{"id":1105,"date":"2015-06-06T12:51:22","date_gmt":"2015-06-06T03:51:22","guid":{"rendered":"http:\/\/fpga.cool.coocan.jp\/wordpress\/?p=1105"},"modified":"2015-06-06T14:17:15","modified_gmt":"2015-06-06T05:17:15","slug":"%e7%9b%ae%e5%87%a6%e3%81%8c%e7%ab%8b%e3%81%a4","status":"publish","type":"post","link":"http:\/\/fpga.cool.coocan.jp\/wordpress\/?p=1105","title":{"rendered":"\u76ee\u51e6\u304c\u7acb\u3064"},"content":{"rendered":"

\u524d\u56de\u4e88\u60f3\u3057\u305f\u3068\u304a\u308a\u3001\u3053\u306eI2S\u30b3\u30f3\u30c8\u30ed\u30fc\u30e9\u306b\u5165\u529b\u3059\u308b\u30aa\u30fc\u30c7\u30a3\u30aa\u7cfb\u30af\u30ed\u30c3\u30af\u309212.288MHz\u304b\u3089\u500d\u306e24.576MHz\u306b\u5909\u66f4\u3059\u308b\u3060\u3051\u3067\u3001\u3064\u307e\u308aZYNQ\u30d7\u30ed\u30bb\u30c3\u30b5\u306e\u30da\u30ea\u30d5\u30a7\u30e9\u30eb\u30fb\u30af\u30ed\u30c3\u30af\u306ePLL\u30b3\u30f3\u30d5\u30a3\u30ae\u30e5\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u5909\u3048\u308b\u3060\u3051\u3067\u3001I2S\u30b3\u30f3\u30c8\u30ed\u30fc\u30e9\u306e\u56de\u8def\u3084\u30c7\u30d0\u30a4\u30b9\u30fb\u30c9\u30e9\u30a4\u30d0\u3092\u5909\u66f4\u3059\u308b\u3053\u3068\u306a\u304f\u3001192kHz\u307e\u3067\u306e\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u5468\u6ce2\u6570\u306b\u5bfe\u5fdc\u3067\u304d\u308b\u3053\u3068\u304c\u52d5\u4f5c\u78ba\u8a8d\u3067\u304d\u307e\u3057\u305f\u3002<\/p>\n

\u6c17\u3092\u826f\u304f\u3057\u3066\u3001\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u5468\u6ce2\u6570\u304c48kHz\u306e\u500d\u6570 (\u3042\u308b\u3044\u306f\u3084\u308d\u3046\u3068\u601d\u3048\u307044.1kHz\u306e\u500d\u6570) \u306b\u3057\u304b\u5bfe\u5fdc\u3067\u304d\u306a\u3044\u3068\u3044\u3046\u73fe\u884c\u306e\u88c5\u7f6e\u306e\u9650\u754c\u3092\u7834\u308b\u3079\u304f\u3001\u518d\u751f\u30aa\u30fc\u30c7\u30a3\u30aa\u30d5\u30a1\u30a4\u30eb\u306e\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u5468\u6ce2\u6570\u306b\u5fdc\u3058\u3066\u3001\u3053\u306e\u30b7\u30b9\u30c6\u30e0\u30af\u30ed\u30c3\u30af\u306e\u5468\u6ce2\u6570\u3092\u30012\u3064\u306e\u30af\u30ea\u30b9\u30bf\u30eb\u767a\u632f\u5668\u300124.576MHz\u304b22.5792MHz\u306e\u3044\u305a\u308c\u304b\u3092\u5207\u308a\u66ff\u3048\u3066\u4f9b\u7d66\u3067\u304d\u308b\u3088\u3046\u306bI2S\u30b3\u30f3\u30c8\u30ed\u30fc\u30e9\u3068\u3001\u305d\u306e\u30c7\u30d0\u30a4\u30b9\u30fb\u30c9\u30e9\u30a4\u30d0\u3092\u6539\u9020\u3057\u3066\u307f\u307e\u3057\u305f\u3002<\/p>\n

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\u30af\u30ea\u30b9\u30bf\u30eb\u767a\u632f\u5668\u306fDAC\u304c\u8f09\u3063\u305f\u57fa\u677f\u4e0a\u306b2\u500b\u7f6e\u304b\u308c\u308b\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002\u9078\u629e\u3055\u308c\u305f\u30af\u30ed\u30c3\u30af\u304cDAC IC\u3068ZYBO\u306b\u4f9b\u7d66\u3055\u308c\u307e\u3059\u3002<\/p>\n

DAC IC\u3068\u3057\u3066PCM1792A\u3092\u8f09\u305b\u307e\u3057\u305f\u306e\u3067\u3001CPU(ARM)\u304b\u3089\u8a2d\u5b9a\u304c\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308b (\u3059\u308b) \u4e88\u5b9a\u3067\u3059\u3002Linux\u306b\u306fPCM1792A\u306e\u30c7\u30d0\u30a4\u30b9\u30fb\u30c9\u30e9\u30a4\u30d0\u3082\u5165\u3063\u3066\u3044\u307e\u3059\u306e\u3067\u3001\u3053\u3061\u3089\u3082\u6539\u9020\u3057\u3066\u4f7f\u3046\u3053\u3068\u306b\u306a\u308b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n

\u6539\u9020\u304c\u5fc5\u8981\u306b\u306a\u308b\u7406\u7531\u306fDSD\u5bfe\u5fdc\u3067\u3059\u3002\u4eca\u56de\u306e\u691c\u8a0e\u3067\u3001I2S\u30b3\u30f3\u30c8\u30ed\u30fc\u30e9\u306bDSD\u5bfe\u5fdc\u306e\u6a5f\u80fd\u3092\u8ffd\u52a0\u3059\u308c\u3070\u666e\u901a\u306bNative DSD\u518d\u751f\u304c\u3067\u304d\u308b\u306f\u305a\u3067\u3042\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u307e\u3057\u305f\u3002<\/p>\n

\u6700\u8fd1\u306eALSA\u30e9\u30a4\u30d6\u30e9\u30ea\u306b\u306f\u3001”SND_PCM_FORMAT_DSD_U32_LE” \u3068\u3044\u3046\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u304c\u8ffd\u52a0\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u8abf\u3079\u3066\u307f\u308b\u3068\u3001\u5143\u6765\u3001\u4e00\u90e8\u306eUSB\u30aa\u30fc\u30c7\u30a3\u30aa\u57fa\u677f\u5411\u3051\u306b\u65b0\u305f\u306b\u7528\u610f\u3055\u308c\u305f\u62e1\u5f35\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e\u3088\u3046\u3067\u3059\u304c\u3001\u81ea\u4f5c\u306eALSA\u30a2\u30d7\u30ea\u304b\u3089ARM\u306eAXI\u30d0\u30b9\u306b\u3076\u3089\u4e0b\u304c\u308b\u5f62\u306e\u3053\u306eI2S\u30b3\u30f3\u30c8\u30ed\u30fc\u30e9\u306b\u5bfe\u3057\u3066\u3082\u3001\u518d\u751f\u6642\u306b\u30c7\u30d0\u30a4\u30b9\u30fb\u30c9\u30e9\u30a4\u30d0\u7d4c\u7531\u3067\u3053\u306e\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u60c5\u5831\u3092\u4f1d\u3048\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3042\u308b\u3068\u5b9f\u9a13\u3067\u78ba\u8a8d\u3057\u307e\u3057\u305f\u3002<\/p>\n

\u3064\u307e\u308a\u3001\u30a2\u30d7\u30ea\u304c\u518d\u751f\u958b\u59cb\u3059\u308b\u76f4\u524d\u306b\u3001\u518d\u751f\u4fe1\u53f7\u306e\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u60c5\u5831 \u3068\u3057\u3066 “SND_PCM_FORMAT_S32_LE” \u3092\u9001\u3063\u3066\u304f\u308c\u3070I2S\u30e2\u30fc\u30c9\u306b\u3001”SND_PCM_FORMAT_DSD_U32_LE” \u3092\u9001\u3063\u3066\u304f\u308c\u3070DSD\u30e2\u30fc\u30c9\u3078\u3068\u3001I2S\u30b3\u30f3\u30c8\u30ed\u30fc\u30e9\u306e\u6a5f\u80fd\u304c\u5207\u308a\u66ff\u308f\u308b\u3088\u3046\u306bI2S\u30b3\u30f3\u30c8\u30ed\u30fc\u30e9\u306e\u30ed\u30b8\u30c3\u30af\u56de\u8def\u3068\u30c7\u30d0\u30a4\u30b9\u30fb\u30c9\u30e9\u30a4\u30d0\u3092\u4f5c\u308a\u3053\u3093\u3067\u304a\u3051\u3070\u826f\u3044\u3068\u3044\u3046\u308f\u3051\u3067\u3059\u3002<\/p>\n

\u304a\u305d\u3089\u304f\u306f\u3001\u6700\u8fd1\u306eMPD\u3067\u306f\u3053\u306e\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3001”SND_PCM_FORMAT_DSD_U32_LE” \u304c\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u3066\u3044\u308b\u306f\u305a\u3067\u3059\u306e\u3067\u3001ZYBO\u306b\u3082\u7d44\u307f\u8fbc\u3093\u3067\u3042\u3052\u308b\u3053\u3068\u3067\u3001\u51fa\u529b\u5bfe\u8c61\u304cUSB\u30a2\u30c0\u30d7\u30bf\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u304c\u3001Native DSD\u518d\u751f\u304c\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308b\u3082\u306e\u3068\u601d\u308f\u308c\u307e\u3059\u3002<\/p>\n

\u3061\u306a\u307f\u306b\u3067\u3059\u304c\u3001ZYNQ\u30d7\u30ed\u30bb\u30c3\u30b5\u306e\u30d9\u30f3\u30c0\u3067\u3042\u308bxilinx\u3084\u3001\u3042\u308b\u3044\u306fZYBO\u57fa\u677f\u3092\u30ea\u30ea\u30fc\u30b9\u3057\u3066\u3044\u308bDigilent\u304c\u516c\u958b\u3057\u3066\u3044\u308bramdisk\u306b\u306fALSA\u306e\u30e9\u30a4\u30d6\u30e9\u30ea\u306f\u7d44\u307f\u8fbc\u307e\u308c\u3066\u3044\u307e\u305b\u3093\u306e\u3067\u3001\u81ea\u5206\u3067\u6700\u65b0\u7248\u306e\u30bd\u30fc\u30b9\u3092\u5f15\u3063\u5f35\u3063\u3066\u304d\u3066\u3001\u30ce\u30fc\u30c8PC\u306b\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u305fLinux\u4e0a\u3067\u30af\u30ed\u30b9\u30fb\u30b3\u30f3\u30d1\u30a4\u30eb\u3057\u3066\u7a81\u3063\u8fbc\u307f\u307e\u3057\u305f\u3002<\/p>\n

ALSA\u30a2\u30d7\u30ea\u306b\u3057\u3066\u3082\u3001\u30c7\u30d0\u30a4\u30b9\u30fb\u30c9\u30e9\u30a4\u30d0\u306b\u3057\u3066\u3082\u3001\u3082\u3061\u308d\u3093OS\u672c\u4f53\u306e\u30ab\u30fc\u30cd\u30eb\u306b\u3057\u3066\u3082\u3001\u3059\u3079\u3066\u30af\u30ed\u30b9\u30fb\u30b3\u30f3\u30d1\u30a4\u30eb\u3068\u3044\u3046\u3053\u3068\u306b\u306a\u3063\u3066\u3057\u307e\u3046\u306e\u306f\u540c\u3058\u3067\u3059\u304c\u30fb\u30fb\u30fb\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

\u524d\u56de\u4e88\u60f3\u3057\u305f\u3068\u304a\u308a\u3001\u3053\u306eI2S\u30b3\u30f3\u30c8\u30ed\u30fc\u30e9\u306b\u5165\u529b\u3059\u308b\u30aa\u30fc\u30c7\u30a3\u30aa\u7cfb\u30af\u30ed\u30c3\u30af\u309212.288MHz\u304b\u3089\u500d\u306e24.576MHz\u306b\u5909\u66f4\u3059\u308b\u3060\u3051\u3067\u3001\u3064\u307e\u308aZYNQ\u30d7\u30ed\u30bb\u30c3\u30b5\u306e\u30da\u30ea\u30d5\u30a7\u30e9\u30eb\u30fb\u30af\u30ed\u30c3\u30af\u306ePLL\u30b3\u30f3\u30d5\u30a3\u30ae\u30e5\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u5909\u3048 … “\u76ee\u51e6\u304c\u7acb\u3064” \u306e<\/span>\u7d9a\u304d\u3092\u8aad\u3080<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1105","post","type-post","status-publish","format-standard","hentry","category-1"],"_links":{"self":[{"href":"http:\/\/fpga.cool.coocan.jp\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/1105","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/fpga.cool.coocan.jp\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/fpga.cool.coocan.jp\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/fpga.cool.coocan.jp\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/fpga.cool.coocan.jp\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1105"}],"version-history":[{"count":22,"href":"http:\/\/fpga.cool.coocan.jp\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/1105\/revisions"}],"predecessor-version":[{"id":1127,"href":"http:\/\/fpga.cool.coocan.jp\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/1105\/revisions\/1127"}],"wp:attachment":[{"href":"http:\/\/fpga.cool.coocan.jp\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1105"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/fpga.cool.coocan.jp\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1105"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/fpga.cool.coocan.jp\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1105"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}