| 摘要 |
<p>PROBLEM TO BE SOLVED: To conduct fast-Fourier transformation processing on a data string, including sampling data that are sequentially supplied within a single sampling period. SOLUTION: With regard to this Fourier transformation device, when N pieces of the latest data are acquired among pieces of data that are sequentially supplied and temporarily stored, while eliminating old data, a data-updating part 1 supplies the value of difference between the latest supplied data value and a data value to be eliminated; the supplied data value and the latest FFT operation results temporarily stored in a memory part 3 are supplied to a recursive DFT operating part 3; these values are calculated with a prescribed method; and FFT operation results to the N pieces of the latest data values are outputted in real time.</p> |
