#fft #dft #fourier #フーリエ #フーリエ解析 #エクセル This is a 16GB USB memory stick. It includes a DFT (Discrete Fourier Transform) calculation sheet created using the spreadsheet software Excel. DFT Specifications: By inputting arbitrary waveform data into column A, you can easily obtain the sin and cos components up to the 20th order. Unlike FFT, the number of data points that can be input does not need to be a power of 2. The maximum number of input waveform data points is 1000. Please note that the cells other than the input cells are protected.