できましたほんとうにありがとう
http://yukara-13.hatenablog.com/entry/2013/12/05/025655
http://hyperconcerto.hatenablog.com/entry/2016/01/28/211437
https://algorithm.joho.info/programming/python/numpy-fast-fourier-transform/
https://algorithm.joho.info/programming/python/numpy-fft-power-spectrum/