{"id":523,"date":"2014-08-31T19:36:44","date_gmt":"2014-08-31T10:36:44","guid":{"rendered":"https:\/\/www.utsbox.com\/?page_id=523"},"modified":"2023-04-28T12:43:36","modified_gmt":"2023-04-28T03:43:36","slug":"%e3%83%87%e3%82%b8%e3%82%bf%e3%83%ab%e3%83%95%e3%82%a3%e3%83%ab%e3%82%bf","status":"publish","type":"page","link":"https:\/\/www.utsbox.com\/?page_id=523","title":{"rendered":"\u7c21\u5358\u306a\u30c7\u30b8\u30bf\u30eb\u30d5\u30a3\u30eb\u30bf\u306e\u5b9f\u88c5"},"content":{"rendered":"<h1>\u7c21\u5358\u306a\u30c7\u30b8\u30bf\u30eb\u30d5\u30a3\u30eb\u30bf\u306e\u5b9f\u88c5<\/h1>\n<p>\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u30c7\u30b8\u30bf\u30eb\u697d\u5668\u3084\u30a8\u30d5\u30a7\u30af\u30bf\u30fc\u306a\u3069\u306e\u4f5c\u6210\u3092\u4f5c\u6210\u3057\u3066\u3044\u308b\u3068\u3001\u5fc5\u305a\u5fc5\u8981\u306b\u306a\u3063\u3066\u304f\u308b\u306e\u304c\u30c7\u30b8\u30bf\u30eb\u30d5\u30a3\u30eb\u30bf(\u30ed\u30fc\u30d1\u30b9\u30d5\u30a3\u30eb\u30bf\u3084\u30cf\u30a4\u30d1\u30b9\u30d5\u30a3\u30eb\u30bf\u7b49)\u3067\u3059\u3002<\/p>\n<p>\u3057\u304b\u3057\u3001\u300c1,000Hz\u4ee5\u4e0b\u3092\u901a\u3059\u30ed\u30fc\u30d1\u30b9\u30d5\u30a3\u30eb\u30bf\u304c\u307b\u3057\u3044\u300d\u7b49\u3068\u601d\u3063\u3066\u3001\u3044\u3056\u30c7\u30b8\u30bf\u30eb\u30d5\u30a3\u30eb\u30bf\u3092\u5b9f\u88c5\u3057\u3088\u3046\u3068\u3059\u308b\u3068\u3001\u30d5\u30a3\u30eb\u30bf\u8a2d\u8a08(\u30d5\u30a3\u30eb\u30bf\u4fc2\u6570\u306e\u7b97\u51fa)\u306e\u90e8\u5206\u3067\u300cZ\u5909\u63db\u300d\u3084\u300c\u4f1d\u9054\u95a2\u6570\u300d\u3068\u3044\u3063\u305f\u9ad8\u5ea6\u306a\u6570\u5b66\u3067\u306e\u8aac\u660e\u304c\u59cb\u307e\u308a\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u6642\u70b9\u3067\u30cf\u30fc\u30c9\u30eb\u304c\u9ad8\u304f\u3001\u30c7\u30b8\u30bf\u30eb\u697d\u5668\u3084\u30a8\u30d5\u30a7\u30af\u30bf\u30fc\u306e\u4f5c\u6210\u3092\u3042\u304d\u3089\u3081\u3066\u3057\u307e\u3046\u4eba\u304c\u591a\u3044\u306e\u3067\u306f\u306a\u3044\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n<p>\u3053\u3053\u3067\u306f\u3088\u304f\u5229\u7528\u3059\u308b\u30c7\u30b8\u30bf\u30eb\u30d5\u30a3\u30eb\u30bf\u306b\u3064\u3044\u3066\u3001\u6975\u529b\u9ad8\u5ea6\u306a\u6570\u5b66\u3092\u4f7f\u308f\u305a\u7c21\u5358\u306b\u30d5\u30a3\u30eb\u30bf\u8a2d\u8a08(\u30d5\u30a3\u30eb\u30bf\u4fc2\u6570\u7b97\u51fa)\u30fb\u5b9f\u88c5\u3067\u304d\u308b\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3057\u305f\u306e\u3067\u7d39\u4ecb\u3055\u305b\u3066\u3044\u305f\u3060\u304d\u307e\u3059\u3002<\/p>\n<p>\u4eca\u56de\u306e\u5185\u5bb9\u3092C++\u306e\u30af\u30e9\u30b9\u3068\u3057\u3066\u7c21\u5358\u306b\u307e\u3068\u3081\u305f\u3082\u306e\u306f<a href=\"https:\/\/www.utsbox.com\/?page_id=728\">\u3053\u3061\u3089<\/a>\u306b\u3042\u308a\u307e\u3059\u3002\u3000\u2192\u3000<a href=\"https:\/\/www.utsbox.com\/?page_id=728\">\u7c21\u5358\u306a\u30c7\u30b8\u30bf\u30eb\u30d5\u30a3\u30eb\u30bf\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9<\/a><\/p>\n<hr \/>\n<h1 id=\"Robert Bristow-Johnson Audio EQ Cookbook\">Robert Bristow-Johnson Audio EQ Cookbook<\/h1>\n<p>\u7c21\u5358\u306b\u30d5\u30a3\u30eb\u30bf\u8a2d\u8a08\u30fb\u5b9f\u88c5\u3059\u308b\u65b9\u6cd5\u306fRobert Bristow-Johnson\u3068\u3044\u3046\u65b9\u304c\u300cRBJ Audio EQ Cookbook\u300d\u3068\u3044\u3046\u30c6\u30ad\u30b9\u30c8\u306b\u307e\u3068\u3081\u3066\u304a\u308a\u307e\u3059\u3002<\/p>\n<p>\u300cRBJ Audio EQ Cookbook\u300d\u3067\u306f\u3001<a href=\"https:\/\/www.utsbox.com\/?page_id=523#\u53cc2\u6b21(BiQuad)\u30d5\u30a3\u30eb\u30bf\">\u53cc2\u6b21(BiQuad)\u30d5\u30a3\u30eb\u30bf<\/a>(\u5f8c\u8ff0)\u3068\u3088\u3070\u308c\u308b\u30bf\u30a4\u30d7\u306e\u30d5\u30a3\u30eb\u30bf\u306b\u5bfe\u3057\u3066\u3001\u4e0b\u8a18\u306e\u30d5\u30a3\u30eb\u30bf\u4fc2\u6570\u306e\u6c42\u3081\u65b9\u3092\u307e\u3068\u3081\u3066\u304a\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u30ed\u30fc\u30d1\u30b9\u30d5\u30a3\u30eb\u30bf<\/li>\n<li>\u30cf\u30a4\u30d1\u30b9\u30d5\u30a3\u30eb\u30bf<\/li>\n<li>\u30d0\u30f3\u30c9\u30d1\u30b9\u30d5\u30a3\u30eb\u30bf<\/li>\n<li>\u30ce\u30c3\u30c1\u30d5\u30a3\u30eb\u30bf<\/li>\n<li>\u30ed\u30fc\u30b7\u30a7\u30eb\u30d5\u30d5\u30a3\u30eb\u30bf<\/li>\n<li>\u30cf\u30a4\u30b7\u30a7\u30eb\u30d5\u30d5\u30a3\u30eb\u30bf<\/li>\n<li>\u30d4\u30fc\u30ad\u30f3\u30b0\u30d5\u30a3\u30eb\u30bf<\/li>\n<li>\u30aa\u30fc\u30eb\u30d1\u30b9\u30d5\u30a3\u30eb\u30bf<\/li>\n<\/ul>\n<p>\u305d\u308c\u305e\u308c\u306e\u30d5\u30a3\u30eb\u30bf\u306b\u5bfe\u3057\u3066\u3001\u4e0b\u8a18\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u30fc\u3092\u6c7a\u3081\u3066\u3001\u300cRBJ Audio EQ Cookbook\u300d\u306b\u8a18\u8f09\u3055\u308c\u305f\u8a08\u7b97\u65b9\u6cd5\u3067\u8a08\u7b97\u3092\u3059\u308c\u3070\u3001\u7c21\u5358\u306b\u30d5\u30a3\u30eb\u30bf\u4fc2\u6570\u304c\u6c42\u3081\u3089\u308c\u307e\u3059\u3002(\u30d5\u30a3\u30eb\u30bf\u4fc2\u6570\u306e\u8a08\u7b97\u65b9\u6cd5\u306b\u3064\u3044\u3066\u306f<a href=\"https:\/\/www.utsbox.com\/?page_id=523#RBJ Audio EQ Cookbook\u306b\u3088\u308b\u30d5\u30a3\u30eb\u30bf\u4fc2\u6570\u306e\u6c42\u3081\u65b9\">\u5f8c\u8ff0<\/a>\u3057\u307e\u3059\u3002)<\/p>\n<ul>\n<li>\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u5468\u6ce2\u6570(\u5358\u4f4d\uff1aHz)<\/li>\n<li>\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570(\u5358\u4f4d\uff1aHz)<\/li>\n<li>\u30d5\u30a3\u30eb\u30bf\u306eQ\u5024<\/li>\n<li>\u5e2f\u57df\u5e45(\u5358\u4f4d\uff1aoctave)<\/li>\n<li>\u5897\u5e45\u91cf(\u5358\u4f4d\uff1adB)<\/li>\n<\/ul>\n<p>\u3000\u203b\u30d5\u30a3\u30eb\u30bf\u306e\u7a2e\u985e\u306b\u3088\u3063\u3066\u306f\u4f7f\u308f\u306a\u3044\u30d1\u30e9\u30e1\u30fc\u30bf\u30fc\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<hr \/>\n<h1 id=\"\u53cc2\u6b21(BiQuad)\u30d5\u30a3\u30eb\u30bf\">\u53cc2\u6b21(BiQuad)\u30d5\u30a3\u30eb\u30bf<\/h1>\n<p>\u53cc2\u6b21(BiQuad)\u30d5\u30a3\u30eb\u30bf\u306f\u5165\u529b\u4fe1\u53f7\u306b\u5bfe\u3057\u30662\u3064\u524d\u307e\u3067\u306e\u5165\u529b\u4fe1\u53f7\u30682\u3064\u524d\u307e\u3067\u306e\u51fa\u529b\u4fe1\u53f7\u3092\u4f7f\u7528\u3057\u3066\u51fa\u529b\u4fe1\u53f7\u3092\u8a08\u7b97\u3059\u308b\u30c7\u30b8\u30bf\u30eb\u30d5\u30a3\u30eb\u30bf\u306b\u306a\u308a\u307e\u3059\u3002<br \/>\n\u53cc2\u6b21(BiQuad)\u30d5\u30a3\u30eb\u30bf\u306e\u8a73\u7d30\u306b\u3064\u3044\u3066\u306f\u7701\u7565\u3044\u305f\u3057\u307e\u3059\u3002C\/C++\u3067\u5b9f\u88c5\u3059\u308b\u5834\u5408\u3001\u4e0b\u8a18\u306e\u3088\u3046\u306a\u30a4\u30e1\u30fc\u30b8\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u3010\u5b9f\u88c5\u30a4\u30e1\u30fc\u30b8\u3011<br \/>\n[crayon]<br \/>\n\/\/ \u305d\u308c\u305e\u308c\u306e\u5909\u6570\u306f\u4e0b\u8a18\u306e\u3068\u304a\u308a\u3068\u3059\u308b<br \/>\n\/\/ \u3000float input[]  \u2026\u5165\u529b\u4fe1\u53f7\u306e\u683c\u7d0d\u3055\u308c\u305f\u30d0\u30c3\u30d5\u30a1\u3002<br \/>\n\/\/ \u3000flaot output[] \u2026\u30d5\u30a3\u30eb\u30bf\u51e6\u7406\u3057\u305f\u5024\u3092\u66f8\u304d\u51fa\u3059\u51fa\u529b\u4fe1\u53f7\u306e\u30d0\u30c3\u30d5\u30a1\u3002<br \/>\n\/\/ \u3000int   size     \u2026\u5165\u529b\u4fe1\u53f7\u30fb\u51fa\u529b\u4fe1\u53f7\u306e\u30d0\u30c3\u30d5\u30a1\u306e\u30b5\u30a4\u30ba\u3002<br \/>\n\/\/ \u3000float in1, in2, out1, out2  \u2026\u30d5\u30a3\u30eb\u30bf\u8a08\u7b97\u7528\u306e\u30d0\u30c3\u30d5\u30a1\u5909\u6570\u3002\u521d\u671f\u5024\u306f0\u3002<br \/>\n\/\/ \u3000float a0, a1, a2, b0, b1, b2 \u2026\u30d5\u30a3\u30eb\u30bf\u306e\u4fc2\u6570\u3002 \u5225\u9014\u7b97\u51fa\u3059\u308b\u3002<br \/>\nfor(int i = 0; i < size; i++)\n{\n\t\/\/ \u5165\u529b\u4fe1\u53f7\u306b\u30d5\u30a3\u30eb\u30bf\u3092\u9069\u7528\u3057\u3001\u51fa\u529b\u4fe1\u53f7\u3068\u3057\u3066\u66f8\u304d\u51fa\u3059\u3002\n\toutput[i] = b0\/a0 * input[i] + b1\/a0 * in1  + b2\/a0 * in2\n\t                             - a1\/a0 * out1 - a2\/a0 * out2;\n\n\tin2  = in1;       \/\/ 2\u3064\u524d\u306e\u5165\u529b\u4fe1\u53f7\u3092\u66f4\u65b0\n\tin1  = input[i];  \/\/ 1\u3064\u524d\u306e\u5165\u529b\u4fe1\u53f7\u3092\u66f4\u65b0\n\n\tout2 = out1;      \/\/ 2\u3064\u524d\u306e\u51fa\u529b\u4fe1\u53f7\u3092\u66f4\u65b0\n\tout1 = output[i]; \/\/ 1\u3064\u524d\u306e\u51fa\u529b\u4fe1\u53f7\u3092\u66f4\u65b0\n}\n[\/crayon]\n\n\n\n<hr \/>\n<h1 id=\"RBJ Audio EQ Cookbook\u306b\u3088\u308b\u30d5\u30a3\u30eb\u30bf\u4fc2\u6570\u306e\u6c42\u3081\u65b9\">RBJ Audio EQ Cookbook\u306b\u3088\u308b\u30d5\u30a3\u30eb\u30bf\u4fc2\u6570\u306e\u6c42\u3081\u65b9<\/h1>\n<p>\u30d5\u30a3\u30eb\u30bf\u4fc2\u6570(a0\uff5ea2\u3001b0\uff5eb2)\u306e\u6c42\u3081\u65b9\u306f<a href=\"https:\/\/www.utsbox.com\/?page_id=523#Robert Bristow-Johnson Audio EQ Cookbook\">\u524d\u8ff0\u306e\u5404\u30d1\u30e9\u30e1\u30fc\u30bf<\/a>\u3092\u5143\u306bRBJ Audio EQ Cookbook\u306b\u8a18\u8f09\u3055\u308c\u305f\u5f0f\u306b\u5f53\u3066\u306f\u3081\u308c\u3070\u6c42\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br \/>\n\u5404\u30d5\u30a3\u30eb\u30bf\u3054\u3068\u306b\u4f7f\u7528\u3059\u308b\u30d1\u30e9\u30e1\u30fc\u30bf\u3084\u8a08\u7b97\u65b9\u6cd5\u304c\u9055\u3046\u306e\u3067\u305d\u308c\u305e\u308c\u306e\u30d5\u30a3\u30eb\u30bf\u3067\u306e\u30d5\u30a3\u30eb\u30bf\u4fc2\u6570\u306e\u6c42\u3081\u65b9\u306b\u3064\u3044\u3066\u8a18\u8f09\u3044\u305f\u3057\u307e\u3059\u3002<\/p>\n<h2 id=\"\u30ed\u30fc\u30d1\u30b9\u30d5\u30a3\u30eb\u30bf\">\u30ed\u30fc\u30d1\u30b9\u30d5\u30a3\u30eb\u30bf<\/h2>\n<p>\u30ed\u30fc\u30d1\u30b9\u30d5\u30a3\u30eb\u30bf\u306f\u3001\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570\u4ee5\u4e0b\u306e\u97f3\u58f0\u306e\u307f\u3092\u901a\u3059\u30d5\u30a3\u30eb\u30bf\u3067\u3059\u3002\u4e0b\u8a18\u306e3\u3064\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u5468\u6ce2\u6570(\u5358\u4f4d\uff1aHz)<\/li>\n<li>\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570(\u5358\u4f4d\uff1aHz)<\/li>\n<li>\u30d5\u30a3\u30eb\u30bf\u306eQ\u5024<\/li>\n<\/ul>\n<p>\u30d5\u30a3\u30eb\u30bf\u4fc2\u6570\u306e\u6c42\u3081\u65b9\u306f\u4e0b\u8a18\u306e\u901a\u308a\u3067\u3059\u3002(C\/C++\u30b3\u30fc\u30c9\u30a4\u30e1\u30fc\u30b8)<br \/>\n[crayon]<br \/>\n\/\/ \u305d\u308c\u305e\u308c\u306e\u5909\u6570\u306f\u4e0b\u8a18\u306e\u3068\u304a\u308a\u3068\u3059\u308b<br \/>\n\/\/ float samplerate \u2026 \u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u5468\u6ce2\u6570<br \/>\n\/\/ float freq \u2026 \u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570<br \/>\n\/\/ float q    \u2026 \u30d5\u30a3\u30eb\u30bf\u306eQ\u5024<br \/>\nfloat omega = 2.0f * 3.14159265f *  freq\u3000\/\u3000samplerate;<br \/>\nfloat alpha = sin(omega) \/ (2.0f * q);<\/p>\n<p>float a0 =  1.0f + alpha;<br \/>\nfloat a1 = -2.0f * cos(omega);<br \/>\nfloat a2 =  1.0f &#8211; alpha;<br \/>\nfloat b0 = (1.0f &#8211; cos(omega)) \/ 2.0f;<br \/>\nfloat b1 =  1.0f &#8211; cos(omega);<br \/>\nfloat b2 = (1.0f &#8211; cos(omega)) \/ 2.0f;<br \/>\n[\/crayon]<\/p>\n<p>\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570\u306f\u305d\u308c\u4ee5\u4e0a\u306e\u5468\u6ce2\u6570\u3092\u901a\u3055\u306a\u304f\u3059\u308b\u5468\u6ce2\u6570\u3067\u3059\u3002(\u53b3\u5bc6\u306b\u306f\u51fa\u529b\u4fe1\u53f7\u304c-3dB\u3068\u306a\u308b\u5468\u6ce2\u6570\u3002\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570\u3088\u308a\u4f4e\u3044\u5468\u6ce2\u6570\u304b\u3089\u6e1b\u8870\u304c\u59cb\u307e\u308a\u307e\u3059\u3002)<br \/>\nQ\u5024\u3092\u5927\u304d\u304f\u3059\u308b\u3053\u3068\u3067\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570\u3067\u306eGain\u306e\u6e1b\u5c11\u3092\u6291\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u304c\u3001\u5927\u304d\u304f\u3057\u3059\u304e\u308b\u3068\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570\u4ed8\u8fd1\u304c\u304c\u5f37\u8abf\u3055\u308c\u3066\u3057\u307e\u3044\u307e\u3059\u3002(\u30b7\u30f3\u30bb\u30b5\u30a4\u30b6\u30fc\u306e\u30ec\u30be\u30ca\u30f3\u30b9\u306e\u3088\u3046\u306a\u52b9\u679c\u304c\u304b\u304b\u308a\u307e\u3059\u3002)<br \/>\n\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570\u4ed8\u8fd1\u3092\u5f37\u8abf\u3057\u305f\u304f\u306a\u3044\u5834\u5408\u306f\u3001Q\u5024\u30921\/\u221a2\u306b\u3057\u307e\u3059\u3002\u306a\u304a\u3001Q\u5024\u306f0\u3088\u308a\u5927\u304d\u3044\u5024\u3067\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002<\/p>\n<p><a href=\"https:\/\/www.utsbox.com\/wp-content\/uploads\/2015\/09\/20150921_LowPass.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.utsbox.com\/wp-content\/uploads\/2015\/09\/20150921_LowPass.png\" alt=\"20150921_LowPass\" width=\"762\" height=\"442\" class=\"alignnone size-full wp-image-875\" srcset=\"https:\/\/www.utsbox.com\/wp-content\/uploads\/2015\/09\/20150921_LowPass.png 762w, https:\/\/www.utsbox.com\/wp-content\/uploads\/2015\/09\/20150921_LowPass-300x174.png 300w\" sizes=\"auto, (max-width: 762px) 100vw, 762px\" \/><\/a><\/p>\n<h2 id=\"\u30cf\u30a4\u30d1\u30b9\u30d5\u30a3\u30eb\u30bf\">\u30cf\u30a4\u30d1\u30b9\u30d5\u30a3\u30eb\u30bf<\/h2>\n<p>\u30cf\u30a4\u30d1\u30b9\u30d5\u30a3\u30eb\u30bf\u306f\u3001\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570\u4ee5\u4e0a\u306e\u97f3\u58f0\u306e\u307f\u3092\u901a\u3059\u30d5\u30a3\u30eb\u30bf\u3067\u3059\u3002\u4e0b\u8a18\u306e3\u3064\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u5468\u6ce2\u6570(\u5358\u4f4d\uff1aHz)<\/li>\n<li>\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570(\u5358\u4f4d\uff1aHz)<\/li>\n<li>\u30d5\u30a3\u30eb\u30bf\u306eQ\u5024<\/li>\n<\/ul>\n<p>\u30d5\u30a3\u30eb\u30bf\u4fc2\u6570\u306e\u6c42\u3081\u65b9\u306f\u4e0b\u8a18\u306e\u901a\u308a\u3067\u3059\u3002(C\/C++\u30b3\u30fc\u30c9\u30a4\u30e1\u30fc\u30b8)<\/p>\n<p>[crayon]<br \/>\n\/\/ \u305d\u308c\u305e\u308c\u306e\u5909\u6570\u306f\u4e0b\u8a18\u306e\u3068\u304a\u308a\u3068\u3059\u308b<br \/>\n\/\/ float samplerate \u2026 \u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u5468\u6ce2\u6570<br \/>\n\/\/ float freq \u2026 \u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570<br \/>\n\/\/ float q    \u2026 \u30d5\u30a3\u30eb\u30bf\u306eQ\u5024<br \/>\nfloat omega = 2.0f * 3.14159265f *  freq\u3000\/\u3000samplerate;<br \/>\nfloat alpha = sin(omega) \/ (2.0f * q);<\/p>\n<p>float a0 =   1.0f + alpha;<br \/>\nfloat a1 =  -2.0f * cos(omega);<br \/>\nfloat a2 =   1.0f &#8211; alpha;<br \/>\nfloat b0 =  (1.0f + cos(omega)) \/ 2.0f;<br \/>\nfloat b1 = -(1.0f + cos(omega));<br \/>\nfloat b2 =  (1.0f + cos(omega)) \/ 2.0f;<br \/>\n[\/crayon]<\/p>\n<p>\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570\u306f\u305d\u308c\u4ee5\u4e0b\u306e\u5468\u6ce2\u6570\u3092\u901a\u3055\u306a\u304f\u3059\u308b\u5468\u6ce2\u6570\u3067\u3059\u3002(\u53b3\u5bc6\u306b\u306f\u51fa\u529b\u4fe1\u53f7\u304c-3dB\u3068\u306a\u308b\u5468\u6ce2\u6570\u3002\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570\u3088\u308a\u9ad8\u3044\u5468\u6ce2\u6570\u304b\u3089\u6e1b\u8870\u304c\u59cb\u307e\u308a\u307e\u3059\u3002)<br \/>\nQ\u5024\u3092\u5927\u304d\u304f\u3059\u308b\u3053\u3068\u3067\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570\u3067\u306eGain\u306e\u6e1b\u5c11\u3092\u6291\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u304c\u3001\u5927\u304d\u304f\u3057\u3059\u304e\u308b\u3068\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570\u4ed8\u8fd1\u304c\u304c\u5f37\u8abf\u3055\u308c\u3066\u3057\u307e\u3044\u307e\u3059\u3002(\u30b7\u30f3\u30bb\u30b5\u30a4\u30b6\u30fc\u306e\u30ec\u30be\u30ca\u30f3\u30b9\u306e\u3088\u3046\u306a\u52b9\u679c\u304c\u304b\u304b\u308a\u307e\u3059\u3002)<br \/>\n\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570\u4ed8\u8fd1\u3092\u5f37\u8abf\u3057\u305f\u304f\u306a\u3044\u5834\u5408\u306f\u3001Q\u5024\u30921\/\u221a2\u306b\u3057\u307e\u3059\u3002\u306a\u304a\u3001Q\u5024\u306f0\u3088\u308a\u5927\u304d\u3044\u5024\u3067\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002<\/p>\n<p><a href=\"https:\/\/www.utsbox.com\/wp-content\/uploads\/2015\/09\/20150921_HighPass1.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.utsbox.com\/wp-content\/uploads\/2015\/09\/20150921_HighPass1.png\" alt=\"20150921_HighPass1\" width=\"762\" height=\"442\" class=\"alignnone size-full wp-image-872\" srcset=\"https:\/\/www.utsbox.com\/wp-content\/uploads\/2015\/09\/20150921_HighPass1.png 762w, https:\/\/www.utsbox.com\/wp-content\/uploads\/2015\/09\/20150921_HighPass1-300x174.png 300w\" sizes=\"auto, (max-width: 762px) 100vw, 762px\" \/><\/a><\/p>\n<h2 id=\"\u30d0\u30f3\u30c9\u30d1\u30b9\u30d5\u30a3\u30eb\u30bf\">\u30d0\u30f3\u30c9\u30d1\u30b9\u30d5\u30a3\u30eb\u30bf<\/h2>\n<p>\u30d0\u30f3\u30c9\u30d1\u30b9\u30d5\u30a3\u30eb\u30bf\u306f\u3001\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570\u3092\u4e2d\u5fc3\u3068\u3057\u5e2f\u57df\u5e45\u5206\u306e\u97f3\u58f0\u306e\u307f\u3092\u901a\u3059\u30d5\u30a3\u30eb\u30bf\u3067\u3059\u3002\u4e0b\u8a18\u306e3\u3064\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u5468\u6ce2\u6570(\u5358\u4f4d\uff1aHz)<\/li>\n<li>\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570(\u5358\u4f4d\uff1aHz)<\/li>\n<li>\u5e2f\u57df\u5e45(\u5358\u4f4d\uff1aoctave)<\/li>\n<\/ul>\n<p>\u30d5\u30a3\u30eb\u30bf\u4fc2\u6570\u306e\u6c42\u3081\u65b9\u306f\u4e0b\u8a18\u306e\u901a\u308a\u3067\u3059\u3002(C\/C++\u30b3\u30fc\u30c9\u30a4\u30e1\u30fc\u30b8)<\/p>\n<p>[crayon]<br \/>\n\/\/ \u305d\u308c\u305e\u308c\u306e\u5909\u6570\u306f\u4e0b\u8a18\u306e\u3068\u304a\u308a\u3068\u3059\u308b<br \/>\n\/\/ float samplerate \u2026 \u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u5468\u6ce2\u6570<br \/>\n\/\/ float freq \u2026 \u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570<br \/>\n\/\/ float bw   \u2026 \u5e2f\u57df\u5e45<br \/>\nfloat omega = 2.0f * 3.14159265f *  freq\u3000\/\u3000samplerate;<br \/>\nfloat alpha = sin(omega) * sinh(log(2.0f) \/ 2.0 * bw * omega \/ sin(omega));<\/p>\n<p>float a0 =  1.0f + alpha;<br \/>\nfloat a1 = -2.0f * cos(omega);<br \/>\nfloat a2 =  1.0f &#8211; alpha;<br \/>\nfloat b0 =  alpha;<br \/>\nfloat b1 =  0.0f;<br \/>\nfloat b2 = -alpha;<br \/>\n[\/crayon]<\/p>\n<p>\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570\u306f\u901a\u3059\u5e2f\u57df\u306e\u4e2d\u5fc3\u3068\u306a\u308b\u5468\u6ce2\u6570\u3067\u3059\u3002\u5e2f\u57df\u5e45\u306f\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570\u304b\u3089\u3069\u3053\u307e\u3067\u306e\u5468\u6ce2\u6570\u3092\u901a\u3059\u304b\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002(\u53b3\u5bc6\u306b\u306f\u51fa\u529b\u4fe1\u53f7\u304c-3dB\u3068\u306a\u308b\u5468\u6ce2\u6570\u3002)<br \/>\n\u4f8b\u3048\u3070\u3001\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570\u304c440Hz\u3067\u5e2f\u57df\u5e45\u304c1\u30aa\u30af\u30bf\u30fc\u30d6\u306a\u3089\u3001220Hz\uff5e880Hz\u3067\u30012\u30aa\u30af\u30bf\u30fc\u30d6\u306a\u3089110Hz\uff5e1760Hz\u304c\u901a\u3059\u5468\u6ce2\u6570\u3068\u306a\u308a\u307e\u3059\u3002<br \/>\n\u306a\u304a\u3001\u5e2f\u57df\u5e45\u306f0\u3088\u308a\u5927\u304d\u3044\u5024\u3067\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002<\/p>\n<p><a href=\"https:\/\/www.utsbox.com\/wp-content\/uploads\/2015\/09\/20150921_BandPass1.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.utsbox.com\/wp-content\/uploads\/2015\/09\/20150921_BandPass1.png\" alt=\"20150921_BandPass1\" width=\"762\" height=\"442\" class=\"alignnone size-full wp-image-871\" srcset=\"https:\/\/www.utsbox.com\/wp-content\/uploads\/2015\/09\/20150921_BandPass1.png 762w, https:\/\/www.utsbox.com\/wp-content\/uploads\/2015\/09\/20150921_BandPass1-300x174.png 300w\" sizes=\"auto, (max-width: 762px) 100vw, 762px\" \/><\/a><\/p>\n<h2 id=\"\u30ce\u30c3\u30c1\u30d5\u30a3\u30eb\u30bf\">\u30ce\u30c3\u30c1\u30d5\u30a3\u30eb\u30bf<\/h2>\n<p>\u30ce\u30c3\u30c1\u30d5\u30a3\u30eb\u30bf\u306f\u3001\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570\u3092\u4e2d\u5fc3\u3068\u3057\u305f\u5e2f\u57df\u5e45\u5206\u306e\u97f3\u58f0\u4ee5\u5916\u3092\u901a\u3059\u30d5\u30a3\u30eb\u30bf\u3067\u3059\u3002\u4e0b\u8a18\u306e3\u3064\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u5468\u6ce2\u6570(\u5358\u4f4d\uff1aHz)<\/li>\n<li>\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570(\u5358\u4f4d\uff1aHz)<\/li>\n<li>\u5e2f\u57df\u5e45(\u5358\u4f4d\uff1aoctave)<\/li>\n<\/ul>\n<p>\u30d5\u30a3\u30eb\u30bf\u4fc2\u6570\u306e\u6c42\u3081\u65b9\u306f\u4e0b\u8a18\u306e\u901a\u308a\u3067\u3059\u3002(C\/C++\u30b3\u30fc\u30c9\u30a4\u30e1\u30fc\u30b8)<\/p>\n<p>[crayon]<br \/>\n\/\/ \u305d\u308c\u305e\u308c\u306e\u5909\u6570\u306f\u4e0b\u8a18\u306e\u3068\u304a\u308a\u3068\u3059\u308b<br \/>\n\/\/ float samplerate \u2026 \u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u5468\u6ce2\u6570<br \/>\n\/\/ float freq \u2026 \u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570<br \/>\n\/\/ float bw   \u2026 \u5e2f\u57df\u5e45<br \/>\nfloat omega = 2.0f * 3.14159265f *  freq\u3000\/\u3000samplerate;<br \/>\nfloat alpha = sin(omega) * sinh(log(2.0f) \/ 2.0 * bw * omega \/ sin(omega));<\/p>\n<p>float a0 =  1.0f + alpha;<br \/>\nfloat a1 = -2.0f * cos(omega);<br \/>\nfloat a2 =  1.0f &#8211; alpha;<br \/>\nfloat b0 =  1.0f;<br \/>\nfloat b1 = -2.0f * cos(omega);<br \/>\nfloat b2 =  1.0f;<br \/>\n[\/crayon]<\/p>\n<p>\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570\u306f\u901a\u3055\u306a\u3044\u5e2f\u57df\u306e\u4e2d\u5fc3\u3068\u306a\u308b\u5468\u6ce2\u6570\u3067\u3059\u3002\u5e2f\u57df\u5e45\u306f\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570\u304b\u3089\u3069\u3053\u307e\u3067\u306e\u5468\u6ce2\u6570\u3092\u901a\u3055\u306a\u3044\u304b\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002(\u53b3\u5bc6\u306b\u306f\u51fa\u529b\u4fe1\u53f7\u304c-3dB\u3068\u306a\u308b\u5468\u6ce2\u6570\u3002)<br \/>\n\u4f8b\u3048\u3070\u3001\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570\u304c440Hz\u3067\u5e2f\u57df\u5e45\u304c1\u30aa\u30af\u30bf\u30fc\u30d6\u306a\u3089\u3001220Hz\uff5e880Hz\u3067\u30012\u30aa\u30af\u30bf\u30fc\u30d6\u306a\u3089110Hz\uff5e1760Hz\u304c\u901a\u3055\u306a\u3044\u5468\u6ce2\u6570\u3068\u306a\u308a\u307e\u3059\u3002<br \/>\n\u306a\u304a\u3001\u5e2f\u57df\u5e45\u306f0\u3088\u308a\u5927\u304d\u3044\u5024\u3067\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002<\/p>\n<p><a href=\"https:\/\/www.utsbox.com\/wp-content\/uploads\/2015\/09\/20150921_Notch1.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.utsbox.com\/wp-content\/uploads\/2015\/09\/20150921_Notch1.png\" alt=\"20150921_Notch1\" width=\"762\" height=\"442\" class=\"alignnone size-full wp-image-868\" srcset=\"https:\/\/www.utsbox.com\/wp-content\/uploads\/2015\/09\/20150921_Notch1.png 762w, https:\/\/www.utsbox.com\/wp-content\/uploads\/2015\/09\/20150921_Notch1-300x174.png 300w\" sizes=\"auto, (max-width: 762px) 100vw, 762px\" \/><\/a><\/p>\n<h2 id=\"\u30ed\u30fc\u30b7\u30a7\u30eb\u30d5\u30d5\u30a3\u30eb\u30bf\">\u30ed\u30fc\u30b7\u30a7\u30eb\u30d5\u30d5\u30a3\u30eb\u30bf<\/h2>\n<p>\u30ed\u30fc\u30b7\u30a7\u30eb\u30d5\u30d5\u30a3\u30eb\u30bf\u306f\u3001\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570\u4ee5\u4e0b\u306e\u97f3\u58f0\u3092\u5897\u5e45\u91cf\u5206\u3060\u3051\u5897\u5e45\u3059\u308b\u30d5\u30a3\u30eb\u30bf\u3067\u3059\u3002\u4e0b\u8a18\u306e4\u3064\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u5468\u6ce2\u6570(\u5358\u4f4d\uff1aHz)<\/li>\n<li>\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570(\u5358\u4f4d\uff1aHz)<\/li>\n<li>\u30d5\u30a3\u30eb\u30bf\u306eQ\u5024<\/li>\n<li>\u5897\u5e45\u91cf(\u5358\u4f4d\uff1adB)<\/li>\n<\/ul>\n<p>\u30d5\u30a3\u30eb\u30bf\u4fc2\u6570\u306e\u6c42\u3081\u65b9\u306f\u4e0b\u8a18\u306e\u901a\u308a\u3067\u3059\u3002(C\/C++\u30b3\u30fc\u30c9\u30a4\u30e1\u30fc\u30b8)<\/p>\n<p>[crayon]<br \/>\n\/\/ \u305d\u308c\u305e\u308c\u306e\u5909\u6570\u306f\u4e0b\u8a18\u306e\u3068\u304a\u308a\u3068\u3059\u308b<br \/>\n\/\/ float samplerate \u2026 \u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u5468\u6ce2\u6570<br \/>\n\/\/ float freq \u2026 \u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570<br \/>\n\/\/ float q    \u2026 \u30d5\u30a3\u30eb\u30bf\u306eQ\u5024<br \/>\n\/\/ float gain \u2026 \u5897\u5e45\u91cf<br \/>\nfloat omega = 2.0f * 3.14159265f *  freq\u3000\/\u3000samplerate;<br \/>\nfloat alpha = sin(omega) \/ (2.0f * q);<br \/>\nfloat A     = pow(10.0f, (gain \/ 40.0f) );<br \/>\nfloat beta  = sqrt(A) \/ q;<\/p>\n<p>float a0 = (A + 1.0f)+(A &#8211; 1.0f) * cos(omega) + beta * sin(omega);<br \/>\nfloat a1 = -2.0f * ((A &#8211; 1.0f) + (A + 1.0f) * cos(omega));<br \/>\nfloat a2 = (A + 1.0f) + (A &#8211; 1.0f) * cos(omega) &#8211; beta * sin(omega);<br \/>\nfloat b0 =  A * ((A + 1.0f) &#8211; (A &#8211; 1.0f) * cos(omega) + beta * sin(omega));<br \/>\nfloat b1 =  2.0f * A * ((A &#8211; 1.0f) &#8211; (A + 1.0f) * cos(omega));<br \/>\nfloat b2 =  A * ((A + 1.0f) &#8211; (A-  1.0f) * cos(omega) &#8211; beta * sin(omega));<br \/>\n[\/crayon]<\/p>\n<p>\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570\u306f\u305d\u308c\u4ee5\u4e0b\u306e\u5468\u6ce2\u6570\u3092\u5897\u5e45\u3059\u308b\u5468\u6ce2\u6570\u3067\u3059\u3002(\u53b3\u5bc6\u306b\u306f\u51fa\u529b\u4fe1\u53f7\u304c\u6307\u5b9a\u3057\u305f\u5897\u5e45\u91cf\u306e\u534a\u5206\u3068\u306a\u308b\u5468\u6ce2\u6570\u3002\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570\u3088\u308a\u9ad8\u3044\u5468\u6ce2\u6570\u304b\u3089\u5897\u5e45\u304c\u59cb\u307e\u308a\u307e\u3059\u3002)<br \/>\n\u5897\u5e45\u91cf\u3092\u30de\u30a4\u30ca\u30b9\u306b\u3059\u308b\u3068\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570\u4ee5\u4e0b\u306e\u5468\u6ce2\u6570\u3092\u6e1b\u8870\u3055\u305b\u308b\u30d5\u30a3\u30eb\u30bf\u306b\u306a\u308a\u307e\u3059\u3002<br \/>\nQ\u5024\u306b\u3088\u308a\u3001\u5897\u5e45\u306e\u30ab\u30fc\u30d6\u3092\u5909\u66f4\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u304c\u3001\u5927\u304d\u304f\u3057\u3059\u304e\u308b\u3068\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570\u4ed8\u8fd1\u304c\u304c\u5f37\u8abf\u3055\u308c\u3066\u3057\u307e\u3044\u307e\u3059\u3002<br \/>\n\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570\u4ed8\u8fd1\u3092\u5f37\u8abf\u3057\u305f\u304f\u306a\u3044\u5834\u5408\u306f\u3001Q\u5024\u30921\/\u221a2\u306b\u3057\u307e\u3059\u3002\u306a\u304a\u3001Q\u5024\u306f0\u3088\u308a\u5927\u304d\u3044\u5024\u3067\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002<\/p>\n<p><a href=\"https:\/\/www.utsbox.com\/wp-content\/uploads\/2015\/09\/20150921_LowShelf1.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.utsbox.com\/wp-content\/uploads\/2015\/09\/20150921_LowShelf1.png\" alt=\"20150921_LowShelf1\" width=\"762\" height=\"442\" class=\"alignnone size-full wp-image-876\" srcset=\"https:\/\/www.utsbox.com\/wp-content\/uploads\/2015\/09\/20150921_LowShelf1.png 762w, https:\/\/www.utsbox.com\/wp-content\/uploads\/2015\/09\/20150921_LowShelf1-300x174.png 300w\" sizes=\"auto, (max-width: 762px) 100vw, 762px\" \/><\/a><br \/>\n<a href=\"https:\/\/www.utsbox.com\/wp-content\/uploads\/2015\/09\/20150921_LowShelf2.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.utsbox.com\/wp-content\/uploads\/2015\/09\/20150921_LowShelf2.png\" alt=\"20150921_LowShelf2\" width=\"762\" height=\"442\" class=\"alignnone size-full wp-image-877\" srcset=\"https:\/\/www.utsbox.com\/wp-content\/uploads\/2015\/09\/20150921_LowShelf2.png 762w, https:\/\/www.utsbox.com\/wp-content\/uploads\/2015\/09\/20150921_LowShelf2-300x174.png 300w\" sizes=\"auto, (max-width: 762px) 100vw, 762px\" \/><\/a><\/p>\n<h2 id=\"\u30cf\u30a4\u30b7\u30a7\u30eb\u30d5\u30d5\u30a3\u30eb\u30bf\">\u30cf\u30a4\u30b7\u30a7\u30eb\u30d5\u30d5\u30a3\u30eb\u30bf<\/h2>\n<p>\u30cf\u30a4\u30b7\u30a7\u30eb\u30d5\u30d5\u30a3\u30eb\u30bf\u306f\u3001\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570\u4ee5\u4e0a\u306e\u97f3\u58f0\u3092\u5897\u5e45\u91cf\u5206\u3060\u3051\u5897\u5e45\u3059\u308b\u30d5\u30a3\u30eb\u30bf\u3067\u3059\u3002\u4e0b\u8a18\u306e4\u3064\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u5468\u6ce2\u6570(\u5358\u4f4d\uff1aHz)<\/li>\n<li>\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570(\u5358\u4f4d\uff1aHz)<\/li>\n<li>\u30d5\u30a3\u30eb\u30bf\u306eQ\u5024<\/li>\n<li>\u5897\u5e45\u91cf(\u5358\u4f4d\uff1adB)<\/li>\n<\/ul>\n<p>\u30d5\u30a3\u30eb\u30bf\u4fc2\u6570\u306e\u6c42\u3081\u65b9\u306f\u4e0b\u8a18\u306e\u901a\u308a\u3067\u3059\u3002(C\/C++\u30b3\u30fc\u30c9\u30a4\u30e1\u30fc\u30b8)<\/p>\n<p>[crayon]<br \/>\n\/\/ \u305d\u308c\u305e\u308c\u306e\u5909\u6570\u306f\u4e0b\u8a18\u306e\u3068\u304a\u308a\u3068\u3059\u308b<br \/>\n\/\/ float samplerate \u2026 \u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u5468\u6ce2\u6570<br \/>\n\/\/ float freq \u2026 \u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570<br \/>\n\/\/ float q    \u2026 \u30d5\u30a3\u30eb\u30bf\u306eQ\u5024<br \/>\n\/\/ float gain \u2026 \u5897\u5e45\u91cf<br \/>\nfloat omega = 2.0f * 3.14159265f *  freq\u3000\/\u3000samplerate;<br \/>\nfloat alpha = sin(omega) \/ (2.0f * q);<br \/>\nfloat A     = pow(10.0f, (gain \/ 40.0f) );<br \/>\nfloat beta  = sqrt(A) \/ q;<\/p>\n<p>float a0 = (A + 1.0f) &#8211; (A &#8211; 1.0f) * cos(omega) + beta * sin(omega);<br \/>\nfloat a1 =  2.0f * ((A &#8211; 1.0f) &#8211; (A + 1.0f) * cos(omega));<br \/>\nfloat a2 = (A + 1.0f) &#8211; (A &#8211; 1.0f) * cos(omega) &#8211; beta * sin(omega);<br \/>\nfloat b0 =  A * ((A + 1.0f) + (A &#8211; 1.0f) * cos(omega) + beta * sin(omega));<br \/>\nfloat b1 = -2.0f * A * ((A &#8211; 1.0f) + (A + 1.0f) * cos(omega));<br \/>\nfloat b2 =  A * ((A + 1.0f) + (A &#8211; 1.0f) * cos(omega) &#8211; beta * sin(omega));<br \/>\n[\/crayon]<\/p>\n<p>\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570\u306f\u305d\u308c\u4ee5\u4e0a\u306e\u5468\u6ce2\u6570\u3092\u5897\u5e45\u3059\u308b\u5468\u6ce2\u6570\u3067\u3059\u3002(\u53b3\u5bc6\u306b\u306f\u51fa\u529b\u4fe1\u53f7\u304c\u6307\u5b9a\u3057\u305f\u5897\u5e45\u91cf\u306e\u534a\u5206\u3068\u306a\u308b\u5468\u6ce2\u6570\u3002\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570\u3088\u308a\u4f4e\u3044\u5468\u6ce2\u6570\u304b\u3089\u5897\u5e45\u304c\u59cb\u307e\u308a\u307e\u3059\u3002)<br \/>\n\u5897\u5e45\u91cf\u3092\u30de\u30a4\u30ca\u30b9\u306b\u3059\u308b\u3068\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570\u4ee5\u4e0a\u306e\u5468\u6ce2\u6570\u3092\u6e1b\u8870\u3055\u305b\u308b\u30d5\u30a3\u30eb\u30bf\u306b\u306a\u308a\u307e\u3059\u3002<br \/>\nQ\u5024\u306b\u3088\u308a\u3001\u5897\u5e45\u306e\u30ab\u30fc\u30d6\u3092\u5909\u66f4\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u304c\u3001\u5927\u304d\u304f\u3057\u3059\u304e\u308b\u3068\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570\u4ed8\u8fd1\u304c\u304c\u5f37\u8abf\u3055\u308c\u3066\u3057\u307e\u3044\u307e\u3059\u3002<br \/>\n\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570\u4ed8\u8fd1\u3092\u5f37\u8abf\u3057\u305f\u304f\u306a\u3044\u5834\u5408\u306f\u3001Q\u5024\u30921\/\u221a2\u306b\u3057\u307e\u3059\u3002\u306a\u304a\u3001Q\u5024\u306f0\u3088\u308a\u5927\u304d\u3044\u5024\u3067\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002<\/p>\n<p><a href=\"https:\/\/www.utsbox.com\/wp-content\/uploads\/2015\/09\/20150921_HighShelf1.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.utsbox.com\/wp-content\/uploads\/2015\/09\/20150921_HighShelf1.png\" alt=\"20150921_HighShelf1\" width=\"762\" height=\"442\" class=\"alignnone size-full wp-image-873\" srcset=\"https:\/\/www.utsbox.com\/wp-content\/uploads\/2015\/09\/20150921_HighShelf1.png 762w, https:\/\/www.utsbox.com\/wp-content\/uploads\/2015\/09\/20150921_HighShelf1-300x174.png 300w\" sizes=\"auto, (max-width: 762px) 100vw, 762px\" \/><\/a><br \/>\n<a href=\"https:\/\/www.utsbox.com\/wp-content\/uploads\/2015\/09\/20150921_HighShelf2.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.utsbox.com\/wp-content\/uploads\/2015\/09\/20150921_HighShelf2.png\" alt=\"20150921_HighShelf2\" width=\"762\" height=\"442\" class=\"alignnone size-full wp-image-874\" srcset=\"https:\/\/www.utsbox.com\/wp-content\/uploads\/2015\/09\/20150921_HighShelf2.png 762w, https:\/\/www.utsbox.com\/wp-content\/uploads\/2015\/09\/20150921_HighShelf2-300x174.png 300w\" sizes=\"auto, (max-width: 762px) 100vw, 762px\" \/><\/a><\/p>\n<h2 id=\"\u30d4\u30fc\u30ad\u30f3\u30b0\u30d5\u30a3\u30eb\u30bf\">\u30d4\u30fc\u30ad\u30f3\u30b0\u30d5\u30a3\u30eb\u30bf<\/h2>\n<p>\u30d4\u30fc\u30ad\u30f3\u30b0\u30d5\u30a3\u30eb\u30bf\u306f\u3001\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570\u3092\u4e2d\u5fc3\u3068\u3057\u305f\u5e2f\u57df\u5e45\u5206\u306e\u97f3\u58f0\u3092\u5897\u5e45\u91cf\u5206\u3060\u3051\u5897\u5e45\u3059\u308b\u30d5\u30a3\u30eb\u30bf\u3067\u3059\u3002\u4e0b\u8a18\u306e4\u3064\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u5468\u6ce2\u6570(\u5358\u4f4d\uff1aHz)<\/li>\n<li>\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570(\u5358\u4f4d\uff1aHz)<\/li>\n<li>\u5e2f\u57df\u5e45(\u5358\u4f4d\uff1aoctave)<\/li>\n<li>\u5897\u5e45\u91cf(\u5358\u4f4d\uff1adB)<\/li>\n<\/ul>\n<p>\u30d5\u30a3\u30eb\u30bf\u4fc2\u6570\u306e\u6c42\u3081\u65b9\u306f\u4e0b\u8a18\u306e\u901a\u308a\u3067\u3059\u3002(C\/C++\u30b3\u30fc\u30c9\u30a4\u30e1\u30fc\u30b8)<\/p>\n<p>[crayon]<br \/>\n\/\/ \u305d\u308c\u305e\u308c\u306e\u5909\u6570\u306f\u4e0b\u8a18\u306e\u3068\u304a\u308a\u3068\u3059\u308b<br \/>\n\/\/ float samplerate \u2026 \u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u5468\u6ce2\u6570<br \/>\n\/\/ float freq \u2026 \u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570<br \/>\n\/\/ float q    \u2026 \u30d5\u30a3\u30eb\u30bf\u306eQ\u5024<br \/>\n\/\/ float gain \u2026 \u5897\u5e45\u91cf<br \/>\nfloat omega = 2.0f * 3.14159265f *  freq\u3000\/\u3000samplerate;<br \/>\nfloat alpha = sin(omega) * sinh(log(2.0f) \/ 2.0 * bw * omega \/ sin(omega));<br \/>\nfloat A     = pow(10.0f, (gain \/ 40.0f) );<\/p>\n<p>float a0 =  1.0f + alpha \/ A;<br \/>\nfloat a1 = -2.0f * cos(omega);<br \/>\nfloat a2 =  1.0f &#8211; alpha \/ A;<br \/>\nfloat b0 =  1.0f + alpha * A;<br \/>\nfloat b1 = -2.0f * cos(omega);<br \/>\nfloat b2 =  1.0f &#8211; alpha * A;<br \/>\n[\/crayon]<\/p>\n<p>\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570\u306f\u5897\u5e45\u3059\u308b\u5e2f\u57df\u306e\u4e2d\u5fc3\u3068\u306a\u308b\u5468\u6ce2\u6570\u3067\u3059\u3002\u5e2f\u57df\u5e45\u306f\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570\u304b\u3089\u3069\u3053\u307e\u3067\u306e\u5468\u6ce2\u6570\u3092\u901a\u3059\u304b\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002(\u53b3\u5bc6\u306b\u306f\u51fa\u529b\u4fe1\u53f7\u304c\u6307\u5b9a\u3057\u305f\u5897\u5e45\u91cf\u306e\u534a\u5206\u3068\u306a\u308b\u5468\u6ce2\u6570\u3002)<br \/>\n\u5897\u5e45\u91cf\u3092\u30de\u30a4\u30ca\u30b9\u306b\u3059\u308b\u3068\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570\u5468\u8fba\u306e\u97f3\u58f0\u3092\u6e1b\u8870\u3055\u305b\u308b\u30d5\u30a3\u30eb\u30bf\u306b\u306a\u308a\u307e\u3059\u3002<br \/>\n\u4f8b\u3048\u3070\u3001\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570\u304c440Hz\u3067\u5e2f\u57df\u5e45\u304c1\u30aa\u30af\u30bf\u30fc\u30d6\u306a\u3089\u3001220Hz\uff5e880Hz\u3067\u30012\u30aa\u30af\u30bf\u30fc\u30d6\u306a\u3089110Hz\uff5e1760Hz\u304c\u5897\u5e45\u3059\u308b\u5468\u6ce2\u6570\u3068\u306a\u308a\u307e\u3059\u3002<br \/>\n\u306a\u304a\u3001\u5e2f\u57df\u5e45\u306f0\u3088\u308a\u5927\u304d\u3044\u5024\u3067\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002<\/p>\n<p><a href=\"https:\/\/www.utsbox.com\/wp-content\/uploads\/2015\/09\/20150921_Peaking1.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.utsbox.com\/wp-content\/uploads\/2015\/09\/20150921_Peaking1.png\" alt=\"20150921_Peaking1\" width=\"762\" height=\"442\" class=\"alignnone size-full wp-image-869\" srcset=\"https:\/\/www.utsbox.com\/wp-content\/uploads\/2015\/09\/20150921_Peaking1.png 762w, https:\/\/www.utsbox.com\/wp-content\/uploads\/2015\/09\/20150921_Peaking1-300x174.png 300w\" sizes=\"auto, (max-width: 762px) 100vw, 762px\" \/><\/a><br \/>\n<a href=\"https:\/\/www.utsbox.com\/wp-content\/uploads\/2015\/09\/20150921_Peaking2.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.utsbox.com\/wp-content\/uploads\/2015\/09\/20150921_Peaking2.png\" alt=\"20150921_Peaking2\" width=\"762\" height=\"442\" class=\"alignnone size-full wp-image-870\" srcset=\"https:\/\/www.utsbox.com\/wp-content\/uploads\/2015\/09\/20150921_Peaking2.png 762w, https:\/\/www.utsbox.com\/wp-content\/uploads\/2015\/09\/20150921_Peaking2-300x174.png 300w\" sizes=\"auto, (max-width: 762px) 100vw, 762px\" \/><\/a><\/p>\n<h2 id=\"\u30aa\u30fc\u30eb\u30d1\u30b9\u30d5\u30a3\u30eb\u30bf\">\u30aa\u30fc\u30eb\u30d1\u30b9\u30d5\u30a3\u30eb\u30bf<\/h2>\n<p>\u30aa\u30fc\u30eb\u30d1\u30b9\u30d5\u30a3\u30eb\u30bf\u306f\u3001\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570\u5468\u8fba\u306e\u4f4d\u76f8\u306e\u307f\u3092\u5909\u3048\u307e\u3059\u3002\u4e0b\u8a18\u306e3\u3064\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u5468\u6ce2\u6570(\u5358\u4f4d\uff1aHz)<\/li>\n<li>\u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570(\u5358\u4f4d\uff1aHz)<\/li>\n<li>\u30d5\u30a3\u30eb\u30bf\u306eQ\u5024<\/li>\n<\/ul>\n<p>\u30d5\u30a3\u30eb\u30bf\u4fc2\u6570\u306e\u6c42\u3081\u65b9\u306f\u4e0b\u8a18\u306e\u901a\u308a\u3067\u3059\u3002(C\/C++\u30b3\u30fc\u30c9\u30a4\u30e1\u30fc\u30b8)<\/p>\n<p>[crayon]<br \/>\n\/\/ \u305d\u308c\u305e\u308c\u306e\u5909\u6570\u306f\u4e0b\u8a18\u306e\u3068\u304a\u308a\u3068\u3059\u308b<br \/>\n\/\/ float samplerate \u2026 \u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u5468\u6ce2\u6570<br \/>\n\/\/ float freq \u2026 \u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570<br \/>\n\/\/ float q    \u2026 \u30d5\u30a3\u30eb\u30bf\u306eQ\u5024<br \/>\nfloat omega = 2.0f * 3.14159265f *  freq\u3000\/\u3000samplerate;<br \/>\nfloat alpha = sin(omega) \/ (2.0f * q);<\/p>\n<p>float a0 =  1.0f + alpha;<br \/>\nfloat a1 = -2.0f * cos(omega);<br \/>\nfloat a2 =  1.0f &#8211; alpha;<br \/>\nfloat b0 =  1.0f &#8211; alpha;<br \/>\nfloat b1 = -2.0f * cos(omega);<br \/>\nfloat b2 =  1.0f + alpha;<br \/>\n[\/crayon]<\/p>\n<p>Q\u5024\u306f0\u3088\u308a\u5927\u304d\u3044\u5024\u3067\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002<br \/>\n\u3053\u306e\u30d5\u30a3\u30eb\u30bf\u306f\u3042\u307e\u308a\u4f7f\u7528\u3059\u308b\u6a5f\u4f1a\u306f\u306a\u3044\u3068\u601d\u308f\u308c\u307e\u3059\u3002(\u30d5\u30a7\u30a4\u30b6\u30fc\u3084\u30ea\u30d0\u30fc\u30d6\u306a\u3069\u3067\u4f7f\u308f\u308c\u307e\u3059\u3002)<\/p>\n<p>\u5468\u6ce2\u6570\u7279\u6027\u306b\u3064\u3044\u3066\u306f\u7701\u7565\u3057\u307e\u3059\u3002<\/p>\n<hr \/>\n<h1 id=\"\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9(\u30ed\u30fc\u30d1\u30b9\u30d5\u30a3\u30eb\u30bf)\">\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9(\u30ed\u30fc\u30d1\u30b9\u30d5\u30a3\u30eb\u30bf)<\/h1>\n<p>\u30ed\u30fc\u30d1\u30b9\u30d5\u30a3\u30eb\u30bf\u3092\u9069\u7528\u3059\u308b\u95a2\u6570\u306e\u4f8b\u3092\u4e0b\u8a18\u306b\u8a18\u8f09\u3044\u305f\u3057\u307e\u3059\u3002<\/p>\n<p>\u306a\u304a\u3001\u672c\u30b5\u30a4\u30c8\u3067\u306fVST\u30d7\u30e9\u30b0\u30a4\u30f3\u4f5c\u6210\u3092\u8996\u91ce\u306b\u5165\u308c\u3066\u3044\u307e\u3059\u306e\u3067\u3001\u5165\u529b\u4fe1\u53f7\u30fb\u51fa\u529b\u4fe1\u53f7\u306ffloat\u578b\u3068\u3057\u3066\u304a\u308a\u307e\u3059\u3002<br \/>\nWAV\u30d5\u30a1\u30a4\u30eb\u7b49\u306b\u9069\u7528\u3059\u308b\u305f\u3081\u306bint\u578b\u3084short\u578b\u7b49\u306e\u6574\u6570\u578b\u3092\u4f7f\u7528\u3055\u308c\u308b\u5834\u5408\u306f\u3001\u578b\u3092\u30ad\u30e3\u30b9\u30c8\u3057\u3066\u5229\u7528\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p>\u307e\u305f\u3001\u30d5\u30a3\u30eb\u30bf\u4fc2\u6570\u3082float\u578b\u3068\u3057\u3066\u304a\u308a\u307e\u3059\u304c\u3001\u3082\u3061\u308d\u3093double\u578b\u3067\u3082\u304b\u307e\u3044\u307e\u305b\u3093\u3002<\/p>\n<p>[crayon]<br \/>\n\/\/ float input[]  \u2026\u5165\u529b\u4fe1\u53f7\u306e\u683c\u7d0d\u3055\u308c\u305f\u30d0\u30c3\u30d5\u30a1\u3002<br \/>\n\/\/ flaot output[] \u2026\u30d5\u30a3\u30eb\u30bf\u51e6\u7406\u3057\u305f\u5024\u3092\u66f8\u304d\u51fa\u3059\u51fa\u529b\u4fe1\u53f7\u306e\u30d0\u30c3\u30d5\u30a1\u3002<br \/>\n\/\/ int   size     \u2026\u5165\u529b\u4fe1\u53f7\u30fb\u51fa\u529b\u4fe1\u53f7\u306e\u30d0\u30c3\u30d5\u30a1\u306e\u30b5\u30a4\u30ba\u3002<br \/>\n\/\/ float samplerate \u2026 \u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u5468\u6ce2\u6570\u3002<br \/>\n\/\/ float freq \u2026 \u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570\u3002<br \/>\n\/\/ float q    \u2026 \u30d5\u30a3\u30eb\u30bf\u306eQ\u5024\u3002<br \/>\nvoid lowpass(float input[], float output[], int size, float samplerate, float freq, float q)<br \/>\n{<br \/>\n\t\/\/ \u30d5\u30a3\u30eb\u30bf\u4fc2\u6570\u3092\u8a08\u7b97\u3059\u308b<br \/>\n\tfloat omega = 2.0f * 3.14159265f *  freq\u3000\/\u3000samplerate;<br \/>\n\tfloat alpha = sin(omega) \/ (2.0f * q);<\/p>\n<p>\tfloat a0 =  1.0f + alpha;<br \/>\n\tfloat a1 = -2.0f * cos(omega);<br \/>\n\tfloat a2 =  1.0f &#8211; alpha;<br \/>\n\tfloat b0 = (1.0f &#8211; cos(omega)) \/ 2.0f;<br \/>\n\tfloat b1 =  1.0f &#8211; cos(omega);<br \/>\n\tfloat b2 = (1.0f &#8211; cos(omega)) \/ 2.0f;<\/p>\n<p>\t\/\/ \u30d5\u30a3\u30eb\u30bf\u8a08\u7b97\u7528\u306e\u30d0\u30c3\u30d5\u30a1\u5909\u6570\u3002<br \/>\n\tfloat in1  = 0.0f;<br \/>\n\tfloat in2  = 0.0f;<br \/>\n\tfloat out1 = 0.0f;<br \/>\n\tfloat out2 = 0.0f;<\/p>\n<p>\t\/\/ \u30d5\u30a3\u30eb\u30bf\u3092\u9069\u7528<br \/>\n\tfor(int i = 0; i < size; i++)\n\t{\n\t\t\/\/ \u5165\u529b\u4fe1\u53f7\u306b\u30d5\u30a3\u30eb\u30bf\u3092\u9069\u7528\u3057\u3001\u51fa\u529b\u4fe1\u53f7\u3068\u3057\u3066\u66f8\u304d\u51fa\u3059\u3002\n\t\toutput[i] = b0\/a0 * input[i] + b1\/a0 * in1  + b2\/a0 * in2\n\t\t                             - a1\/a0 * out1 - a2\/a0 * out2;\n\n\t\tin2  = in1;       \/\/ 2\u3064\u524d\u306e\u5165\u529b\u4fe1\u53f7\u3092\u66f4\u65b0\n\t\tin1  = input[i];  \/\/ 1\u3064\u524d\u306e\u5165\u529b\u4fe1\u53f7\u3092\u66f4\u65b0\n\n\t\tout2 = out1;      \/\/ 2\u3064\u524d\u306e\u51fa\u529b\u4fe1\u53f7\u3092\u66f4\u65b0\n\t\tout1 = output[i]; \/\/ 1\u3064\u524d\u306e\u51fa\u529b\u4fe1\u53f7\u3092\u66f4\u65b0\n\t}\n}\n[\/crayon]\n\n\n\n<hr \/>\n<h1 id=\"\u30d5\u30a3\u30eb\u30bf\u306e\u5b9f\u88c5\u4f8b\u3068\u30a8\u30d5\u30a7\u30af\u30bf\u30fc\u5b9f\u88c5\u4f8b\">\u30d5\u30a3\u30eb\u30bf\u306e\u5b9f\u88c5\u4f8b\u3068\u30a8\u30d5\u30a7\u30af\u30bf\u30fc\u5b9f\u88c5\u4f8b<\/h1>\n<p>\u53c2\u8003\u307e\u3067\u306b\u3053\u3053\u3067\u8aac\u660e\u3057\u305f\u30d5\u30a3\u30eb\u30bf\u306b\u3064\u3044\u3066\u30af\u30e9\u30b9\u5316\u3057\u305f\u3082\u306e\u3092\u4e0b\u8a18\u306b\u8a18\u8f09\u3057\u3066\u304a\u308a\u307e\u3059\u3002<br \/>\n\u2192<a href=\"https:\/\/www.utsbox.com\/?page_id=728\" title=\"\u7c21\u5358\u306a\u30c7\u30b8\u30bf\u30eb\u30d5\u30a3\u30eb\u30bf\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\">\u7c21\u5358\u306a\u30c7\u30b8\u30bf\u30eb\u30d5\u30a3\u30eb\u30bf\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9<\/a><\/p>\n<p>\u307e\u305f\u3001\u4e0a\u8a18\u306e\u30d5\u30a3\u30eb\u30bf\u30af\u30e9\u30b9\u3092\u5229\u7528\u3057\u305f\u30a8\u30d5\u30a7\u30af\u30bf\u30fc\u306e\u5b9f\u88c5\u4f8b\u306a\u3069\u3082\u4e0b\u8a18\u306b\u8a18\u8f09\u3057\u3066\u304a\u308a\u307e\u3059\u3002<br \/>\n\u2192<a href=\"https:\/\/www.utsbox.com\/?page_id=1316#\u30a8\u30d5\u30a7\u30af\u30bf\u30fc\u306e\u5b9f\u88c5\u4f8b\" title=\"\u30a8\u30d5\u30a7\u30af\u30bf\u30fc\u306e\u5b9f\u88c5\u4f8b\">\u30a8\u30d5\u30a7\u30af\u30bf\u30fc\u306e\u5b9f\u88c5\u4f8b<\/a><\/p>\n<hr \/>\n<h1 id=\"\u6700\u5f8c\u306b\">\u6700\u5f8c\u306b<\/h1>\n<p>\u3053\u3053\u3067\u306f\u5404\u30d5\u30a3\u30eb\u30bf\u306e\u7279\u6027\u3084\u8a73\u7d30\u306f\u3001\u3042\u3048\u3066\u3075\u308c\u305a\u306b\u5b9f\u88c5\u65b9\u6cd5\u3092\u7c21\u5358\u306b\u7d39\u4ecb\u3055\u305b\u3066\u3044\u305f\u3060\u304d\u307e\u3057\u305f\u3002<br \/>\n\u3053\u308c\u3092\u4f7f\u7528\u3059\u308c\u3070\u30a8\u30d5\u30a7\u30af\u30bf\u30fc\u3084\u30c7\u30b8\u30bf\u30eb\u697d\u5668\u306e\u4f5c\u6210\u304c\u3088\u308a\u3084\u308a\u3084\u3059\u304f\u306a\u308b\u304b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n<p>\u306a\u304a\u3001\u3053\u3053\u3067\u7d39\u4ecb\u3057\u305f\u4fc2\u6570\u306e\u8a08\u7b97\u65b9\u6cd5\u3084\u5b9f\u88c5\u65b9\u6cd5\u306f\u4e00\u4f8b\u3067\u3057\u304b\u3042\u308a\u307e\u305b\u3093\u3002<br \/>\n\u30d0\u30f3\u30c9\u30d1\u30b9\u30d5\u30a3\u30eb\u30bf\u3084\u30ce\u30c3\u30c1\u30d5\u30a3\u30eb\u30bf\u3067\u306f\u5e2f\u57df\u5e45\u306e\u4ee3\u308f\u308a\u306bQ\u3092\u5229\u7528\u3057\u305f\u308a\u3001\u30ed\u30fc\u30b7\u30a7\u30eb\u30d5\u30d5\u30a3\u30eb\u30bf\u3084\u30cf\u30a4\u30b7\u30a7\u30eb\u30d5\u30d5\u30a3\u30eb\u30bf\u3067\u306fQ\u306e\u4ee3\u308f\u308a\u306b\u30b9\u30ed\u30fc\u30d7\u3068\u3044\u3046\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<br \/>\n\u30d5\u30a3\u30eb\u30bf\u7279\u6027\u3084\u8a73\u7d30\u306a\u5185\u5bb9\u306b\u3064\u3044\u3066\u77e5\u308a\u305f\u3044\u65b9\u306f\u3001\u691c\u7d22\u3084\u3088\u308a\u8a73\u7d30\u306b\u8a18\u8f09\u3055\u308c\u3066\u3044\u308b\u53c2\u8003\u30b5\u30a4\u30c8\u69d8\u7b49\u3067\u3054\u78ba\u8a8d\u3044\u305f\u3060\u3051\u308c\u3070\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n<hr \/>\n<h1 id=\"\u53c2\u8003\u30b5\u30a4\u30c8\u69d8\">\u53c2\u8003\u30b5\u30a4\u30c8\u69d8<\/h1>\n<p>MusicDSP \u69d8 &#8211; Audio-EQ-Cookbook(\u82f1\u8a9e)<br \/>\n<a href=\"https:\/\/www.musicdsp.org\/files\/Audio-EQ-Cookbook.txt\" target=\"_blank\" rel=\"noopener\">https:\/\/www.musicdsp.org\/files\/Audio-EQ-Cookbook.txt<\/a><\/p>\n<p>MusicDSP \u69d8 &#8211; C++ class implementation of RBJ Filters(\u82f1\u8a9e)<br \/>\n<a href=\"www.musicdsp.org\/files\/CFxRbjFilter.h\" target=\"_blank\" rel=\"noopener\">www.musicdsp.org\/files\/CFxRbjFilter.h<\/a><\/p>\n<p>g200kg \u69d8 &#8211; BiQuad\u30d5\u30a3\u30eb\u30bf\u306e\u6599\u7406\u6cd5<br \/>\n<a href=\"https:\/\/www.g200kg.com\/jp\/docs\/makingeffects\/78743dea3f70c8c2f081b7d5187402ec75e6a6b8.html\" target=\"_blank\" rel=\"noopener\">https:\/\/www.g200kg.com\/jp\/docs\/makingeffects\/78743dea3f70c8c2f081b7d5187402ec75e6a6b8.html<\/a><\/p>\n<p>++C++;\/\/ \u672a\u78ba\u8a8d\u98db\u884c C \u69d8 &#8211; \u53cc2\u6b21\u30d5\u30a3\u30eb\u30bf<br \/>\n<a href=\"https:\/\/ufcpp.net\/study\/digital_filter\/biquad.html\" target=\"_blank\" rel=\"noopener\">https:\/\/ufcpp.net\/study\/digital_filter\/biquad.html<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u7c21\u5358\u306a\u30c7\u30b8\u30bf\u30eb\u30d5\u30a3\u30eb\u30bf\u306e\u5b9f\u88c5 \u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u30c7\u30b8\u30bf\u30eb\u697d\u5668\u3084\u30a8\u30d5\u30a7\u30af\u30bf\u30fc\u306a\u3069\u306e\u4f5c\u6210\u3092\u4f5c\u6210\u3057\u3066\u3044\u308b\u3068\u3001\u5fc5\u305a\u5fc5\u8981\u306b\u306a\u3063\u3066\u304f\u308b\u306e\u304c\u30c7\u30b8\u30bf\u30eb\u30d5\u30a3\u30eb\u30bf(\u30ed\u30fc\u30d1\u30b9\u30d5\u30a3\u30eb\u30bf\u3084\u30cf\u30a4\u30d1\u30b9\u30d5\u30a3\u30eb\u30bf\u7b49)\u3067\u3059\u3002 \u3057\u304b\u3057\u3001\u300c1,000Hz\u4ee5\u4e0b\u3092\u901a\u3059\u30ed [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":100,"comment_status":"open","ping_status":"closed","template":"","meta":{"jetpack_post_was_ever_published":false,"footnotes":""},"class_list":["post-523","page","type-page","status-publish","hentry"],"aioseo_notices":[],"jetpack_shortlink":"https:\/\/wp.me\/P5fXUX-8r","jetpack_sharing_enabled":true,"jetpack_likes_enabled":true,"_links":{"self":[{"href":"https:\/\/www.utsbox.com\/index.php?rest_route=\/wp\/v2\/pages\/523","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.utsbox.com\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.utsbox.com\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.utsbox.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.utsbox.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=523"}],"version-history":[{"count":23,"href":"https:\/\/www.utsbox.com\/index.php?rest_route=\/wp\/v2\/pages\/523\/revisions"}],"predecessor-version":[{"id":3828,"href":"https:\/\/www.utsbox.com\/index.php?rest_route=\/wp\/v2\/pages\/523\/revisions\/3828"}],"wp:attachment":[{"href":"https:\/\/www.utsbox.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=523"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}