{"id":373,"date":"2012-11-18T10:00:40","date_gmt":"2012-11-18T01:00:40","guid":{"rendered":"http:\/\/fpga.cool.coocan.jp\/wordpress\/?p=373"},"modified":"2012-11-18T10:00:40","modified_gmt":"2012-11-18T01:00:40","slug":"dsd%e5%8e%9f%e7%90%86%e5%9f%ba%e6%9d%bf","status":"publish","type":"post","link":"http:\/\/fpga.cool.coocan.jp\/wordpress\/?p=373","title":{"rendered":"DSD\u539f\u7406\u57fa\u677f"},"content":{"rendered":"<p>\u305d\u306e\u6614\uff1fDSD\u4fe1\u53f7\u306f\u62b5\u6297\uff11\u672c\u3067\u30a2\u30ca\u30ed\u30b0\u306b\u5909\u63db\u3067\u304d\u308b\u3088\u3046\u306b\u8a00\u308f\u308c\u3066\u3044\u305f\u3053\u3068\u304c\u3042\u3063\u305f\u3088\u3046\u306b\u8a18\u61b6\u3057\u3066\u3044\u307e\u3059\u3002\u62b5\u6297\uff11\u672c\u3068\u3044\u3046\u306e\u306f\u6975\u7aef\u3067\u3059\u304c\u3001\u30c7\u30eb\u30bf\u30b7\u30b0\u30de\u306e\u30ce\u30a4\u30ba\u3092\u53d6\u3063\u3066\u3057\u307e\u3048\u3070\u6b8b\u308a\u306f\u4fe1\u53f7\u3067\u3059\u304b\u3089\u3001\u518d\u751f\u3059\u308b\u306e\u304cDSD\u4fe1\u53f7\u3060\u3051\u3067\u3042\u308c\u3070\u3001\u300cDAC\u81ea\u4f5c\u306b\u306f\u5e02\u8ca9\u306eDAC\u30c1\u30c3\u30d7\u304c\u5fc5\u9808\u300d\u3068\u3044\u3046\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u304a\u554f\u3044\u5408\u308f\u305b\u3092\u9802\u304f\u305f\u3073\u306b\u300c\u8fd1\u3044\u3046\u3061\u306b\u300d\u3068\u56de\u7b54\u3057\u3066\u304a\u308a\u307e\u3057\u305f\u304c\u3001\u79c1\u3082\u5618\u3092\u3064\u304b\u305a\u306b\u6e08\u307f\u305d\u3046\uff1f\u3067\u3059\u3002<\/p>\n<p><img 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href=\"http:\/\/fpga.cool.coocan.jp\/electrart\/FIRTST.pdf\">\u56de\u8def\u56f3<\/a><\/p>\n<p>\u4eca\u56de\u3001\u307e\u3068\u3081\u3066\u4f5c\u308b\u306e\u306b\u5408\u308f\u305b\u3066\u539f\u7406\u57fa\u677f\u306e\u30ec\u30b8\u30b9\u30c8\u3092\u9752\u306b\u3057\u3066\u307f\u307e\u3057\u305f\u3002\u8868\u9762\u51e6\u7406\u306f\u91d1\u30e1\u30c3\u30ad\u306b\u3057\u3066\u3082\u3089\u3044\u307e\u3057\u305f\u3002\u00a0<\/p>\n<p>DSD\u306e\u30d5\u30a3\u30eb\u30bf\u306f\u3001\u4eca\u56de\u3082\u5909\u308f\u3089\u305a\u306b8TAP\u30a2\u30ca\u30ed\u30b0FIR\u30d5\u30a3\u30eb\u30bf\uff0b\u30aa\u30da\u30a2\u30f3\u30d7\u306b\u3088\u308bLPF\u3001\u3068\u3044\u3046\uff12\u6bb5\u69cb\u6210\u69cb\u6210\u306b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u30a2\u30ca\u30ed\u30b0\u306eFIR\u30d5\u30a3\u30eb\u30bf\u306b\u95a2\u3057\u3066\u306f\u3001\u624b\u5143\u306b\u3042\u308b\u30d5\u30a3\u30eb\u30bf\u8a2d\u8a08\u30bd\u30d5\u30c8\u3092\u4f7f\u3063\u3066\u307f\u307e\u3057\u305f\u3002<\/p>\n<p>DSD\u306f\u3001\u305f\u3068\u3048\u3070DSD64\u306e\u4fe1\u53f7\u3092\u8003\u3048\u305f\u5834\u5408\u30011*fs(44.1kHz)\u304f\u3089\u3044\u307e\u3067\u306f\u30d5\u30e9\u30c3\u30c8\u306b\u901a\u904e\u3055\u305b\u305f\u3044\u3068\u3053\u308d\u3067\u3059\u3002\u30ca\u30a4\u30ad\u30b9\u30c8\u5468\u6ce2\u657032fs\u3092\u6b63\u898f\u5316\u3057\u3066&#8221;0.5&#8243; 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loading=\"lazy\" decoding=\"async\" style=\"vertical-align: text-bottom;\" src=\"http:\/\/fpga.cool.coocan.jp\/electrart\/image201211\/2.jpg\" alt=\"\" width=\"480\" height=\"484\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" style=\"vertical-align: text-bottom;\" src=\"http:\/\/fpga.cool.coocan.jp\/electrart\/image201211\/3.jpg\" alt=\"\" width=\"480\" height=\"484\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" style=\"vertical-align: text-bottom;\" src=\"http:\/\/fpga.cool.coocan.jp\/electrart\/image201211\/4.jpg\" alt=\"\" width=\"480\" height=\"484\" 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loading=\"lazy\" decoding=\"async\" style=\"vertical-align: text-bottom;\" src=\"http:\/\/fpga.cool.coocan.jp\/electrart\/image201211\/chart.jpg\" alt=\"\" width=\"257\" height=\"453\" \/>\u00a0<\/p>\n<p>\u00a0<\/p>\n<p>\u5909\u8abf\u7387\u304c50%\u306eDSD\u4fe1\u53f7\u3092\u5165\u308c\u308b\u5834\u5408\u3001DFF 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