013
    Publication date: October 22, 2015
    Applicant: NEC Corporation
    Inventor: Atsufum SHIBAYAMA