{"height":"190","provider_url":"https://hatena.blog","image_url":"https://cdn-ak.f.st-hatena.com/images/fotolife/T/TadaoYamaoka/20160901/20160901214612.png","categories":["FFT","\u30d4\u30c3\u30c1\u89e3\u6790"],"type":"rich","provider_name":"Hatena Blog","version":"1.0","width":"100%","author_name":"TadaoYamaoka","title":"FFT\u3068\u30a8\u30cd\u30eb\u30ae\u30fc\u306b\u3064\u3044\u3066\u306e\u8003\u5bdf(\u7d9a\u304d2)","published":"2016-09-01 22:04:40","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Ftadaoyamaoka.hatenablog.com%2Fentry%2F2016%2F09%2F01%2F220440\" title=\"FFT\u3068\u30a8\u30cd\u30eb\u30ae\u30fc\u306b\u3064\u3044\u3066\u306e\u8003\u5bdf(\u7d9a\u304d2) - TadaoYamaoka\u306e\u958b\u767a\u65e5\u8a18\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","blog_title":"TadaoYamaoka\u306e\u958b\u767a\u65e5\u8a18","author_url":"https://blog.hatena.ne.jp/TadaoYamaoka/","blog_url":"https://tadaoyamaoka.hatenablog.com/","description":"\u524d\u56de\u306e\u7d9a\u304d\u3067\u3059\u3002\u30d4\u30fc\u30af\u306e\u5468\u6ce2\u6570\u306e\u5468\u8fba\u306e\u30d1\u30ef\u30fc\u30b9\u30da\u30af\u30c8\u30eb\u306e\u548c\u304c\u30a8\u30cd\u30eb\u30ae\u30fc(\u5168\u5468\u6ce2\u6570\u306e\u30d1\u30ef\u30fc\u30b9\u30da\u30af\u30c8\u30eb\u306e\u7dcf\u548c)\u306b\u5360\u3081\u308b\u5272\u5408\u3092\u3001400Hz\u304b\u3089500Hz\u306e\u7bc4\u56f2\u30670.1Hz\u304a\u304d\u306b\u8abf\u3079\u3066\u307f\u305f\u3002 fset = np.linspace(400, 500, 1001) range = [1, 3, 5] for r in range: peaks = [] for f in fset: y = np.sin(2 * np.pi * f * t) Y = np.fft.fft(y) P = abs(Y[0:size/2])**2 P_around = np.convolve(P, np.ones(r), 'va\u2026","url":"https://tadaoyamaoka.hatenablog.com/entry/2016/09/01/220440"}