{"id":369,"date":"2012-10-19T21:17:33","date_gmt":"2012-10-19T12:17:33","guid":{"rendered":"http:\/\/fpga.cool.coocan.jp\/wordpress\/?p=369"},"modified":"2012-10-19T21:17:33","modified_gmt":"2012-10-19T12:17:33","slug":"%e3%81%bb%e3%81%bc%e5%ae%8c%e6%88%90","status":"publish","type":"post","link":"http:\/\/fpga.cool.coocan.jp\/wordpress\/?p=369","title":{"rendered":"P2D\u57fa\u677f(PCM2DSD)\u3001\u307b\u307c\u5b8c\u6210"},"content":{"rendered":"

\u3060\u3044\u3076\u9045\u304f\u306a\u3063\u3066\u3057\u307e\u3044\u307e\u3057\u305f\u304c\u3001PCM2DSD\u57fa\u677f\u306e\u8a2d\u8a08\u304c\u307b\u3068\u3093\u3069\u5b8c\u6210\u3057\u3001\u6765\u6708\u4e0a\u65ec\u306b\u30ea\u30ea\u30fc\u30b9\u306e\u904b\u3073\u3068\u306a\u308a\u307e\u3057\u305f\u3002\u4eca\u6708\u306e26\u65e5\u306b\u5de5\u5834\u304b\u3089\u30d7\u30ea\u30f3\u30c8\u57fa\u677f\u304c\u7d0d\u54c1\u3055\u308c\u308b\u4e88\u5b9a\u3067\u3059\u306e\u3067\u3001\u3059\u3050\u306b\u5b9f\u88c5\u5c4b\u3055\u3093\u306b\u304a\u9858\u3044\u3057\u3066\u90e8\u54c1\u3092\u8f09\u305b\u3066\u30ea\u30d5\u30ed\u30fc\u3057\u3066\u3082\u3089\u3044\u307e\u3059\u3002\u3053\u308c\u306b\u5927\u4f531\u9031\u9593\u304b\u308910\u65e5\u7a0b\u5ea6\u8981\u3057\u307e\u3059\u3002<\/p>\n

\"\"<\/p>\n

\u57fa\u677f\u30b5\u30a4\u30ba\u3068\u7a74\u4f4d\u7f6e\u306fUDA\u57fa\u677f\u3068\u5171\u901a\u3067\u3059\u304c\u3001\u30b3\u30cd\u30af\u30bf\u5074\u306b\u306f\u7a74\u306f\u7121\u304f\u3001UDA\u57fa\u677f\u3068\u30b9\u30bf\u30c3\u30af\u3059\u308b\u5834\u5408\u3067\u3082\u30ea\u30a2\u30d1\u30cd\u30eb\u306b\u30b3\u30cd\u30af\u30bf\u3092\u56fa\u5b9a\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

\u5165\u529b\u306fI2S\u3068S\/PDIF\u306e2\u7cfb\u7d71\u3067S\/PDIF\u306f3\u5165\u529b\u3001I2S\u306f2\u5165\u529b\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002I2S\u5165\u529b\u306fUDA\u57fa\u677f\u306eI2S\u51fa\u529b\u3092\u76f4\u63a5\u3064\u306a\u3050\u30dd\u30fc\u30c8\u3068(3.3V CMOS)\u3001HDMI\u30b3\u30cd\u30af\u30bf\u3092\u4f7f\u3063\u305fLVDS\u306e2\u7a2e\u985e\u304b\u3089\u9078\u629e\u3057\u307e\u3059\u3002<\/p>\n

I2S\u5165\u529b\u304b\u3089DSD\u304c\u5165\u529b\u3057\u305f\u3089\u51fa\u529b\u306fDSD\u304c\u305d\u306e\u307e\u307e\u30b9\u30eb\u30fc\u3067\u51fa\u307e\u3059(UDA\u57fa\u677f\u304b\u3089”DSD_H”\u304c’H’\u3067\u6765\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059)\u3002\u306a\u304a\u3001I2S\u30dd\u30fc\u30c8\u304b\u3089\u306eSCLK\u5165\u529b\u5468\u6ce2\u6570\u306f22.5792MHz\/24.576MHz\u306e\u307f\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u307e\u3059\u3002<\/p>\n

PCM\u5165\u529b\u6642\u306b\u306f\u3001\u901a\u5e38\u30e2\u30fc\u30c9\u3067\u306f\u5165\u529b\u306e\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u5468\u6ce2\u6570\u306b\u95a2\u4fc2\u306a\u304f\u51fa\u529b\u306f11.2\/12.\u00a02MHz DSD\u3068\u306a\u308a\u307e\u3059\u3002\u5165\u529b\u304c44.1\/48kHz\u306e\u6642\u306fDSD256\u51fa\u529b\u3068\u3044\u3046\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n

\u3055\u3089\u306b\u3001\u5165\u529b\u306e\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u5468\u6ce2\u6570\u304c88.2kHz\u4ee5\u4e0a\u306e\u5834\u5408\u306b\u306f\u51fa\u529b\u304c22.5\/24.5MHz DSD\u3068\u306a\u308b\u30e2\u30fc\u30c9\u3082SW\u3067\u9078\u629e\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u305f\u3002\u305f\u3060\u3057\u3001\u518d\u751f\u3067\u304d\u308bDAC\u304c\u3042\u308b\u304b\u3069\u3046\u304b\u306f\u5b9a\u304b\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u805e\u304f\u3068\u3053\u308d\u306b\u3088\u308b\u3068ES9018S\u306f\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u3089\u3057\u3044\u3067\u3059\u304c\u3001DPLL\u304c\u5bb9\u6613\u306b\u30ed\u30c3\u30af\u3059\u308b\u304b\u3069\u3046\u304b\u306f\u307e\u305f\u5225\u554f\u984c\u3068\u306a\u308a\u307e\u3059\u3002\u8155\u306b\u899a\u3048\u306e\u3042\u308b\u65b9\u306e\u305f\u3081\u306b\u3001\u5165\u529b\u306b\u30ed\u30c3\u30af\u3057\u305f90.3168\/98.304MHz\u306eMCLK\u3092\u51fa\u529b\u3059\u308b\u30b3\u30cd\u30af\u30bf\u3092\u8a2d\u3051\u307e\u3057\u305f\u3002<\/p>\n

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\u30c7\u30b8\u30bf\u30eb\u30d5\u30a3\u30eb\u30bf\u00a0\u306b\u3082SW\u3067\u9078\u629e\u3067\u304d\u308b\u97f3\u8cea\u30aa\u30d7\u30b7\u30e7\u30f3\u3092\u4ed8\u3051\u3088\u3046\u304b\u3069\u3046\u304b\u601d\u6848\u4e2d\u3067\u3059\u3002\u30d5\u30a3\u30eb\u30bf\u306e\u304b\u304b\u308a\u5177\u5408\u3092\u7de9\u3084\u304b\u306b\u3059\u308b\u3082\u306e\u3092\u8003\u3048\u3066\u3044\u307e\u3059\u304c\u3001\u30ca\u30a4\u30ad\u30b9\u30c8\u5468\u6ce2\u6570\u306e\u300c\u5916\u5074\u300d\u306b\u76db\u5927\u306b\u304a\u6f0f\u3089\u3057\u3059\u308b\u69d8\u306a\u7279\u6027\u306e\u3082\u306e\u306f\u3042\u307e\u308a\u597d\u304d\u3067\u306f\u306a\u3044\u306e\u3067\u3001\u7279\u6027\u7684\u306b\u306f\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u30d5\u30a3\u30eb\u30bf\u3068\u4f3c\u901a\u3063\u305f\u3082\u306e\u306b\u306a\u3063\u3066\u3057\u307e\u3046\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/p>\n

\"\"<\/p>\n

-200dB\u307e\u3067\u8868\u793a\u3067\u304d\u308b\u3068\u3088\u304b\u3063\u305f\u306e\u3067\u3059\u304c\u30fb\u30fb\u30fb\u3002<\/p>\n

\"\"<\/p>\n

\u4e0a\u306e\u30c1\u30e3\u30fc\u30c8\u306f\u5165\u529b\u306e\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u5468\u6ce2\u6570\u304c44.1kHz\u306e\u5834\u5408\u306e\u7279\u6027\u3092\u793a\u3057\u305f\u3082\u306e\u3067\u3059\u3002(\u5165\u529b\u4fe1\u53f7\u306e\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u5468\u6ce2\u6570\u304c2\u500d\u30014\u500d\u306e\u5834\u5408\u306b\u3082\u6a2a\u8ef8\u306f\u500d\u3005\u3067\u5168\u304f\u540c\u3058\u7279\u6027\u3092\u793a\u3057\u307e\u3059)<\/p>\n

\u901a\u5e38\u3001IC\u3067\u30c7\u30b8\u30bf\u30eb\u30d5\u30a3\u30eb\u30bf\u3092\u69cb\u6210\u3059\u308b\u5834\u5408\u3001\u30c1\u30c3\u30d7\u306e\u30c0\u30a4\u9762\u7a4d\u3092\u6975\u9650\u307e\u3067\u7bc0\u7d04\u3059\u308b\u3053\u3068\u3092\u4f1a\u793e\u306e\u4e0a\u5c64\u90e8\u304b\u3089\u8981\u6c42\u3055\u308c\u308b\u306e\u304c\u666e\u901a\u3067 ( \u5bfe\u8c61\u306f\u30c7\u30b8\u30bf\u30eb\u30d5\u30a3\u30eb\u30bf\u306b\u9650\u308a\u307e\u305b\u3093\u304c\u3001\u30b3\u30b9\u30c8\u304c\u4e0a\u304c\u3089\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u305f\u3081\u3067\u3059 )\u3001\u5927\u62b5\u306eIC\u8a2d\u8a08\u8005\u306f\u9a5a\u304f\u307b\u3069\u5c11\u306a\u3044RAM\/ROM\/\u30ed\u30b8\u30c3\u30af\u6570\u3057\u304b\u8a31\u3055\u308c\u306a\u3044\u3068\u3044\u3046\u5927\u304d\u306a\u5236\u7d04\u306e\u4e2d\u3067\u4f5c\u308a\u8fbc\u307e\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002<\/p>\n

\u5927\u5bb9\u91cfFPGA\u3067\u69cb\u6210\u3059\u308b\u5834\u5408\u306b\u306f\u3001\u56de\u8def\u30ea\u30bd\u30fc\u30b9\u306f\u300e\u3042\u308b\u3060\u3051\u306e\u5206\u300f\u306f\u5168\u90e8\u4f7f\u3063\u3066\u826f\u3044\u308f\u3051\u3067\u3059\u304b\u3089\u5272\u3068\u878d\u901a\u304c\u5229\u304d\u307e\u3059\u3002\u305d\u3046\u3044\u3046\u308f\u3051\u3067\u3001\u3053\u306e\u30d5\u30a3\u30eb\u30bf\u306b\u95a2\u3057\u3066\u306f\u304b\u306a\u308a\u512a\u79c0\u306a\u906e\u65ad\u7279\u6027\u306b\u306a\u3063\u3066\u3044\u308b\u3068\u8003\u3048\u3066\u3044\u307e\u3059\u3002<\/p>\n

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\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"

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