| 摘要 |
PROBLEM TO BE SOLVED: To suppress deterioration of operation accuracy, while suppressing the scale of a processing device. SOLUTION: A plurality of FFT parts 5, 8 for performing fast Fourier transform, and a plurality of IFFT parts 9, 12 for performing inverse fast Fourier transform are connected in series, and operation results of fast Fourier transform or inverse fast Fourier transform are outputted in a block floating point format which is expressed by a plurality of fixed point data and one exponent which is common to the data. Exponent adjustment parts 7, 11 are provided, for adjusting exponent, if data having different exponent are included in the fixed point data, when executing fast Fourier transform or inverse fast Fourier transform to the fixed point data. COPYRIGHT: (C)2011,JPO&INPIT
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