{"blog_title":"\u30bf\u30b3\u3055\u3093\u30d6\u30ed\u30b0","published":"2016-06-27 09:38:09","image_url":null,"author_url":"https://blog.hatena.ne.jp/tiny_wing/","description":"C\u8a00\u8a9e\u3067\u306f\u3058\u3081\u308b\u97f3\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u2015\u30b5\u30a6\u30f3\u30c9\u30a8\u30d5\u30a7\u30af\u30c8\u306e\u4fe1\u53f7\u51e6\u7406 \u30da\u30fc\u30b833 \u3067\u53d6\u308a\u4e0a\u3052\u3089\u308c\u3066\u3044\u308b\u30b5\u30a4\u30f3\u6ce2\u3092 vDSP(vectorized digital signal processing) \u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u4f7f\u7528\u3057\u3066\u3001FFT\u306b\u3088\u308a\u632f\u5e45\u30b9\u30da\u30af\u30c8\u30eb\u3092\u6c42\u3081\u308b(\u3053\u3053\u3067\u306f\u7c21\u5358\u306e\u305f\u3081\u306b\u7a93\u95a2\u6570\u3092\u7528\u3044\u305a\u306bFFT\u3092\u5b9f\u884c\u3059\u308b)\u3002 \u30b5\u30a4\u30f3\u6ce2\u306f\u6b21\u5f0f\u306e\u3088\u3046\u306b\u8868\u305b\u3089\u308c\u308b\u3002 x(n) = Amp * sin(2 * PI * f0 * n / fs), (0<=n<N) \u3053\u3053\u3067\u3001Amp\u306f\u632f\u5e45\u3001f0\u306f\u57fa\u672c\u5468\u6ce2\u6570\u3001fs\u306f\u6a19\u672c\u5316\u5468\u6ce2\u6570\u3001n\u306f\u6a19\u672c\u5316\u6570\u3002 FFT\u3092\u5b9f\u884c\u3059\u308b\u97f3\u30c7\u30fc\u30bf\u3068\u3057\u3066\u3001\u4ee5\u4e0b\u306e\u5024\u3092\u3068\u308b\u30b5\u30a4\u30f3\u6ce2\u3092\u8003\u3048\u308b\u3002 \u632f\u5e45(Amp\u2026","width":"100%","title":"Swift vDSP \u3067 \u5b9fFFT","blog_url":"https://tiny-wing.hatenablog.com/","height":"190","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Ftiny-wing.hatenablog.com%2Fentry%2F2016%2F06%2F27%2F093809\" title=\"Swift vDSP \u3067 \u5b9fFFT - \u30bf\u30b3\u3055\u3093\u30d6\u30ed\u30b0\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","provider_url":"https://hatena.blog","provider_name":"Hatena Blog","categories":["iOS","swift"],"url":"https://tiny-wing.hatenablog.com/entry/2016/06/27/093809","version":"1.0","author_name":"tiny_wing","type":"rich"}