{"height":"190","url":"https://bloch.hatenablog.com/entry/20111208","provider_name":"Hatena Blog","version":"1.0","title":"quadrature detection","blog_title":"bloch\u306e\u65e5\u8a18","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fbloch.hatenablog.com%2Fentry%2F20111208\" title=\"quadrature detection - bloch\u306e\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_url":"https://bloch.hatenablog.com/","description":"\u3060\u3044\u3076\u4ee5\u524d\u306b\u3001\u3053\u3053\u306b\u3042\u308b\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3092\u53c2\u8003\u306b\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f5c\u3063\u305f\u3002\u809d\u306f\u3001\u307e\u305a\u4fe1\u53f7\u306e\u5b9f\u90e8R\u3068\u865a\u90e8I\u3092\u305d\u308c\u305e\u308c\u8907\u7d20FFT\u3057\u3066FR,FI\u3068\u3057\u3001\u305d\u306e\u5b9f\u90e8\u3068\u865a\u90e8\u3092\u9069\u5b9c\u4e26\u3073\u66ff\u3048\u3066\u3001\u30b9\u30da\u30af\u30c8\u30eb\u306e\u5b9f\u90e8\u3068\u865a\u90e8\u3092\u3001 \u5b9f\u90e8\uff1aFR'\u2212FI\"(N/2-1,N/2-2..0),FR'\uff0bFI\"(0,1..N/2-1) \u865a\u90e8\uff1aFI'\uff0bFR\"(N/2-1,N/2-2..0),FR'\u2212FI\"(0,1..N/2-1) \u306e\u3088\u3046\u306b\u4f5c\u308a\u4e0a\u3052\u308c\u3070\u826f\u3044\u3002\u4f46\u3057j=0..N/2-1\u3067\u3042\u308b\u3002\u62d9\u4f5c\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306f\u4f55\u3068\u30d9\u30eb\u30c1\u30a8\u5148\u751f\u306b\u3082\u4f7f\u3063\u3066\u3044\u305f\u3060\u3044\u305f\u3002\u304a\u304b\u3052\u3067\u7531\u7dd2\u6b63\u3057\u3044\u30d7\u30ed\u30b0\u30e9\u30e0\u3068\u306a\u3063\u305f\u3001\u3048\u3063\u3078\u3093\u3002 \u6ce8\uff09\u30b9\u30da\u30af\u30c8\u30ed\u30e1\u30fc\u30bf\u306ecos\u3001sin\u51fa\u529b\u306e\u3069\u3061\u3089\u3092R\u3001\u2026","author_url":"https://blog.hatena.ne.jp/bloch/","author_name":"bloch","provider_url":"https://hatena.blog","width":"100%","categories":[],"type":"rich","image_url":null,"published":"2011-12-08 00:00:00"}