{"id":4667,"date":"2015-11-15T00:46:19","date_gmt":"2015-11-14T15:46:19","guid":{"rendered":"https:\/\/y2tech.net\/blog\/?p=4667"},"modified":"2017-06-03T20:25:46","modified_gmt":"2017-06-03T11:25:46","slug":"network-audio-with-raspberry-pi-2-vol-6","status":"publish","type":"post","link":"https:\/\/y2tech.net\/blog\/d-i-y\/network-audio-with-raspberry-pi-2-vol-6-4667\/","title":{"rendered":"Raspberry Pi 2 + Volumio + DAC \u3067\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30aa\u30fc\u30c7\u30a3\u30aa\u306b\u6311\u6226\uff08\u305d\u306e\uff16\uff09"},"content":{"rendered":"

Raspberry Pi 2 \u3092\u81ea\u4f5cDAC\u30b7\u30b9\u30c6\u30e0\u306b\u7d44\u307f\u8fbc\u3093\u3067\u307f\u305f<\/h3>\r\n
\r\n
\r\n
\r\n\"Raspberry \r\n
\r\n\u4ee5\u524d\u4f5c\u6210\u3057\u305f\u81ea\u4f5cDAC\u30b7\u30b9\u30c6\u30e0\u306b\u7121\u7406\u77e2\u7406Raspberry Pi 2 \u3092\u7d44\u307f\u8fbc\u3093\u3067\u5b9f\u9a13\u3057\u3066\u3044\u308b\u69d8\u5b50<\/span>\r\n<\/div>\r\n
\r\n
\r\n

\u3053\u308c\u307e\u3067Raspberry Pi 2\u3068Volumio\u306e\u7d44\u307f\u5408\u308f\u305b\u3067\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30aa\u30fc\u30c7\u30a3\u30aa\u30d7\u30ec\u30a4\u30e4\u30fc\u3092\u5b9f\u73fe\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u7c21\u5358\u306b\u8aac\u660e\u3057\u3066\u304d\u305f\u304c\u3001\u7d44\u307f\u5408\u308f\u305b\u308bDAC\u30e2\u30b8\u30e5\u30fc\u30eb\u306fTI\u306ePCM5102\u3084ESS Technology \u306eES9023\u306a\u3069\u306e\u6bd4\u8f03\u7684\u5b89\u4fa1\u3067\u7c21\u6613\u7684\u306aDAC\u30c1\u30c3\u30d7\u306e\u7d44\u307f\u5408\u308f\u305b\u3060\u3051\u3060\u3063\u305f\u306e\u3067\u3001\u672c\u683c\u7684\u306a\u30aa\u30fc\u30c7\u30a3\u30aa\u7528\u9014\u3068\u3057\u3066\u306f\u5c11\u3057\u7269\u8db3\u308a\u306a\u3044\u3068\u3044\u3046\u611f\u3058\u304c\u3059\u308b\uff0e<\/p>\r\n
\r\n

\u52ff\u8ad6\u3001\u3053\u308c\u3089\u306e\u7d44\u307f\u5408\u308f\u305b\u3067\u3082\u5341\u5206\u9ad8\u54c1\u8cea\u306a\u30c7\u30a3\u30b8\u30bf\u30eb\u30aa\u30fc\u30c7\u30a3\u30aa\u30b7\u30b9\u30c6\u30e0\u3068\u8a00\u3048\u308b\u306e\u3060\u304c\u3001\u3084\u306f\u308a\u3082\u3046\u5c11\u3057\u4e0a\u4f4d\u306eDAC\u30b7\u30b9\u30c6\u30e0\u3068\u7d44\u307f\u5408\u308f\u305b\u3066\u898b\u305f\u3044\u3068\u601d\u3046\uff0e\u305d\u3053\u3067\u3001\u4eca\u56de\u306f\u4ee5\u524d\u88fd\u4f5c\u3057\u305f\u30c7\u30b8\u30c3\u30c8\u306e\u30c7\u30b8\u30bf\u30eb\u30aa\u30fc\u30c7\u30a3\u30aa\u30ad\u30c3\u30c8\u30b7\u30b9\u30c6\u30e0\u306b\u7121\u7406\u77e2\u7406Raspberry Pi 2\u3092\u7d44\u307f\u8fbc\u3093\u3067\u307f\u305f\uff0e<\/p>\r\n
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Raspberry Pi 2\u3068Volumio\u306e\u7d44\u307f\u5408\u308f\u305b\u3067\u554f\u984c\u3068\u306a\u308b\u306e\u306f\u3001Raspberry Pi 2\u304b\u3089\u51fa\u529b\u3055\u308c\u308bI2S\u4fe1\u53f7\u304c\u3001LRCK, BCK, DATA \u3057\u304b\u306a\u304f\u3001MCK\u4fe1\u53f7\u304c\u51fa\u529b\u3055\u308c\u306a\u3044\u3053\u3068\u3060\uff0ePCM5102\u3084ES9023\u306a\u3069\u306fDAC\u30c1\u30c3\u30d7\u5185\u90e8\u3067BCK\u4fe1\u53f7\u306a\u3069\u304b\u3089MCK\u4fe1\u53f7\u3092\u5185\u90e8\u3067\u751f\u6210\u3059\u308b\u6a5f\u80fd\u3092\u6301\u3063\u3066\u3044\u308b\u306e\u3067\u3001MCK\u4fe1\u53f7\u304c\u7121\u304f\u3066\u3082\u4e0a\u8a18\u306e3\u3064\u306e\u5165\u529b\u4fe1\u53f7\u3060\u3051\u3067\u304d\u3061\u3093\u3068\u518d\u751f\u304c\u3067\u304d\u308b\u306e\u3067\u7279\u306b\u554f\u984c\u306b\u306f\u306a\u3089\u306a\u3044\uff0e<\/p>\r\n
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MCK\u4fe1\u53f7\u304c\u5fc5\u9808\u306eDAC\u30c1\u30c3\u30d7\u3092Raspberry Pi 2\u3068Volumio\u306e\u7d44\u307f\u5408\u308f\u305b\u3067\u4f7f\u3046\u5834\u5408\u306b\u306f\u3001\u4f55\u3089\u304b\u306e\u65b9\u6cd5\u3067 MCK\u4fe1\u53f7\u3092\u4f5c\u308a\u51fa\u3055\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\uff0eMCK\u4fe1\u53f7\u3092\u751f\u6210\u3055\u305b\u308b\u65b9\u6cd5\u3068\u3057\u3066\u3001
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\r\n
\r\n\u30fbVolumio\u306b\u7d44\u307f\u8fbc\u307e\u308c\u3066\u3044\u308b\u3001I2S\u30b5\u30a6\u30f3\u30c9\u30c9\u30e9\u30a4\u30d0\u30fc\u30e2\u30b8\u30e5\u30fc\u30eb\u3092\u306b\u624b\u3092\u52a0\u3048\u3066\u3001Raspberry Pi 2 \u306eGPIO\u30d4\u30f3\u304b\u3089MCK\u306b\u76f8\u5f53\u3059\u308b\u4fe1\u53f7\u3092\u51fa\u529b\u3055\u305b\u308b\uff0e\r\n
\r\n
\r\n\u3000\u3053\u306e\u65b9\u6cd5\u306f\u3001Linux\u306e\u30c9\u30e9\u30a4\u30d0\u30fc\u306e\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u3092\u5f04\u3063\u3066\u518d\u30b3\u30f3\u30d1\u30a4\u30eb\u3059\u308b\u306a\u3069\u306e\u9ad8\u5ea6\u306a\u6280\u80fd\u304c\u5fc5\u8981\u306b\u306a\u308b\u306e\u3067\u3001\u4e00\u822c\u306e\u4eba\u3067\u306f\u5168\u304f\u592a\u5200\u6253\u3061\u3067\u304d\u306a\u3044\u304c\u3001\u307b\u30fc\u308a\u30fc\u3055\u3093\u304cMCLK\u51fa\u529b\u5bfe\u5fdc\u306eVolumio\u306e\u30a4\u30e1\u30fc\u30b8\u3092\u914d\u5e03\u3057\u3066\u3044\u308b\u3088\u3046\u306a\u306e\u3067\u3001\u8208\u5473\u306e\u5728\u308b\u4eba\u306f\u4e0b\u8a18\u306e\u30da\u30fc\u30b8\u3092\u8997\u3044\u3066\u307f\u3066\u6b32\u3057\u3044\uff0e\r\n
\r\n
\r\n\u3000\u300eMCLK\u51fa\u529b\u5bfe\u5fdcVolumio1.55<\/a>\u300f\uff1a\u3000\u307b\u30fc\u308a\u30fc\u3055\u3093\u306e\u65e5\u8a18\u3000\r\n
\r\n
\r\n\u30fbBCK\u4fe1\u53f7\u304b\u3089ICS570\u7b49\u306e\u30de\u30eb\u30c1\u30d7\u30e9\u30a4\u30e4\u30fcIC\u30c1\u30c3\u30d7\u3092\u4f7f\u3063\u3066\u3001BCK\u4fe1\u53f7\u306e\u6574\u6570\u500d\u306eMCK\u4fe1\u53f7\u3092\u751f\u6210\u3059\u308b\uff0e\r\n
\r\n
\r\n\u3000\u3053\u306e\u65b9\u6cd5\u3082\u3001\u81ea\u5206\u3067\u56de\u8def\u3092\u4f5c\u6210\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u306e\u3067\u4e00\u822c\u5411\u3051\u3068\u306f\u8a00\u3048\u306a\u3044\u304c\u3001\u96fb\u5b50\u5de5\u4f5c\u304c\u5f97\u610f\u306a\u4eba\u3067\u3042\u308c\u3070\u305d\u308c\u7a0b\u96e3\u3057\u3044\u4e8b\u306f\u306a\u3044\u3060\u308d\u3046\uff0eICS570\u306b\u95a2\u3057\u3066\u306f\u3061\u3087\u3063\u3068\u524d\u306bDigi-Key\u304b\u3089\u8cfc\u5165\u3057\u3066\u3042\u308b\u306e\u3067\u3001\u6642\u9593\u304c\u3067\u304d\u305f\u3089ICS570\u3092\u7528\u3044\u305fMCK\u4fe1\u53f7\u751f\u6210\u56de\u8def\u3092\u7d44\u307f\u8fbc\u3093\u3067\u307f\u308b\u3064\u3082\u308a\u3060\uff0e\r\n
\r\n
\r\n\u3000ICS570\u306e\u30c7\u30fc\u30bf\u30b7\u30fc\u30c8\uff1a https:\/\/www.idt.com\/document\/dst\/570-datasheet<\/a>\r\n
\r\n
\r\n\u30fbASRC(Asynchronous Sampling Rate Converter:\u975e\u540c\u671f\u578b\u30b5\u30f3\u30d7\u30eb \u30ec\u30fc\u30c8 \u30b3\u30f3\u30d0\u30fc\u30bf\u30fc)\u3092\u7528\u3044\u308b\u65b9\u6cd5\r\n
\r\n
\r\n\u3000\u4eca\u56de\u306f\u3001\u3053\u306eASRC\u3092\u7528\u3044\u3066MCK\u4fe1\u53f7\u306e\u7121\u3044Raspberry Pi 2\u3068Volumio\u306e\u7d44\u307f\u5408\u308f\u305b\u3067\u3082DAC\u30c1\u30c3\u30d7\u304c\u6b63\u5e38\u306b\u6a5f\u80fd\u3059\u308b\u3088\u3046\u306b\u30b7\u30b9\u30c6\u30e0\u3092\u7d44\u3093\u3067\u307f\u308b\u3053\u3068\u306b\u3059\u308b\uff0e\u3068\u306f\u8a00\u3063\u3066\u3082\u3001\u65e2\u306bASRC\u30e2\u30b8\u30e5\u30fc\u30eb\u81ea\u4f53\u306f\u81ea\u4f5cDAC\u30b7\u30b9\u30c6\u30e0\u306b\u7d44\u307f\u8fbc\u307e\u308c\u3066\u3044\u308b\u306e\u3067\u3001\u4eca\u56de\u306f\u5358\u7d14\u306bRaspberry Pi 2\u306eLRCK, BCK, DATA\u4fe1\u53f7\u3092\u65e2\u5b58\u306eASRC\u30e2\u30b8\u30e5\u30fc\u30eb\u306b\u7a81\u3063\u8fbc\u3080\u3060\u3051\u306e\u8a71\u3060\uff0e<\/p>\r\n
\r\n

\r\n\"ASRC\r\n
\r\n\u4eca\u56de\u306f\u30c7\u30b8\u30c3\u30c8\uff08\u5171\u7acb\u96fb\u5b50\uff09\u306e\u30ad\u30c3\u30c8\u3092\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u3057\u305f\u30e2\u30b8\u30e5\u30fc\u30eb\u3092\u4f7f\u7528\u3057\u305f<\/span>\r\n<\/div>\r\n
\r\n
\r\n

Raspberry Pi 2\u306e\u4e0a\u306b\u306f\u30c9\u30fc\u30bf\u30fc\u30ab\u30fc\u30c9\u3092\u8f09\u305b\u3001\u30c7\u30b8\u30bf\u30eb\u30a2\u30a4\u30bd\u30ec\u30fc\u30bf\uff08TI ISO7640\uff09\u306b\u3088\u308aI2S\u4fe1\u53f7\u3092\u7d76\u7e01\u3057\u3066\u3001Raspberry Pi\u5074\u306e\u30ce\u30a4\u30ba\u306e\u5f71\u97ff\u304cASRC\u3084DAC\u5074\u306b\u4f1d\u308f\u3089\u306a\u3044\u3088\u3046\u306b\u3057\u3066\u3042\u308b\uff0e\u30c7\u30b8\u30bf\u30eb\u30a2\u30a4\u30bd\u30ec\u30fc\u30bf\u3092\u4ef2\u4ecb\u3057\u3066\u3042\u308b\u306e\u3067\u3001Raspberry Pi\u5074\u306e\u96fb\u6e90\u306e\u8cea\u306e\u60aa\u304c\u60aa\u5f71\u97ff\u3092\u53ca\u307c\u3059\u53ef\u80fd\u6027\u306f\u5c11\u306a\u3044\u3068\u306f\u601d\u3046\u304c\u3001Raspberry Pi B+ \u30e2\u30c7\u30eb\u4ee5\u964d\u3067\u5c0e\u5165\u3055\u308c\u305f\u5185\u8535\u306e\u30b9\u30a4\u30c3\u30c1\u30f3\u30b0\u30ec\u30ae\u30e5\u30ec\u30fc\u30bf\u305d\u306e\u3082\u306e\u3092\u53d6\u308a\u6255\u3063\u3066\u3001Raspberry Pi\u305d\u306e\u3082\u306e\u3092\u30ed\u30fc\u30ce\u30a4\u30ba\u5316\uff08\u5b9f\u969b\u306e\u52b9\u679c\u306f\u4e0d\u660e\uff1f\u3000\u591a\u5206\u6c17\u4f11\u3081\u7a0b\u5ea6\u306b\u3057\u304b\u306a\u3063\u3066\u3044\u306a\u3044\uff1f\uff1f\uff1f\uff09\u3057\u305f\uff0e\u52ff\u8ad6\u3001Raspberry Pi \u306e\u96fb\u6e90\u306f\u5c02\u7528\u306e\u96fb\u6e90\u30c8\u30e9\u30f3\u30b9\u3068\u96fb\u6e90\u56de\u8def\u3092\u4f7f\u7528\u3057\u3001ASRC\u3084DAC\u306e\u96fb\u6e90\u7cfb\u7d71\u3068\u306f\u5b8c\u5168\u306b\u30c8\u30e9\u30f3\u30b9\u30ec\u30d9\u30eb\u3067\u5206\u96e2\u3057\u3066\u3044\u308b\uff08\u3053\u306e\u5f8c\u306e\u7d9a\u7de8\u3067\u7d39\u4ecb\u4e88\u5b9a\uff09<\/p>\r\n
\r\n
\r\n

ASRC\u306b\u3064\u3044\u3066<\/h4>\r\n
\r\n

ASRC\uff08\u975e\u540c\u671f\u578b\u30b5\u30f3\u30d7\u30eb\u30ec\u30fc\u30c8\u30b3\u30f3\u30d0\u30fc\u30bf\u30fc\uff09\u3068\u805e\u3044\u3066\u3082\u30c7\u30a3\u30b8\u30bf\u30eb\u30aa\u30fc\u30c7\u30a3\u30aa\u306b\u8a73\u3057\u3044\u4eba\u3067\u306a\u3051\u308c\u3070\u3069\u306e\u3088\u3046\u306a\u7269\u306a\u306e\u304b\u60f3\u50cf\u304c\u3064\u304b\u306a\u3044\u304b\u3082\u3057\u308c\u306a\u3044\u304c\u3001\u30c7\u30b8\u30bf\u30eb\u30aa\u30fc\u30c7\u30a3\u30aa\u4fe1\u53f7\u3092\u53d7\u3051\u6e21\u3057\u3059\u308b\u969b\u306b\u3001\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u5468\u6ce2\u6570\u3084\u91cf\u5b50\u5316\u30d3\u30c3\u30c8\u6570\u306a\u3069\u3092\u5909\u63db\u3059\u308b\u30e2\u30b8\u30e5\u30fc\u30eb\u306e\u4e8b\u3060\uff0e\u672c\u6765\u306f\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u5468\u6ce2\u6570\u306e\u5909\u63db\u6a5f\u80fd\u306e\u4e8b\u3060\u304c\u3001\u30c7\u30b8\u30bf\u30eb\u30aa\u30fc\u30c7\u30a3\u30aa\u4fe1\u53f7\u3092\u6271\u3046\u5834\u5408\u306b\u306f\u91cf\u5b50\u5316\u30ec\u30d9\u30eb\u306e\u5909\u63db\u3082\u540c\u6642\u306b\u884c\u308f\u308c\u308b\u4e8b\u304c\u591a\u3044\u306e\u3067\u3001\u30c7\u30b8\u30bf\u30eb\u30aa\u30fc\u30c7\u30a3\u30aa\u4fe1\u53f7\u7528\u306eASRC\u30c1\u30c3\u30d7\u306f\u4e21\u65b9\u306e\u6a5f\u80fd\u304c\u5099\u308f\u3063\u3066\u3044\u308b\uff0e<\/p>\r\n
\r\n

\u4eca\u56de\u7528\u3044\u305fASRC\u30c1\u30c3\u30d7\u306f\u3001TI\u306eSRC4192\u3068\u3044\u3046\u578b\u756a\u306e\u7269\u3067\u3001\u30c7\u30b8\u30bf\u30eb\u30aa\u30fc\u30c7\u30a3\u30aa\u5165\u529b\u4fe1\u53f7\u306e\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u5468\u6ce2\u6570\u3092\u6700\u592716\u500d\u307e\u3067\u4e0a\u3052\u305f\u308a\uff08\u30a2\u30c3\u30d7\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\uff09\u30011\/16\u307e\u3067\u4e0b\u3052\u305f\u308a\uff08\u30c0\u30a6\u30f3\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\uff09\u3059\u308b\u4e8b\u304c\u3067\u304d\u308b\uff0e\u3053\u306e\u30c1\u30c3\u30d7\u81ea\u4f53\u306f\u6700\u65b0\u306e\u8a2d\u8a08\u3067\u306f\u306a\u3044\u306e\u3067\u3001\u6271\u3048\u308b\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u5468\u6ce2\u6570\u304c\u6700\u5927\u3067212KHz\u307e\u3067\u3068\u3044\u3046\u5236\u9650\u304c\u3042\u308a\u3001\u6700\u65b0\u306e384KHz\u3084768KHz\u307e\u3067\u6271\u3046\u4e8b\u306e\u3067\u304d\u308bDAC\u3068\u306e\u7d44\u307f\u5408\u308f\u305b\u3067\u306f\u3061\u3087\u3063\u3068\u7269\u8db3\u308a\u306a\u3044\u304c\u3001192KHz\/24bit \u306b\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u306e\u3067PCM1792\/1794\u306a\u3069\u3068\u306e\u7d44\u5408\u308f\u305b\u3067\u306f\u30b8\u30e3\u30b9\u30c8\u30d5\u30a3\u30c3\u30c8\u3060\u308d\u3046\uff0e<\/p>\r\n
\r\n
\r\n\u3000TI\u306eSRC4192\u306e\u7d39\u4ecb\u30da\u30fc\u30b8\uff08\u4e00\u5fdc\u65e5\u672c\u8a9e\uff09\uff1a http:\/\/www.tij.co.jp\/product\/jp\/src4192<\/a>\r\n
\r\n
\r\n

\u4eca\u56de\u4f7f\u7528\u3057\u305fASRC\u30e2\u30b8\u30e5\u30fc\u30eb\u306f\u3001\u30c7\u30b8\u30c3\u30c8\u306e\u300e\u30b5\u30f3\u30d7\u30eb\u30ec\u30fc\u30c8\u30b3\u30f3\u30d0\u30fc\u30bf\u5b9f\u9a13\u57fa\u677f<\/a>\u300f\u306b\u3061\u3087\u3063\u3068\u624b\u3092\u52a0\u3048\u305f\u7269\u3092\u5229\u7528\u3057\u305f\uff0eSRC4192\u306e\u6a5f\u80fd\u3092\u7406\u89e3\u3057\u4f7f\u3044\u3053\u306a\u3059\u306e\u306f\u7d50\u69cb\u5927\u5909\u3067\u3001\u30b5\u30f3\u30d7\u30eb\u30ec\u30fc\u30c8\u30b3\u30f3\u30d0\u30fc\u30bf\u5b9f\u9a13\u57fa\u677f\u306e\u8aac\u660e\u66f8\u3092\u4e00\u901a\u308a\u8aad\u3093\u3060\u3060\u3051\u3067\u306f\u4f7f\u3044\u65b9\u3092\u7406\u89e3\u3067\u304d\u306a\u304b\u3063\u305f\u304c\u3001\u8272\u3005\u3068\u5b9f\u9a13\u3092\u7e70\u308a\u8fd4\u3057\u3066\u3044\u308b\u3046\u3061\u306b\u4f55\u3068\u306a\u304f\u4f7f\u3044\u65b9\u3084\u6a5f\u80fd\u304c\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u3063\u305f\uff0e<\/p>\r\n
\r\n

SRC4192\u3092\u7528\u3044\u3066\u300144.1KHz\/16bit\u306eCD\u30ec\u30d9\u30eb\u306e\u4fe1\u53f7\u3092\u3001192KHz\/24bit \u306e\u6240\u8b02\u30cf\u30a4\u30ec\u30be\u4ed5\u69d8\u306b\u5909\u63db\u3059\u308b\u305f\u3081\u306b\u306f\u304b\u306a\u308a\u9762\u5012\u306a\u8a2d\u5b9a\u304c\u5fc5\u8981\u3067\u3001\u52d5\u4f5c\u30e2\u30fc\u30c9\u8a2d\u5b9a\uff08\u30b9\u30ec\u30fc\u30d6\u30e2\u30fc\u30c9\u3001\u5165\u529b\u5074\u30de\u30b9\u30bf\u30e2\u30fc\u30c9\u3001\u51fa\u529b\u5074\u30de\u30b9\u30bf\u30e2\u30fc\u30c9\uff09\u3068\u5165\u529b\u3059\u308b\u30b7\u30b9\u30c6\u30e0\u30af\u30ed\u30c3\u30af\uff08\u30de\u30b9\u30bf\u30af\u30ed\u30c3\u30af\uff09\u306e\u5468\u6ce2\u6570\u8a2d\u5b9a\uff08FS x 128, 256, 512\uff09\u3001\u5165\u529b\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e\u6307\u5b9a\uff08\u53f3\u5bc4\u305bRJ\uff1a16,18,20,24\u3000\u5de6\u5bc4\u305b\uff1a 24\u3000I2S\uff1a24 \uff09\u51fa\u529b\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\uff08\u5de6\u5bc4\u305b\u3001\u53f3\u5bc4\u305b\u3001I2S\u3001TDM\uff1a\u30d3\u30c3\u30c8\u9577\u300016\/18\/20\/24 \uff09\u306a\u3069\u3092\u304d\u3061\u3093\u3068\u8a2d\u5b9a\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\uff0e\u7279\u306b\u3001\u51fa\u529b\u3055\u308c\u308b\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u5468\u6ce2\u6570\u306f\u30b7\u30b9\u30c6\u30e0\u30af\u30ed\u30c3\u30af\u306e\u5468\u6ce2\u6570\u304c\u57fa\u6e96\u3068\u306a\u3063\u3066\u5909\u63db\u3055\u308c\u308b\u305f\u3081\u3001\u30b7\u30b9\u30c6\u30e0\u30af\u30ed\u30c3\u30af\u3092\u81ea\u7531\u306b\u5909\u66f4\u3067\u304d\u308b\u3088\u3046\u306a\u4ed5\u7d44\u307f\u304c\u306a\u3051\u308c\u3070\u601d\u3044\u901a\u308a\u306e\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u5468\u6ce2\u6570\u5909\u63db\u304c\u3067\u304d\u306a\u3044\u306e\u3067\u3001PLL\u3092\u7528\u3044\u3066\u4efb\u610f\u306e\u30af\u30ed\u30c3\u30af\u3092\u767a\u751f\u3055\u305b\u308b\u3053\u3068\u304c\u53ef\u80fd\u306a\u30af\u30ed\u30c3\u30af\u30b8\u30a7\u30cd\u30ec\u30fc\u30bf\u304c\u5fc5\u8981\u3060\uff0e\u4eca\u56de\u306f\u540c\u3058\u304f\u30c7\u30b8\u30c3\u30c8\u306e\u300ePLL\u30af\u30ed\u30c3\u30af\u57fa\u677fCLK_1707D<\/a>\u300f\u3092\u5229\u7528\u3057\u305f\uff0e<\/p>\r\n
\r\n

Amanero Combo384\u3084DIYINHK\u306eXMOS\u306a\u3069\u306eUSB DDC\u306e\u30c7\u30b8\u30bf\u30eb\u51fa\u529b\u4fe1\u53f7(I2S)\u3092SRC4192\u306e\u5165\u529b\u3068\u3057\u3066\u4f7f\u7528\u3059\u308b\u5834\u5408\u306f\u3001MCK\u4fe1\u53f7\u3068\u3057\u3066 44.1KHz\u7cfb\uff0888.2\/176.4\/352.8KHz\uff09\u306e\u5834\u5408\u306f22.5792MHz\u300148KHz\u7cfb\uff0832.0\/48.0\/64.0\/96.0\/192\/384KHz\uff09\u306e\u5834\u5408\u306f24.576MHz\u306eMCK\u4fe1\u53f7\u304c\u51fa\u529b\u3055\u308c\u308b\uff0e\u3053\u306e\u5834\u5408\u3001\u9078\u629e\u53ef\u80fd\u306a\u51fa\u529b\u5074\u306e\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u5468\u6ce2\u6570\u306f\u300144.1KHz\u7cfb\u306e\u5834\u5408\u300122.5792MHz\/128 = 176.4KHz\u300122.5792MHz\/256 = 88.2KHz\u300122.5792MHz\/512 = 44.1KHz \u306e3\u901a\u308a\u306e\u7d44\u307f\u5408\u308f\u305b\u3057\u304b\u9078\u3079\u306a\u3044\uff0e\u540c\u69d8\u306b\u300148KHz\u7cfb\u306e\u5834\u5408\u306f 192KHz\u300196KHz, 48KHz \u306e3\u629e\u3068\u3044\u3046\u4e8b\u306b\u306a\u308b\uff0e<\/p>\r\n
\r\n

44.1kHz\u7cfb\u5217\u306848kHz\u7cfb\u5217\u306e\u9593\u3067\u76f8\u4e92\u306b\u5909\u63db\u3059\u308b\u305f\u3081\u306b\u306f\u3001\u30b7\u30b9\u30c6\u30e0\u30af\u30ed\u30c3\u30af\u5074\u3067\u51fa\u529b\u3059\u308b\u4fe1\u53f7\u306e\u7cfb\u5217\u306b\u5408\u308f\u305b\u305f\u7d30\u304b\u306a\u30af\u30ed\u30c3\u30af\u5468\u6ce2\u6570\u306e\u5236\u5fa1\u304c\u5fc5\u8981\u306b\u306a\u308b\u306e\u3067\u3001SRC4192\u3092\u4f7f\u3044\u3053\u306a\u3059\u305f\u3081\u306b\u306f\u81ea\u7531\u5ea6\u306e\u9ad8\u3044\u30af\u30ed\u30c3\u30af\u30b8\u30a7\u30cd\u30ec\u30fc\u30bf\u304c\u5fc5\u9808\u3068\u8a00\u3048\u3088\u3046\uff0e<\/p>\r\n
\r\n

\u3010ASRC\u3092\u4f7f\u3046\u5229\u70b9\u3011<\/b><\/p>\r\n
\r\n

MCK\u4fe1\u53f7\u304c\u51fa\u529b\u3055\u308c\u306a\u3044Raspberry Pi 2 + Volumio \u306e\u7d44\u307f\u5408\u308f\u305b\u3067\u3001PCM1792\u306e\u3088\u3046\u306a\u9ad8\u6027\u80fdDAC\u3092\u7528\u3044\u308b\u5834\u5408\u306e\u65b9\u6cd5\u306b\u3064\u3044\u3066\u7c21\u5358\u306b\u7d39\u4ecb\u3057\u3066\u304d\u305f\u304c\u3001ASRC\u3092\u4f7f\u3046\u6700\u5927\u306e\u5229\u70b9\u306f\u4f55\u3068\u8a00\u3063\u3066\u3082\u3001\u30b8\u30c3\u30bf\u30fc\u306e\u5f71\u97ff\u3092\u5c11\u306a\u304f\u3059\u308b\u4e8b\u304c\u3067\u304d\u308b\u4e8b\u3060\u308d\u3046\uff0eRaspberry Pi 2\u306e\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u306f\u304b\u306a\u308a\u9ad8\u6027\u80fd\u306aARM\u30c1\u30c3\u30d7\u304c\u4f7f\u308f\u308c\u3066\u304a\u308a\u3001\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u306e\u30af\u30ed\u30c3\u30af\u3082\u9ad8\u901f\u5316\u3055\u308c\u3066\u3044\u308b\u306e\u3067\u3001\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u7684\u306b\u306f\u30b8\u30c3\u30bf\u30fc\u306e\u5f71\u97ff\u306f\u5c11\u306a\u304f\u306a\u3063\u3066\u3044\u308b\u3068\u601d\u308f\u308c\u308b\uff0e<\/p>\r\n
\r\n

\u3057\u304b\u3057\u306a\u304c\u3089\u3001Volumio\u81ea\u4f53\u306fLinux(Debian)\u30d9\u30fc\u30b9\u306eOS\u3067\u52d5\u3044\u3066\u3044\u308b\u305f\u3081\u3001\u30b7\u30d3\u30a2\u306a\u5272\u308a\u8fbc\u307f\u51e6\u7406\u304c\u8981\u6c42\u3055\u308c\u308b\u5c02\u7528\u306eRTOS\uff08\u30ea\u30a2\u30eb\u30bf\u30a4\u30e0OS\uff09\u3068\u306f\u6bd4\u3079\u7269\u306b\u306a\u3089\u306a\u3044\u304f\u3089\u3044\u3001\u5404\u30d7\u30ed\u30bb\u30b9\u306e\u30bf\u30a4\u30df\u30f3\u30b0\u7cbe\u5ea6\u306f\u60aa\u3044\uff0eVolumio\u3067\u7528\u3044\u3089\u308c\u308bI2S\u4fe1\u53f7\u30c9\u30e9\u30a4\u30d0\u306f\u5f53\u7136\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u7684\u306a\u51e6\u7406\u306b\u3088\u308b\u7269\u306a\u306e\u3067\u3001OS\u306e\u30ab\u30fc\u30cd\u30eb\u4e0a\u306e\u4ed6\u306e\u30d7\u30ed\u30bb\u30b9\u306e\u5f71\u97ff\u3092\u3082\u308d\u306b\u53d7\u3051\u3066\u3057\u307e\u3044\u3001\u51fa\u529b\u3055\u308c\u308bI2S\u4fe1\u53f7\u306e\u30af\u30ed\u30c3\u30af\u7cbe\u5ea6\u306e\u52a3\u5316\u3001\u3059\u306a\u308f\u3061\u30c7\u30b8\u30bf\u30eb\u30aa\u30fc\u30c7\u30a3\u30aa\u4fe1\u53f7\u306e\u30af\u30aa\u30ea\u30c6\u30a3\u30fc\u3092\u52a3\u5316\u3055\u305b\u308b\u30b8\u30c3\u30bf\u30fc\u304c\u5897\u52a0\u3057\u3066\u3057\u307e\u3046\uff0e<\/p>\r\n
\r\n

ASRC\u3092\u7528\u3044\u308b\u3053\u3068\u3067\u3001\u51fa\u529b\u3055\u308c\u308b\u30c7\u30b8\u30bf\u30eb\u30aa\u30fc\u30c7\u30a3\u30aa\u4fe1\u53f7\u306f\u30af\u30ed\u30c3\u30af\u30b8\u30a7\u30cd\u30ec\u30fc\u30bf\u306e\u9ad8\u7cbe\u5ea6\u306a\u6c34\u6676\u767a\u632f\u5668\u306b\u3088\u3063\u3066\u751f\u6210\u3055\u308c\u305f\u3001\u5b89\u5b9a\u3057\u305f\u30af\u30ed\u30c3\u30af\u306b\u57fa\u3065\u304f\u30b8\u30c3\u30bf\u30fc\u306e\u5c11\u306a\u3044\u30c7\u30a3\u30b8\u30bf\u30eb\u30aa\u30fc\u30c7\u30a3\u30aa\u4fe1\u53f7\u3092DAC\u306b\u5f15\u304d\u6e21\u3059\u4e8b\u304c\u53ef\u80fd\u306b\u306a\u308b\uff0e\u3064\u307e\u308a\u5165\u529b\u5074\u306e\u30b8\u30c3\u30bf\u30fc\u306e\u5f71\u97ff\u304cASRC\u306b\u3088\u3063\u3066\u4f4e\u6e1b\u3055\u308c\u308b\u3068\u3044\u3046\u4e8b\u3060\uff0e<\/p>\r\n
\r\n
\r\n

Volumio\u306eI2S\u4fe1\u53f7\u306f\u3061\u3087\u3063\u3068\u5384\u4ecb<\/h4>\r\n
\r\n

\u3053\u308c\u307e\u3067\u3001\u30c7\u30b8\u30c3\u30c8\u306e\u30c7\u30b8\u30bf\u30eb\u30aa\u30fc\u30c7\u30a3\u30aa\u30ad\u30c3\u30c8\u306e\u7d44\u307f\u5408\u308f\u305b\u3068\u3001Amanero Combo384\u3084DIYINHK\u306eXMOS USB\u306a\u3069\u306eDDC\u3068\u306e\u7d44\u307f\u5408\u308f\u305b\u3067\u4f55\u306e\u554f\u984c\u3082\u7121\u304f\u5feb\u8abf\u306b\u52d5\u3044\u3066\u3044\u305f\u306e\u3067\u3001\u4eca\u56de\u3082Raspberry Pi 2 + Volumio\u306b\u3088\u308bI2S\u4fe1\u53f7\u3082\u4f55\u306e\u554f\u984c\u3082\u7121\u304f\u97f3\u304c\u51fa\u308b\u3082\u306e\u3068\u601d\u3063\u3066\u3044\u305f\uff0e\u3068\u3053\u308d\u304c\u5b9f\u969b\u306bVolumio\u3067\u97f3\u51fa\u3057\u3057\u3066\u307f\u308b\u3068\u3001\u97f3\u6e90\u306e\u7a2e\u985e\u306b\u3088\u3063\u3066\u306f\u6b63\u5e38\u306b\u518d\u751f\u3067\u304d\u306a\u3044\u4e8b\u304c\u5224\u660e\u3057\u305f\uff0eVolumio\u306b\u767b\u9332\u3055\u308c\u3066\u3044\u308b\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30e9\u30b8\u30aa\u3067\u3082\u3001\u518d\u751f\u53ef\u80fd\u306a\u5c40\u3068\u5168\u304f\u97f3\u304c\u51fa\u306a\u3044\u5c40\u306b\u5206\u304b\u308c\u3066\u3044\u308b\uff0eNAS\u7b49\u306b\u7f6e\u3044\u305f\u97f3\u6e90\u3082\u518d\u751f\u3067\u304d\u308b\u3082\u306e\u3068\u305d\u3046\u3067\u306a\u3044\u3082\u306e\u306b\u5206\u304b\u308c\u3066\u3044\u308b\uff0e96KHz24bit\u306e\u97f3\u6e90\u306f\u3069\u308c\u3082\u554f\u984c\u7121\u304f\u518d\u751f\u3067\u304d\u3066\u3044\u308b\u304c\u3001\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u6b86\u3069\u3092\u5360\u3081\u3066\u3044\u308bCD\u304b\u3089\u30ea\u30c3\u30d4\u30f3\u30b0\u3057\u305f44.1kHZ\/16bit\u7cfb\u306e\u97f3\u6e90\u304c\u5168\u3066\u518d\u751f\u3067\u304d\u306a\u3044\uff0e<\/p>\r\n
\r\n

\u4f55\u3088\u308a\u3082\u554f\u984c\u306a\u306e\u306f\u3001iTunes\u306a\u3069\u304b\u3089Volumio\u306eAirPlay\u7d4c\u7531\u3067\u518d\u751f\u3059\u308b\u5834\u5408\u300144.1KHz\/16bit\u30e2\u30fc\u30c9\u3067\u306e\u518d\u751f\u3068\u306a\u308b\u306e\u3067\u3001\u3053\u306e\u5834\u5408\u3082\u97f3\u304c\u5168\u304f\u51fa\u3066\u3053\u306a\u3044\u3053\u3068\u3060\uff0e\u79c1\u306e\u5834\u5408\u306fiTunes\u304b\u3089\u306eAirPlay\u518d\u751f\u306e\u305f\u3081\u3060\u3051\u306b\u5c0e\u5165\u3057\u305f\u306e\u3067\u3001\u6b63\u5e38\u306b\u518d\u751f\u3067\u304d\u306a\u3044\u3068\u3044\u3046\u306e\u3067\u306f\u5168\u304f\u610f\u5473\u304c\u7121\u3044\u306e\u3060\uff0e<\/p>\r\n
\r\n

\u6700\u521d\u306f\u518d\u751f\u3067\u304d\u306a\u3044\u539f\u56e0\u304c\u5168\u304f\u5224\u3089\u305a\u3001\u30aa\u30b7\u30ed\u30b9\u30b3\u30fc\u30d7\u7b49\u3067\u518d\u751f\u3067\u304d\u308b\u697d\u66f2\u3084\u30e9\u30b8\u30aa\u5c40\u3068\u306e\u9055\u3044\u3092\u8abf\u3079\u3066\u884c\u304f\u3046\u3061\u306b\u3001\u518d\u751f\u3067\u304d\u306a\u3044\u6642\u306eBCK\u306e\u5468\u6ce2\u6570\u304c\u60f3\u5b9a\u3088\u308a\u3082\u4f4e\u3044\u3053\u3068\u306b\u6c17\u304c\u4ed8\u3044\u305f\uff0e\u6b63\u5e38\u306b\u518d\u751f\u3055\u308c\u3066\u3044\u308b\u5834\u5408\u306eBCK\u306e\u5468\u6ce2\u6570\u306f\u7d042.82MHz\u300144.1kHZ\/16bit\u7cfb\u306e\u97f3\u6e90\u306e\u5834\u5408\u306f\u7d041.41MHz\u3068\u306a\u3063\u3066\u3044\u308b\uff0eBCK\u306e\u5468\u6ce2\u6570\u306fDAC\u306b\u3088\u308b\u9055\u3044\u306f\u3042\u308b\u304c\u3001\u901a\u5e38LRCK\u306e1\u5468\u671f\uff081\/fs\uff1a\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u5468\u6ce2\u6570\uff09\u306e\u9593\u306b\u5404\u30c1\u30e3\u30f3\u30cd\u30eb32\u30d3\u30c3\u30c8\u306e\u30c7\u30fc\u30bf\u304c\u57cb\u3081\u8fbc\u307e\u308c\u3066\u3044\u308b\uff0e\u3064\u307e\u308a\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u5468\u6ce2\u6570fs\u309264\u500d\u3057\u305f\u5024\u3067\u3042\u308a\u300144.1kHz\u306e\u5834\u5408\u306eBCK\u306f 44.1KHz X 64 = 2.8224MHz \u3068\u306a\u308b\uff0eBCK\u304c\u7d041.41MHz\u3068\u3044\u3046\u3053\u3068\u306fLRCK\u306e1\u5468\u671f\u4e2d\u306b32\u500b\u306eBCK\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u3068\u3044\u3046\u3053\u3068\u306b\u306a\u308a\u3001\u4e00\u822c\u7684\u306aDAC\u304c\u60f3\u5b9a\u3057\u3066\u3044\u308b64\u500b\u306eBCK\u4fe1\u53f7\u3067\u306f\u306a\u3044\u3053\u3068\u304c\u97f3\u304c\u51fa\u306a\u3044\u539f\u56e0\u3068\u601d\u308f\u308c\u308b\uff0e<\/p>\r\n
\r\n
\r\n

\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u30e1\u30a4\u30f3\u97f3\u6e90\u3067\u3042\u308b44.1KHz\/16bit\u4fe1\u53f7\u306f\u5168\u304f\u97f3\u304c\u51fa\u306a\u3044<\/h5>\r\n
\r\n
\r\n\"44.1KHz-\/16bit \r\n
\r\n44.1KHz\/16bit\u4fe1\u53f7\u306eLRCK\uff08\u4e0a\uff09\u3068BCK\uff08\u4e0b\uff09\u306e\u6ce2\u5f62<\/span>\r\n<\/div>\r\n

\r\n
\r\n\"44.1KHz\/16bit\r\n
\r\n44.1KHz\/16bit\u4fe1\u53f7\u306eDATA\uff08\u4e0a\uff09\u3068BCK\uff08\u4e0b\uff09\u306e\u6ce2\u5f62[ BCK: 44.1KHz X 32 = 1.4112MHz ] <\/span>\r\n<\/div>\r\n

\r\n
96KHz\/24bit\u4fe1\u53f7\u306f\u554f\u984c\u7121\u304f\u518d\u751f\u3055\u308c\u308b<\/h5>\r\n
\r\n
\r\n\"96KHz\/24bit\r\n
\r\n96KHz\/24bit\u4fe1\u53f7\u306eLRCK\uff08\u4e0a\uff09\u3068BCK\uff08\u4e0b\uff09\u306e\u6ce2\u5f62<\/span>\r\n<\/div>\r\n

\r\n
\r\n\"96KHz\/24bit\r\n
\r\n96KHz\/24bit\u4fe1\u53f7\u306eDATA\uff08\u4e0a\uff09\u3068BCK\uff08\u4e0b\uff09\u306e\u6ce2\u5f62\u3000[ BCK: 96KHz X 64 = 6.144MHz ] <\/span>\r\n<\/div>\r\n

\r\n

PCM5102\u3092\u7528\u3044\u3066\u97f3\u51fa\u3057\u3092\u3057\u3066\u3044\u305f\u3068\u304d\u306b\u306f44.1kHZ\/16bit\u7cfb\u306e\u97f3\u6e90\u3082\u6b63\u5e38\u306b\u518d\u751f\u3067\u304d\u3066\u3044\u308b\u306e\u3067\u3001PCM5102\u306e\u30c7\u30fc\u30bf\u30b7\u30fc\u30c8\u3067DAC\u306e\u53d7\u3051\u5165\u308c\u53ef\u80fd\u306a\u30c7\u30fc\u30bf\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3092\u898b\u305f\u3068\u3053\u308d\u300144.1kHZ\u306e\u5834\u5408\u306f\u3001BCK\u306e\u5468\u6ce2\u6570\u3068\u3057\u3066fsX32\uff081.4112MHz\uff09\u3068fsx64\uff082.8224MHz\uff09\u306e\u4e21\u65b9\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u4e8b\u304c\u78ba\u8a8d\u3067\u304d\u308b\uff0e<\/p>\r\n
\r\n

\u4eca\u56de\u306fASRC\u304cDAC\u306e\u524d\u306b\u5165\u308b\u306e\u3067\u3001SRC4192\u306e\u30c7\u30fc\u30bf\u30b7\u30fc\u30c8\u3067BCK\u306e\u30aa\u30da\u30ec\u30fc\u30b7\u30e7\u30f3\u6761\u4ef6\u3092\u8abf\u3079\u3066\u307f\u305f\u3068\u3053\u308d\u3001\u3084\u306f\u308a\u30de\u30b9\u30bf\u30fc\u30e2\u30fc\u30c9\u3067\u306e\u5165\u529b\u5074\u306eBCK\u306f64fs\u306b\u56fa\u5b9a\u3055\u308c\u3066\u3044\u305f\uff0eSRC4192\u3067\u306f\u5165\u529b\u5074\u306eBCK\u304c32fs\u3067\u306f\u52d5\u4f5c\u3057\u306a\u3044\u3068\u3044\u3046\u4e8b\u3060\uff0e\u3046\u30fc\u3093\u56f0\u3063\u305f\uff0e\uff0e\uff0e<\/p>\r\n
\r\n
\r\n

Volumio\u306e\u30ea\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u6a5f\u80fd\u3092\u8a66\u3057\u3066\u307f\u305f\u304c\uff0e\uff0e\uff0e<\/h4>\r\n
\r\n

Volumio\u306b\u306f\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u7684\u306b\u30ea\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u3092\u884c\u3046\u6a5f\u80fd\u304c\u5099\u308f\u3063\u3066\u304a\u308a\u3001”MENU” \u2192 “Playback” \u4e2d\u306b “Resampling” \u306b\u95a2\u3059\u308b\u8a2d\u5b9a\u3092ON\u306b\u3059\u308b\u3068\u3001Volumio\u306e\u30e1\u30c7\u30a3\u30a2\u30d7\u30ec\u30a4\u30e4\u30fc\u304c\u30ea\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u3092\u884c\u3044\u3001\u4efb\u610f\u306e\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u5468\u6ce2\u6570\u3068\u30d3\u30c3\u30c8\u6570\u3067\u30c7\u30b8\u30bf\u30eb\u51fa\u529b\u3059\u308b\u6a5f\u80fd\u304c\u3042\u308b\uff0e\u6a5f\u80fd\u7684\u306b\u306fASRC\u3068\u540c\u3058\u3082\u306e\u3060\u304c\u3001\u3053\u3061\u3089\u306f\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u51e6\u7406\u306a\u306e\u3067Raspberry Pi\u306eCPU\u306b\u4f59\u8a08\u306a\u8ca0\u8377\u304c\u639b\u304b\u308a\u3001\u4f59\u8a08\u306b\u30b8\u30c3\u30bf\u30fc\u304c\u60aa\u5316\u3057\u305d\u3046\u306a\u306e\u3067\u3067\u304d\u308c\u3070\u4f7f\u7528\u3057\u305f\u304f\u306a\u3044\uff0e\u3068\u308a\u3042\u3048\u305a\u3053\u306e\u6a5f\u80fd\u3092”ON”\u306b\u3059\u308b\u4e8b\u3067BCK\u306e32fs\u554f\u984c\u306f\u89e3\u6c7a\u3067\u304d\u305d\u3046\u3060\uff0e<\/p>\r\n
\r\n

\r\n

\r\n\"Volumio \r\n
\r\nVolumio\u306e\u30ea\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u6a5f\u80fd\u3092\u8a2d\u5b9a\u3057\u3066BCK\u306e32fs\u554f\u984c\u3092\u56de\u907f\u3057\u3066\u307f\u308b <\/span>\r\n<\/div>\r\n

\r\n

\u51fa\u529b\u30e2\u30fc\u30c9\u306e\u8a2d\u5b9a\u9805\u76ee\u3068\u3057\u3066\u3001
\r\n
\r\n  \u3000\u3000”disbaled”
\r\n  \u3000\u3000”16bit\/44.1KHz”
\r\n  \u3000\u3000”16bit\/96.0KHz”
\r\n  \u3000\u3000”24bit\/44.1KHz”
\r\n  \u3000\u3000”24bit\/96.0KHz”
\r\n  \u3000\u3000”24bit\/192KHz”
\r\n  \u3000\u3000”32bit\/44.1KHz”
\r\n  \u3000\u3000”32bit\/96.0KHz”
\r\n  \u3000\u3000”32bit\/192KHz”
\r\n  \u3000\u3000”32bit\/384KHz”
\r\n
\r\n\u304c\u9078\u629e\u53ef\u80fd\u3060\uff0e\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u5468\u6ce2\u6570\u306e\u5909\u63db\u306f\u4e0d\u8981\u306a\u306e\u3067\u3001\u5358\u7d14\u306b\u91cf\u5b50\u5316\u30d3\u30c3\u30c8\u6570\u3060\u3051\u309224bit\u4ee5\u4e0a\u306b\u3059\u308c\u3070 BCK\u304c64fs\u306b\u306a\u308b\u306e\u3067\u90fd\u5408\u304c\u826f\u3044\u306e\u3060\u304c\u3001\u6b8b\u5ff5\u306a\u4e8b\u306b\u91cf\u5b50\u5316\u30d3\u30c3\u30c8\u6570\u3060\u3051\u306e\u5909\u63db\u306f\u884c\u3048\u306a\u3044\u3088\u3046\u3060\uff0e\u5e38\u306b\u8a2d\u5b9a\u3057\u305f\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u5468\u6ce2\u6570\u306b\u5909\u63db\u3055\u308c\u3066\u3057\u307e\u3046\u306e\u3067\u3001\u6298\u89d2\u306e\u30cf\u30a4\u30ec\u30be\u97f3\u6e90\u3082\u8a2d\u5b9a\u306b\u3088\u3063\u3066\u306f\u30c0\u30a6\u30f3\u30b0\u30ec\u30fc\u30c9\u3055\u308c\u305f\u72b6\u614b\u3067\u518d\u751f\u3055\u308c\u3066\u3057\u307e\u3046\uff0e<\/p>\r\n
\r\n

\r\n

\r\n\"Volumio \r\n
\r\nVolumio\u306e\u30e1\u30c7\u30a3\u30a2\u30d7\u30ec\u30a4\u30e4\u30fc\u6a5f\u80fd\u3092\u4f7f\u3063\u306644.1KHz\/16bit\u97f3\u6e90\u3092\u518d\u751f\u3057\u3066\u307f\u308b <\/span>\r\n

\r\n\"44.1Khz\/16bit\r\n
\r\n44.1KHz\/16bit\u97f3\u6e90\u304c BCK 64fs\u3067\u304d\u3061\u3093\u3068\u518d\u751f\u3055\u308c\u308b\u3088\u3046\u306b\u306a\u3063\u305f <\/span>\r\n

\r\n\"I2S\r\n
\r\n\u30aa\u30b7\u30ed\u30b9\u30b3\u30fc\u30d7\u306e\u540c\u671f\u3092\u8abf\u6574\u3057\u3066\u3001LRCK\u4fe1\u53f7\uff08\u4e0b\uff09\u3068DATA\u4fe1\u53f7\uff08\u4e0a\uff09\u306e\u95a2\u4fc2\u3092\u5206\u304b\u308a\u6613\u304f\u8868\u793a\u3057\u3066\u307f\u305f<\/span>\r\n

\r\n<\/div>\r\n\r\n

\u5b9f\u969b\u306b”24bit\/96.0KHz”\u306b\u8a2d\u5b9a\u3057\u3066\u307f\u308b\u3068\u3001\u4e00\u5fdc44.1KHz\/16bit\u97f3\u6e90\u306e\u30c7\u30fc\u30bf\u3082BCK\u304c64fs(2.8224MHz)\u3068\u306a\u308a\u304d\u3061\u3093\u3068\u518d\u751f\u3055\u308c\u308b\u3088\u3046\u306b\u306a\u3063\u305f\u304c\u3001\u88dc\u9593\u65b9\u6cd5\u3068\u3057\u3066 “Best Sinc Interpolator” \u3092\u9078\u3076\u3068CPU\u306e\u8ca0\u8377\u304c\u9ad8\u904e\u304e\u308b\u306e\u304b\u518d\u751f\u304c\u4e0d\u5b89\u5b9a\u306b\u306a\u3063\u3066\u3057\u307e\u3063\u305f\uff0e\u3084\u306f\u308aVolumio\u306e\u30ea\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u6a5f\u80fd\u306f\u4f7f\u3044\u3082\u306e\u306b\u306a\u3089\u306a\u3044\u3088\u3046\u3060\uff0e<\/p>\r\n
\r\n

\u3068\u308a\u3042\u3048\u305a\u30ea\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u6a5f\u80fd\u3067BCK\u306e32fs\u554f\u984c\u306f\u4e00\u5fdc\u89e3\u6c7a\u3057\u305f\u304b\u306b\u601d\u3048\u305f\u304c\u3001\u79c1\u306b\u3068\u3063\u3066Volumio\u3092\u4f7f\u3046\u6700\u5927\u306e\u52d5\u6a5f\u3067\u3042\u3063\u305f”AirPlay”\u306b\u3088\u308b\u518d\u751f\u6a5f\u80fd\u306b\u95a2\u3057\u3066\u306f\u3001\u3053\u306e\u30ea\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u6a5f\u80fd\u306f\u5168\u304f\u50cd\u304b\u306a\u3044\u4e8b\u304c\u5224\u660e\u3057\u305f\uff0e”AirPlay”\u7d4c\u7531\u3067iTunes\u7b49\u304b\u3089\u518d\u751f\u3057\u3066\u3082\u3001\u5e38\u306b44.1KHz\/16bit\u30e2\u30fc\u30c9\u3067\u518d\u751f\u3055\u308c\u3066\u3057\u307e\u3044\u3001BCK\u304c32fs\u306e\u307e\u307e\u306a\u306e\u3067\u3001\u7d50\u5c40”AirPlay”\u3067\u306f\u518d\u751f\u3067\u304d\u306a\u3044\u3068\u3044\u3046\u4e8b\u306e\u3088\u3046\u3060\uff0e\u3053\u308c\u3092\u56de\u907f\u3059\u308b\u306b\u306f\u3001Volumio\u306eI2S\u30c9\u30e9\u30a4\u30d0\u305d\u306e\u3082\u306e\u3092\u66f8\u304d\u63db\u3048\u3066\u5e38\u306bBCK\u304c64fs\u306b\u306a\u308b\u3088\u3046\u306b\u5909\u66f4\u3059\u308b\u304b\u3001\u4f55\u3089\u304b\u306e\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u306b\u3088\u308b\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u5909\u63db\u88c5\u7f6e\u3092\u5c0e\u5165\u3059\u308b\u3057\u304b\u65b9\u6cd5\u306f\u7121\u3055\u305d\u3046\u3060\uff0e<\/p>\r\n
\r\n

Raspberry Pi + Volumio\u306e\u7d44\u307f\u5408\u308f\u305b\u3067\u306f\u3001\u6e80\u8db3\u306a\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30aa\u30fc\u30c7\u30a3\u30aa\u30d7\u30ec\u30a4\u30e4\u30fc\u3092\u4f5c\u308b\u306e\u306f\u96e3\u3057\u305d\u3046\u3060\uff0e\u4f55\u3088\u308a\u3082\u554f\u984c\u306a\u306e\u306f\u3001Raspberry Pi\u306e\u30b7\u30b9\u30c6\u30e0\u304cLinux\u30d9\u30fc\u30b9\u3067\u96fb\u6e90\u30b9\u30a4\u30c3\u30c1\u306eON\/OFF\u3060\u3051\u3067\u7c21\u5358\u306b\u64cd\u4f5c\u3067\u304d\u306a\u3044\u4e8b\u3060\u308d\u3046\uff0e\u4e00\u3005\u30b7\u30e3\u30c3\u30c8\u30c0\u30a6\u30f3\u51e6\u7406\u3057\u306a\u3051\u308c\u3070\u96fb\u6e90\u3092\u5207\u308b\u3053\u3068\u3059\u3089\u3067\u304d\u306a\u3044\u3068\u3044\u3046\u306e\u306f\u30aa\u30fc\u30c7\u30a3\u30aa\u6a5f\u5668\u3068\u3057\u3066\u306f\u81f4\u547d\u7684\u306a\u6b20\u9665\u3067\u3001\u6b8b\u5ff5\u3060\u304c\u5f53\u9762\u306f\u3054\u304f\u4e00\u90e8\u306e\u30cb\u30c3\u30c1\u306a\u30e6\u30fc\u30b6\u306e\u305f\u3081\u3060\u3051\u306e\u30de\u30cb\u30a2\u30c3\u30af\u306a\u30b7\u30b9\u30c6\u30e0\u306e\u307e\u307e\u3060\u308d\u3046\uff0eRaspberry Pi \u306f\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u5c4b\u3055\u3093\u306e\u304a\u3082\u3061\u3083\u3068\u3057\u3066\u306f\u6700\u9ad8\u306e\u904a\u3073\u9053\u5177\u3060\u304c\u3001\u30aa\u30fc\u30c7\u30a3\u30aa\u5c4b\u3055\u3093\u306b\u3068\u3063\u3066\u306f\u6577\u5c45\u304c\u9ad8\u904e\u304e\u308b\u3088\u3046\u3060\uff0e<\/p>\r\n
\r\n
\r\n

\r\n

Volumio \u306eI2S\u30b5\u30a6\u30f3\u30c9\u30c9\u30e9\u30a4\u30d0\u30fc\u5efb\u308a\u3092\u5c11\u3057\u3060\u3051\u63a2\u3063\u3066\u307f\u305f<\/h4>\r\n
\r\n

Raspberry Pi + Volumio + \u81ea\u4f5cDAC \u306e\u7d44\u5408\u308f\u305b\u3067\u306f\u554f\u984c\u304c\u751f\u3058\u3066\u3057\u307e\u3063\u305f\u304c\u3001\u3053\u306e\u307e\u307e\u8ae6\u3081\u308b\u306e\u306f\u766a\u306a\u306e\u3067\u554f\u984c\u89e3\u6c7a\u306e\u7cf8\u53e3\u3092\u63a2\u3063\u3066\u307f\u308b\u3053\u3068\u306b\u3057\u305f\uff0e\u89e3\u6c7a\u306e\u7cf8\u53e3\u3068\u3057\u3066\u306f\uff12\u3064\u6709\u308b\u3068\u8ff0\u3079\u305f\u304c\u3001\u5148\u305a\u306f\u305d\u306e\u3046\u3061\u306e\u4e00\u3064\u3001\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u306b\u3088\u308b\u89e3\u6c7a\u65b9\u6cd5\u3092\u63a2\u3063\u3066\u307f\u308b\uff0e<\/p>\r\n
\r\n

\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u306b\u3088\u308b\u89e3\u6c7a\u3068\u3044\u3063\u3066\u3082\u305d\u308c\u7a0b\u5927\u639b\u304b\u308a\u306a\u7269\u3067\u306f\u7121\u304f\u3001\u5358\u306b\u4eca\u4f7f\u3063\u3066\u3044\u308bTI\u306eSRC4192\u306e\u4f7f\u7528\u3092\u6b62\u3081\u3066\u5225\u306aASRC\u30c1\u30c3\u30d7\u3092\u4f7f\u3046\u4e8b\u3092\u691c\u8a0e\u3059\u308b\u3060\u3051\u306e\u4e8b\u3060\uff0e\u5225\u306aASRC\u30c1\u30c3\u30d7\u306e\u5019\u88dc\u3068\u3057\u3066\u306f\u3001\u65ed\u5316\u6210\u30a8\u30ec\u30af\u30c8\u30ed\u30cb\u30af\u30b9\u793e\u306eAK4137\u3068\u3044\u3046\u6700\u65b0\u306eASRC\u30c1\u30c3\u30d7\u304c\u771f\u3063\u5148\u306b\u6d6e\u304b\u3076\u3060\u308d\u3046\uff0e\u3053\u306e\u30c1\u30c3\u30d7\u306f\u5148\u6708\u304f\u3089\u3044\u306b\u5e02\u5834\u306b\u51fa\u307e\u308f\u308b\u3088\u3046\u306b\u306a\u3063\u305f\u6700\u65b0\u306e\u30c1\u30c3\u30d7\u3067\u3001\u5b9f\u306f\u65e2\u306bDigi-Key\u7d4c\u7531\u3067\uff12\u3064\u7a0b\u8cfc\u5165\u3057\u3066\u3042\u308b\uff0e\u6642\u9593\u304c\u7121\u304f\u3066\u307e\u3060\u3053\u306e\u30c1\u30c3\u30d7\u3092\u7d44\u307f\u8fbc\u3093\u3060\u30b7\u30b9\u30c6\u30e0\u306f\u88fd\u4f5c\u3057\u3066\u3044\u306a\u3044\u304c\u3001\u30c7\u30fc\u30bf\u30b7\u30fc\u30c8\u3092\u898b\u308b\u9650\u308aPCM\/DSD\u306e\u76f8\u4e92\u5909\u63db\u304c\u3067\u304d\u308b\u306a\u3069\u3001\u4f55\u3067\u3082\u3054\u3056\u308c\u306e\u6a5f\u80fd\u6e80\u8f09\u30c1\u30c3\u30d7\u306e\u3088\u3046\u3060\uff0e<\/p>\r\n
\r\n\u3000\u30fbAK4137EQ 768kHz 2ch Asynchronous 32-bit Premium SRC<\/a>\r\n
\r\n
\r\n

AK4137EQ\u306e\u30c7\u30fc\u30bf\u30b7\u30fc\u30c8<\/a>\u3092\u898b\u308b\u3068\u300142 page \u306e”\u5165\u529b\u30dd\u30fc\u30c8\u306e\u30b7\u30b9\u30c6\u30e0\u30af\u30ed\u30c3\u30af\u3068\u30aa\u30fc\u30c7\u30a3\u30aa\u30a4\u30f3\u30bf\u30d5\u30a7\u30fc\u30b9\u30d5\u30a9\u30fc\u30de\u30c3\u30c8”\u306e\u8a18\u8ff0\u306b\u3001”Mode 3: 32\/16bit, I2S Compatible” \u3068\u3044\u3046\u9805\u76ee\u304c\u8a18\u8f09\u3055\u308c\u3066\u304a\u308a\u3001”16bit, I2S Compatible: IBICK 32fs” \u3068\u306a\u3063\u3066\u3044\u308b\u306e\u3067\u3001\u3053\u306e\u30e2\u30fc\u30c9\u3092\u4f7f\u3048\u3070Volumio\u306e BCK 32fs \u554f\u984c\u306f\u89e3\u6c7a\u3067\u304d\u305d\u3046\u3060\uff0e<\/p>\r\n
\r\n

AK4137\u3092\u4f7f\u3063\u305fASRC\u306e\u88fd\u4f5c\u8a18\u4e8b\u306b\u3064\u3044\u3066\u306f\u3001\u3042\u308b\u7a0b\u5ea6\u5b9f\u88c5\u304c\u7d42\u308f\u3063\u305f\u6bb5\u968e\u3067\u516c\u958b\u3059\u308b\u3064\u3082\u308a\u3060\uff0e\uff08\u3067\u3082\u4f55\u6642\u306b\u306a\u308b\u304b\u306f\u4e0d\u660e\uff09<\/p>\r\n
\r\n
\r\n

\u89e3\u6c7a\u65b9\u6cd5\u306e\u6b8b\u308a\u306e\u4e00\u3064\u304c\u3001Volumio\u306eI2S\u30b5\u30a6\u30f3\u30c9\u30c9\u30e9\u30a4\u30d0\u30fc\u5efb\u308a\u3092\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u30ec\u30d9\u30eb\u3067\u66f8\u304d\u63db\u3048\u3066\u3057\u307e\u3046\u3068\u3044\u3046\u65b9\u6cd5\u3060\u304c\u3001\u3053\u308c\u3092\u5b9f\u73fe\u3059\u308b\u306b\u306fLinux\u306e\u30ab\u30fc\u30cd\u30eb\u30ec\u30d9\u30eb\u3067\u306e\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u304b\u3089\u306e\u518d\u69cb\u7bc9\u4f5c\u696d\u304c\u5fc5\u8981\u3060\uff0e\u5148\u306b\u7d39\u4ecb\u3057\u305f\u300e\u307b\u30fc\u308a\u30fc\u3055\u3093\u306e\u65e5\u8a18\u300f\u306b\u3053\u306e\u8fba\u308a\u306e\u6539\u9020\u306b\u3064\u3044\u3066\u7d39\u4ecb\u3055\u308c\u3066\u3044\u308b\u306e\u3067\u3001\u5e7e\u3064\u304b\u95a2\u4fc2\u306e\u6df1\u305d\u3046\u306a\u30ea\u30f3\u30af\u3092\u8f09\u305b\u3066\u304a\u304f\uff0e<\/p>\r\n
\r\n
\r\n\u3000\u30fbVolumio\u306e\u69cb\u9020<\/a>\r\n
\r\n
\r\n\u3000\u30fbRaspberry PI \u306e\u30ab\u30fc\u30cd\u30eb\u30af\u30ed\u30b9\u30b3\u30f3\u30d1\u30a4\u30eb\u74b0\u5883\u3092\u4f5c\u308b<\/a>\r\n
\r\n
\r\n\u3000\u30fbVolumio\u3000\u3067\u30b8\u30c3\u30bf\u30fc\u3092\u7121\u7406\u3084\u308a\u306a\u304f\u3057\u3066\u307f\u308b<\/a>\r\n
\r\n
\r\n\u3000\u30fbVolumio1.55 \u3053\u3053\u307e\u3067\u306e\u307e\u3068\u3081<\/a>\r\n
\r\n
\r\n\u3000\u30fbVolumio \u306b 24bbit R-2R \u4e0a\u91ce DAC \u3092\u63a5\u7d9a\u3059\u308b<\/a>\r\n
\r\n
\r\n

\u5148\u305a\u306f\u3001Volumio1.55\uff08GitHub\u4e0a\u306b\u306f\u958b\u767a\u4e2d\u306eVolumio2.0\u304c\u6709\u308b\u3088\u3046\u3067\u3059\u304c\u3001\u3068\u308a\u3042\u3048\u305a\u4eca\u306f\u73fe\u884c\u306eV1.55\u306eLinux\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u3092\u5165\u624b\u3057\u3066\u304a\u304d\u307e\u3057\u3087\u3046\uff09\u306e\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u3092\u53d6\u5f97\u3057\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u304c\u3001Volumio\u306e\u30db\u30fc\u30e0\u30da\u30fc\u30b8\u3092\u6f01\u3063\u3066\u3082\u30a4\u30de\u30a4\u30c1\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u304c\u4f55\u51e6\u306b\u7f6e\u304b\u308c\u3066\u3044\u308b\u306e\u304b\u5224\u3089\u306a\u304b\u3063\u305f\uff0e\u300e\u307b\u30fc\u308a\u30fc\u3055\u3093\u306e\u65e5\u8a18\u300f\u306e “Raspberry PI \u306e\u30ab\u30fc\u30cd\u30eb\u30af\u30ed\u30b9\u30b3\u30f3\u30d1\u30a4\u30eb\u74b0\u5883\u3092\u4f5c\u308b” \u3067\u7d39\u4ecb\u3055\u308c\u3066\u3044\u308b URL\u3092\u53c2\u8003\u306b\u53d6\u5f97\u3057\u3066\u307f\u305f\uff0e
\r\n
\r\n\u3000\u3000\u3000git clone https:\/\/github.com\/raspberrypi\/linux.git
\r\n\u3000\u3000\u3000git clone https:\/\/github.com\/raspberrypi\/tools.git
\r\n
\r\n
\r\n

\u4e0a\u8a18\u30b3\u30de\u30f3\u30c9\u3067\u53d6\u5f97\u3057\u305f\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u3092\u63a2\u3063\u3066\u884c\u304f\u3068\u3001
\r\n
\r\n

\r\n\"Linux\r\n
\r\n\u53d6\u5f97\u3057\u305flinux\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u914d\u4e0b\u3092\u8997\u3044\u3066\u307f\u308b <\/span>\r\n
\r\n<\/div>\r\n
\r\n
\r\nI2S\u30b5\u30a6\u30f3\u30c9\u30c9\u30e9\u30a4\u30d0\u30fc\u5efb\u308a\u306e\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u306f\u3001”.\/linux\/sound\/soc\/bcm\/” \u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u914d\u4e0b\u306b\u7f6e\u304b\u308c\u3066\u3044\u308b\u3088\u3046\u3060 \uff0e”bcm2708-i2s.c”, “bcm2835-i2s.c”, “hifiberry_dac.c” \u304c\u4eca\u56de\u306eI2S\u30b5\u30a6\u30f3\u30c9\u5efb\u308a\u306e\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u3060\u308d\u3046\uff0e\u307e\u3060\u4e2d\u8eab\u3092\u304d\u3061\u3093\u3068\u8abf\u3079\u3066\u3044\u306a\u3044\u306e\u3067\u3001\u8a73\u3057\u3044\u4e8b\u306f\u5224\u3089\u306a\u3044\u304cBCK\u3084\u30aa\u30fc\u30c7\u30a3\u30aa\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306a\u3069\u306e\u5909\u66f4\u306f\u3001\u3053\u308c\u3089\u306e\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u3092\u66f8\u304d\u63db\u3048\u308c\u3070\u4f55\u3068\u304b\u306a\u308a\u305d\u3046\u3060\uff0e<\/p>\r\n
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Raspberry Pi 2 \u3067\u306f BCM2836 \u3068\u3044\u3046ARMV7 \u7cfb\u5217\u306eCPU\u30b3\u30a2\u304c\u4f7f\u308f\u308c\u3066\u3044\u308b\u304c\u3001”bcm2835-i2s.c”\u3092\u4f7f\u3046\u306e\u304b\u3001\u305d\u308c\u3068\u3082”bcm2708-i2s.c”\u306a\u306e\u304b\u306f\u73fe\u6642\u70b9\u3067\u306f\u4e0d\u660e\u3060\uff0e\u3072\u3087\u3063\u3068\u3059\u308b\u3068Raspberry Pi 2\u3067\u306f”bcm2836-i2s.c”\u306e\u3088\u3046\u306a\u30d5\u30a1\u30a4\u30eb\u304c\u5225\u306b\u7528\u610f\u3055\u308c\u3066\u3044\u308b\u306e\u304b\u3082\u3057\u308c\u306a\u3044\u304c\u3001\u591a\u5206BCK\u3084\u30aa\u30fc\u30c7\u30a3\u30aa\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306a\u3069\u306e\u5909\u66f4\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u90e8\u5206\u306f\u5171\u901a\u3060\u308d\u3046\uff0e<\/p>\r\n
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“bcm2708-i2s.c”, “bcm2835-i2s.c”\u3068”hifiberry_dac.c”\u306e\u95a2\u4fc2\u304c\u307e\u3060\u5224\u3089\u306a\u3044\u304c\u3001\u540d\u524d\u304b\u3089\u5bdf\u3059\u308b\u306b\u3001”hifiberry_dac.c”\u304cDAC\u30e2\u30b8\u30e5\u30fc\u30eb(PCM5102\u7cfb\u5217\u3092\u524d\u63d0\u306b\u4f5c\u3089\u308c\u3066\u3044\u308b\uff09\u306b\u95a2\u3059\u308b\u56fa\u6709\u306e\u60c5\u5831\u304c\u8a18\u8ff0\u3055\u308c\u3066\u304a\u308a\u3001ALSA\u30aa\u30fc\u30c7\u30a3\u30aa\u30c9\u30e9\u30a4\u30d0\u30fc\u3067\u3042\u308b\u3001”bcm2708-i2s.c”, “bcm2835-i2s.c”\u306bhifiberry_dac\u304c\u30ea\u30f3\u30af\u3055\u308c\u308b\u3088\u3046\u3060\uff0e”hifiberry_dac.c”\u306e\u4e2d\u8eab\u3092\u8997\u3044\u3066\u307f\u305f\u3089\u3001’ .cpu_dai_name = “bcm2708-i2s.0” ‘ \u3068\u3044\u3046\u9805\u76ee\u304c\u3042\u308b\u306e\u3067\u3001\u5b9f\u969b\u306b\u4f7f\u308f\u308c\u3066\u3044\u308b\u306e\u306f”bcm2708-i2s.c”\u306e\u65b9\u304b\u3082\u3057\u308c\u306a\u3044\uff0e\u3053\u306e\u8fba\u306e\u4ed5\u7d44\u307f\u306f\u307e\u3060\u4f55\u3082\u5224\u3063\u3066\u3044\u306a\u3044\u306e\u3067\u3001\u307e\u305f\u5f8c\u65e5\u6539\u3081\u3066\u691c\u8a3c\u3057\u3066\u307f\u3088\u3046\u3068\u601d\u3046\uff0e<\/p>\r\n
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Raspberry Pi \u7528\u306eLinux \u30c7\u30a3\u30b9\u30c8\u30ea\u30d3\u30e5\u30fc\u30b7\u30e7\u30f3\u3067\u3042\u308b Raspbian \u306e\u30ab\u30fc\u30cd\u30eb\u306e\u518d\u69cb\u7bc9\u4f5c\u696d\u306b\u3064\u3044\u3066\u306f\u3001Raspberry Pi\u3054\u672c\u5bb6\u306e HELP \u306b\u8aac\u660e\u304c\u3042\u308b\u306e\u3067\u3001\u3053\u3061\u3089\u3092\u53c2\u7167\u3057\u3066\u304a\u3044\u305f\u65b9\u304c\u826f\u3055\u305d\u3046\uff0e<\/p>\r\n
\r\n\u3000\u3000KERNEL BUILDING<\/a> : https:\/\/www.raspberrypi.org\/documentation\/linux\/kernel\/building.md\r\n
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“hifiberry_dac.c”\u306e\u4e2d\u306b\u3001
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\r\n\r\nstatic int snd_rpi_hifiberry_dac_hw_params(struct snd_pcm_substream *substream,\r\n\t\t\t\t       struct snd_pcm_hw_params *params)\r\n{\r\n\tstruct snd_soc_pcm_runtime *rtd = substream->private_data;\r\n\tstruct snd_soc_dai *cpu_dai = rtd->cpu_dai;\r\n\r\n\tunsigned int sample_bits =\r\n\t\tsnd_pcm_format_physical_width(params_format(params));\r\n\r\n\treturn snd_soc_dai_set_bclk_ratio(cpu_dai, sample_bits * 2);\r\n}\r\n\r\n<\/code><\/pre>\r\n
\r\n\u3068\u3044\u3046\u95a2\u6570\u304c\u3042\u308a\u3001DAC\u30c1\u30c3\u30d7\u306e\u30b5\u30f3\u30d7\u30eb\u30d3\u30c3\u30c8\u9577\u306e2\u500d\u3092BCK\u30ec\u30b7\u30aa\u306e\u5024\u3068\u3057\u3066\u8a2d\u5b9a\u3057\u3066\u3044\u308b\u3068\u3044\u3046\u3088\u3046\u306a\u90e8\u5206\u304c\u4f3a\u3048\u308b\u304c\u3001\u691c\u51fa\u3055\u308c\u308bsample_bits\u306e\u5024\u304c16\u306a\u306e\u304b\u3001\u305d\u308c\u3068\u308232\u306a\u306e\u304b\u306f\u73fe\u6642\u70b9\u3067\u306f\u4e0d\u660e\u3060\u304c\u3001\u591a\u5206\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306fsample_bits\u306e\u5024\u3068\u3057\u306616\u304c\u63a1\u3089\u308c\u3066\u3044\u308b\u306e\u304b\u3082\u3057\u308c\u306a\u3044\uff0e<\/p>\r\n
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\u3082\u3046\u4e00\u65b9\u306e”bcm2708-i2s.c”\u306e\u4e2d\u8eab\u306f”hifiberry_dac.c”\u3088\u308a\u3082\u8907\u96d1\u3067\u3001\u3056\u3063\u3068\u773a\u3081\u305f\u3060\u3051\u3067\u306f\u4f55\u304c\u4f55\u3060\u304b\u826f\u304f\u5206\u304b\u3089\u306a\u3044\u304c\u3001BCK\u306e\u5468\u6ce2\u6570\u3084\u30aa\u30fc\u30c7\u30a3\u30aa\u30c7\u30fc\u30bf\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306b\u95a2\u4fc2\u3057\u305d\u3046\u306a\u90e8\u5206\u304c\u6570\u30ab\u6240\u898b\u3064\u304b\u308b\uff0e<\/p>\r\n
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\r\nstatic int bcm2708_i2s_hw_params(struct snd_pcm_substream *substream,\r\n\t\t\t\t struct snd_pcm_hw_params *params,\r\n\t\t\t\t struct snd_soc_dai *dai)\r\n{\r\n\tstruct bcm2708_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);\r\n\r\n\tunsigned int sampling_rate = params_rate(params);\r\n\tunsigned int data_length, data_delay, bclk_ratio;\r\n\tunsigned int ch1pos, ch2pos, mode, format;\r\n\tunsigned int mash = BCM2708_CLK_MASH_1;\r\n\tunsigned int divi, divf, target_frequency;\r\n\tint clk_src = -1;\r\n\tunsigned int master = dev->fmt & SND_SOC_DAIFMT_MASTER_MASK;\r\n\tbool bit_master =\t(master == SND_SOC_DAIFMT_CBS_CFS\r\n\t\t\t\t\t|| master == SND_SOC_DAIFMT_CBS_CFM);\r\n\r\n\tbool frame_master =\t(master == SND_SOC_DAIFMT_CBS_CFS\r\n\t\t\t\t\t|| master == SND_SOC_DAIFMT_CBM_CFS);\r\n\tuint32_t csreg;\r\n\r\n\t\/*\r\n\t * If a stream is already enabled,\r\n\t * the registers are already set properly.\r\n\t *\/\r\n\tregmap_read(dev->i2s_regmap, BCM2708_I2S_CS_A_REG, &csreg);\r\n\r\n\tif (csreg & (BCM2708_I2S_TXON | BCM2708_I2S_RXON))\r\n\t\treturn 0;\r\n\r\n\tif (!dev->dev->of_node)\r\n\t\tbcm2708_i2s_setup_gpio();\r\n\r\n\t\/*\r\n\t * Adjust the data length according to the format.\r\n\t * We prefill the half frame length with an integer\r\n\t * divider of 2400 as explained at the clock settings.\r\n\t * Maybe it is overwritten there, if the Integer mode\r\n\t * does not apply.\r\n\t *\/\r\n\tswitch (params_format(params)) {\r\n\tcase SNDRV_PCM_FORMAT_S16_LE:\r\n\t\tdata_length = 16;\r\n\t\tbclk_ratio = 50;\r\n\t\tbreak;\r\n\tcase SNDRV_PCM_FORMAT_S24_LE:\r\n\t\tdata_length = 24;\r\n\t\tbclk_ratio = 50;\r\n\t\tbreak;\r\n\tcase SNDRV_PCM_FORMAT_S32_LE:\r\n\t\tdata_length = 32;\r\n\t\tbclk_ratio = 100;\r\n\t\tbreak;\r\n\tdefault:\r\n\t\treturn -EINVAL;\r\n\t}\r\n\r\n\t\/* If bclk_ratio already set, use that one. *\/\r\n\tif (dev->bclk_ratio)\r\n\t\tbclk_ratio = dev->bclk_ratio;\r\n\r\n\t\/*\r\n\t * Clock Settings\r\n\t *\r\n\t * The target frequency of the bit clock is\r\n\t *\tsampling rate * frame length\r\n\t *\r\n\t * Integer mode:\r\n\t * Sampling rates that are multiples of 8000 kHz\r\n\t * can be driven by the oscillator of 19.2 MHz\r\n\t * with an integer divider as long as the frame length\r\n\t * is an integer divider of 19200000\/8000=2400 as set up above.\r\n\t * This is no longer possible if the sampling rate\r\n\t * is too high (e.g. 192 kHz), because the oscillator is too slow.\r\n\t *\r\n\t * MASH mode:\r\n\t * For all other sampling rates, it is not possible to\r\n\t * have an integer divider. Approximate the clock\r\n\t * with the MASH module that induces a slight frequency\r\n\t * variance. To minimize that it is best to have the fastest\r\n\t * clock here. That is PLLD with 500 MHz.\r\n\t *\/\r\n\ttarget_frequency = sampling_rate * bclk_ratio;\r\n\tclk_src = BCM2708_CLK_SRC_OSC;\r\n\tmash = BCM2708_CLK_MASH_0;\r\n\r\n\tif (bcm2708_clk_freq[clk_src] % target_frequency == 0\r\n\t\t\t&& bit_master && frame_master) {\r\n\t\tdivi = bcm2708_clk_freq[clk_src] \/ target_frequency;\r\n\t\tdivf = 0;\r\n\t} else {\r\n\t\tuint64_t dividend;\r\n\r\n\t\tif (!dev->bclk_ratio) {\r\n\t\t\t\/*\r\n\t\t\t * Overwrite bclk_ratio, because the\r\n\t\t\t * above trick is not needed or can\r\n\t\t\t * not be used.\r\n\t\t\t *\/\r\n\t\t\tbclk_ratio = 2 * data_length;\r\n\t\t}\r\n\r\n\t\ttarget_frequency = sampling_rate * bclk_ratio;\r\n\r\n\t\tclk_src = BCM2708_CLK_SRC_PLLD;\r\n\t\tmash = BCM2708_CLK_MASH_1;\r\n\r\n\t\tdividend = bcm2708_clk_freq[clk_src];\r\n\t\tdividend <<= BCM2708_CLK_SHIFT;\r\n\t\tdo_div(dividend, target_frequency);\r\n\t\tdivi = dividend >> BCM2708_CLK_SHIFT;\r\n\t\tdivf = dividend & BCM2708_CLK_DIVF_MASK;\r\n\t}\r\n\r\n\t\/* Clock should only be set up here if CPU is clock master *\/\r\n\tif (((dev->fmt & SND_SOC_DAIFMT_MASTER_MASK) == SND_SOC_DAIFMT_CBS_CFS) ||\r\n\t    ((dev->fmt & SND_SOC_DAIFMT_MASTER_MASK) == SND_SOC_DAIFMT_CBS_CFM)) {\r\n\t\t\/* Set clock divider *\/\r\n\t\tregmap_write(dev->clk_regmap, BCM2708_CLK_PCMDIV_REG, BCM2708_CLK_PASSWD\r\n\t\t\t\t| BCM2708_CLK_DIVI(divi)\r\n\t\t\t\t| BCM2708_CLK_DIVF(divf));\r\n\r\n\t\t\/* Setup clock, but don't start it yet *\/\r\n\t\tregmap_write(dev->clk_regmap, BCM2708_CLK_PCMCTL_REG, BCM2708_CLK_PASSWD\r\n\t\t\t\t| BCM2708_CLK_MASH(mash)\r\n\t\t\t\t| BCM2708_CLK_SRC(clk_src));\r\n\t}\r\n\r\n\t\/* Setup the frame format *\/\r\n\tformat = BCM2708_I2S_CHEN;\r\n\r\n\tif (data_length >= 24)\r\n\t\tformat |= BCM2708_I2S_CHWEX;\r\n\r\n\tformat |= BCM2708_I2S_CHWID((data_length-8)&0xf);\r\n\r\n\tswitch (dev->fmt & SND_SOC_DAIFMT_FORMAT_MASK) {\r\n\tcase SND_SOC_DAIFMT_I2S:\r\n\t\tdata_delay = 1;\r\n\t\tbreak;\r\n\tdefault:\r\n\t\t\/*\r\n\t\t * TODO\r\n\t\t * Others are possible but are not implemented at the moment.\r\n\t\t *\/\r\n\t\tdev_err(dev->dev, \"%s:bad format\\n\", __func__);\r\n\t\treturn -EINVAL;\r\n\t}\r\n\r\n\tch1pos = data_delay;\r\n\tch2pos = bclk_ratio \/ 2 + data_delay;\r\n\r\n\tswitch (params_channels(params)) {\r\n\tcase 2:\r\n\t\tformat = BCM2708_I2S_CH1(format) | BCM2708_I2S_CH2(format);\r\n\t\tformat |= BCM2708_I2S_CH1(BCM2708_I2S_CHPOS(ch1pos));\r\n\t\tformat |= BCM2708_I2S_CH2(BCM2708_I2S_CHPOS(ch2pos));\r\n\t\tbreak;\r\n\tdefault:\r\n\t\treturn -EINVAL;\r\n\t}\r\n\r\n\t\/*\r\n\t * Set format for both streams.\r\n\t * We cannot set another frame length\r\n\t * (and therefore word length) anyway,\r\n\t * so the format will be the same.\r\n\t *\/\r\n\tregmap_write(dev->i2s_regmap, BCM2708_I2S_RXC_A_REG, format);\r\n\tregmap_write(dev->i2s_regmap, BCM2708_I2S_TXC_A_REG, format);\r\n\r\n\t\/* Setup the I2S mode *\/\r\n\tmode = 0;\r\n\r\n\tif (data_length <= 16) {\r\n\t\t\/*\r\n\t\t * Use frame packed mode (2 channels per 32 bit word)\r\n\t\t * We cannot set another frame length in the second stream\r\n\t\t * (and therefore word length) anyway,\r\n\t\t * so the format will be the same.\r\n\t\t *\/\r\n\t\tmode |= BCM2708_I2S_FTXP | BCM2708_I2S_FRXP;\r\n\t}\r\n\r\n\tmode |= BCM2708_I2S_FLEN(bclk_ratio - 1);\r\n\tmode |= BCM2708_I2S_FSLEN(bclk_ratio \/ 2);\r\n\r\n\t\/* Master or slave? *\/\r\n\tswitch (dev->fmt & SND_SOC_DAIFMT_MASTER_MASK) {\r\n\tcase SND_SOC_DAIFMT_CBS_CFS:\r\n\t\t\/* CPU is master *\/\r\n\t\tbreak;\r\n\tcase SND_SOC_DAIFMT_CBM_CFS:\r\n\t\t\/*\r\n\t\t * CODEC is bit clock master\r\n\t\t * CPU is frame master\r\n\t\t *\/\r\n\t\tmode |= BCM2708_I2S_CLKM;\r\n\t\tbreak;\r\n\tcase SND_SOC_DAIFMT_CBS_CFM:\r\n\t\t\/*\r\n\t\t * CODEC is frame master\r\n\t\t * CPU is bit clock master\r\n\t\t *\/\r\n\t\tmode |= BCM2708_I2S_FSM;\r\n\t\tbreak;\r\n\tcase SND_SOC_DAIFMT_CBM_CFM:\r\n\t\t\/* CODEC is master *\/\r\n\t\tmode |= BCM2708_I2S_CLKM;\r\n\t\tmode |= BCM2708_I2S_FSM;\r\n\t\tbreak;\r\n\tdefault:\r\n\t\tdev_err(dev->dev, \"%s:bad master\\n\", __func__);\r\n\t\treturn -EINVAL;\r\n\t}\r\n\r\n\t\/*\r\n\t * Invert clocks?\r\n\t *\r\n\t * The BCM approach seems to be inverted to the classical I2S approach.\r\n\t *\/\r\n\tswitch (dev->fmt & SND_SOC_DAIFMT_INV_MASK) {\r\n\tcase SND_SOC_DAIFMT_NB_NF:\r\n\t\t\/* None. Therefore, both for BCM *\/\r\n\t\tmode |= BCM2708_I2S_CLKI;\r\n\t\tmode |= BCM2708_I2S_FSI;\r\n\t\tbreak;\r\n\tcase SND_SOC_DAIFMT_IB_IF:\r\n\t\t\/* Both. Therefore, none for BCM *\/\r\n\t\tbreak;\r\n\tcase SND_SOC_DAIFMT_NB_IF:\r\n\t\t\/*\r\n\t\t * Invert only frame sync. Therefore,\r\n\t\t * invert only bit clock for BCM\r\n\t\t *\/\r\n\t\tmode |= BCM2708_I2S_CLKI;\r\n\t\tbreak;\r\n\tcase SND_SOC_DAIFMT_IB_NF:\r\n\t\t\/*\r\n\t\t * Invert only bit clock. Therefore,\r\n\t\t * invert only frame sync for BCM\r\n\t\t *\/\r\n\t\tmode |= BCM2708_I2S_FSI;\r\n\t\tbreak;\r\n\tdefault:\r\n\t\treturn -EINVAL;\r\n\t}\r\n\r\n\tregmap_write(dev->i2s_regmap, BCM2708_I2S_MODE_A_REG, mode);\r\n\r\n\t\/* Setup the DMA parameters *\/\r\n\tregmap_update_bits(dev->i2s_regmap, BCM2708_I2S_CS_A_REG,\r\n\t\t\tBCM2708_I2S_RXTHR(1)\r\n\t\t\t| BCM2708_I2S_TXTHR(1)\r\n\t\t\t| BCM2708_I2S_DMAEN, 0xffffffff);\r\n\r\n\tregmap_update_bits(dev->i2s_regmap, BCM2708_I2S_DREQ_A_REG,\r\n\t\t\t  BCM2708_I2S_TX_PANIC(0x10)\r\n\t\t\t| BCM2708_I2S_RX_PANIC(0x30)\r\n\t\t\t| BCM2708_I2S_TX(0x30)\r\n\t\t\t| BCM2708_I2S_RX(0x20), 0xffffffff);\r\n\r\n\t\/* Clear FIFOs *\/\r\n\tbcm2708_i2s_clear_fifos(dev, true, true);\r\n\r\n\treturn 0;\r\n}\r\n\r\n<\/code><\/pre>\r\n
\r\n
\r\n\u3053\u306e “bcm2708_i2s_hw_params()” \u95a2\u6570\u306e\u4e2d\u8eab\u3092\u66f8\u304d\u63db\u3048\u308b\u3053\u3068\u3067\u3001I2S\u51fa\u529b\u306eBCK\u306e\u5468\u6ce2\u6570\u3084\u51fa\u529b\u3055\u308c\u308b\u30aa\u30fc\u30c7\u30a3\u30aa\u30c7\u30fc\u30bf\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3082\u5909\u66f4\u3059\u308b\u4e8b\u304c\u53ef\u80fd\u3060\u308d\u3046\uff0e\u56e0\u307f\u306bI2S\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3067\u306fLRCK\u306e\u7acb\u3061\u4e0b\u304c\u308a\u304b\u30891BCK\u5206\u9045\u308c\u3066DATA\u4fe1\u53f7\u304c\u51fa\u529b\u3055\u308c\u308b\u304c\u3001”data_delay = 1;” \u304c\u3053\u306e\u9045\u308c\u3092\u8abf\u6574\u3059\u308b\u5f79\u76ee\u306e\u3088\u3046\u3060\uff0e”data_delay = 0;” \u306b\u3059\u308b\u3068\u3001Left Justified\uff08\u5de6\u8a70\u3081\uff09\u5f62\u5f0f\u3067\u51fa\u529b\u3067\u304d\u308b\u7b48\u3060\uff0e\u540c\u69d8\u306b\u3061\u3087\u3063\u3068\u5de5\u592b\u3059\u308c\u3070PCM1792\u7b49\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\uff08\u6a19\u6e96\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\uff09\u3067\u3042\u308b\u3001Right justified\uff08\u53f3\u8a70\u3081\uff09\u306b\u3082\u5bfe\u5fdc\u53ef\u80fd\u3060\u308d\u3046\uff0e<\/p>\r\n
\r\n
Volumio\u3068\u81ea\u4f5c\u306eDAC\u30b7\u30b9\u30c6\u30e0\u306e\u7d44\u307f\u5408\u308f\u305b\u3067\u3082\u3046\u4e00\u3064\u554f\u984c\u3068\u306a\u308b\u306e\u304c\u3001Volumio\u3067\u306f\u30e1\u30c7\u30a3\u30a2\u30d7\u30ec\u30a4\u30e4\u30fc\u306e\u518d\u751f\u304c\u6b62\u307e\u308b\u3068\u3001LRCK,BCK,DATA \u306e\u4fe1\u53f7\u3082\u4e00\u7dd2\u306b\u505c\u6b62\u3057\u3066\u3057\u307e\u3046\u3053\u3068\u3060\uff0ePCM5102\u306e\u3088\u3046\u306a\u5ec9\u4fa1\u7248\u306eDAC\u3067\u306f\u3042\u307e\u308a\u554f\u984c\u306b\u306a\u3089\u306a\u3044\u306e\u304b\u3082\u3057\u308c\u306a\u3044\u304c\u3001PCM1792\u306e\u69d8\u306a\u3061\u3087\u3063\u3068\u9ad8\u7d1a\u306aDAC\u30c1\u30c3\u30d7\u3067\u306fMCK\u3084BCK, LRCK\u306a\u3069\u306f\u66f2\u304c\u518d\u751f\u3055\u308c\u3066\u3044\u306a\u3044\u9593\u3082\u4f9b\u7d66\u3055\u308c\u7d9a\u3051\u3066\u3044\u308b\u65b9\u304c\u671b\u307e\u3057\u3044\uff0e\u66f2\u306e\u518d\u751f\u304c\u7d42\u308f\u308b\u5ea6\u306b\u3053\u308c\u3089\u306e\u30af\u30ed\u30c3\u30af\u304c\u505c\u6b62\u3059\u308b\u3068\u3001DAC\u30c1\u30c3\u30d7\u306b\u3088\u3063\u3066\u306f\u30ce\u30a4\u30ba\u304c\u767a\u751f\u3057\u305f\u308a\u3001\u5834\u5408\u306b\u3088\u3063\u3066\u306fDAC\u30c1\u30c3\u30d7\u305d\u306e\u3082\u306e\u304c\u30cf\u30f3\u30b0\u30a2\u30c3\u30d7\u3057\u3066\u3057\u307e\u3046\u53ef\u80fd\u6027\u304c\u9ad8\u3044\uff0e”bcm2708-i2s.c”\u306b\u306f\u3001\u30af\u30ed\u30c3\u30af\u3092\u8d77\u52d5\u3057\u305f\u308a\u6b62\u3081\u305f\u308a\u3059\u308b\u95a2\u6570\u3082\u6709\u308b\u3088\u3046\u306a\u306e\u3067\u3001DAC\u306b\u5e38\u306b\u30af\u30ed\u30c3\u30af\u4fe1\u53f7\u304c\u4f9b\u7d66\u3055\u308c\u308b\u3088\u3046\u306b\u6539\u9020\u3059\u308b\u4e8b\u3082\u53ef\u80fd\u304b\u3082\u3057\u308c\u306a\u3044\uff0e<\/p>\r\n
\r\n
Linux\u30ab\u30fc\u30cd\u30eb\u306e\u518d\u69cb\u7bc9\u74b0\u5883\u3092\u6e96\u5099\u3057\u3066\u3001I2S\u30b5\u30a6\u30f3\u30c9\u30c9\u30e9\u30a4\u30d0\u30fc\u3092\u66f8\u304d\u63db\u3048\u308b\u306e\u306f\u7d50\u69cb\u5927\u5909\u305d\u3046\u306a\u306e\u3067\u3001\u4eca\u5ea6\u6642\u9593\u306e\u6709\u308b\u3068\u304d\u306b\u6311\u6226\u3057\u3066\u307f\u3088\u3046\u3068\u601d\u3046\uff0e<\/p>\r\n
\r\n
\r\n
\r\n
\u3010\u8ffd\u8a18\u3011\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u8a8c\u30002015\u5e7412\u6708\u53f7\u3000\u300e\u81ea\u5206\u5c02\u7528Linux X \u30e9\u30ba\u30d1\u30a4\uff65\u30aa\u30fc\u30c7\u30a3\u30aa\u300f<\/h4>\r\n
\r\n
\u4f55\u3068\u30bf\u30a4\u30e0\u30ea\u30fc\u306a\u4e8b\u306b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u8a8c\u306e12\u6708\u53f7\u304c\u30e9\u30ba\u30d9\u30ea\u30fc\u30d1\u30a4\u306e\u30aa\u30fc\u30c7\u30a3\u30aa\u3092\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u3059\u308b\u3068\u3044\u3046\u4e3b\u65e8\u306e\u4f01\u753b\u3092\u7279\u96c6\u3057\u3066\u3044\u305f\u306e\u3067\u3068\u308a\u3042\u3048\u305a\u8cfc\u5165\u3057\u3066\u307f\u305f\uff0e\u307e\u3060\u3001\u3061\u3083\u3093\u3068\u8aad\u3093\u3067\u306f\u3044\u306a\u3044\u304c\u3001\u30c7\u30d0\u30a4\u30b9\u30c9\u30e9\u30a4\u30d0\u306a\u3069\u306e\u6271\u3044\u306a\u3069\u306b\u3082\u89e6\u308c\u3066\u3044\u308b\u3088\u3046\u3060\u304c\u3001\u30c7\u30d0\u30a4\u30b9\u30c9\u30e9\u30a4\u30d0\u5efb\u308a\u306e\u958b\u767a\u306e\u53c2\u8003\u306b\u3059\u308b\u306b\u306f\u3001\u5c11\u3057\u6398\u308a\u4e0b\u3052\u65b9\u304c\u8db3\u308a\u306a\u3044\u304b\u306a\uff0e\uff0e\uff0e<\/p>\r\n
\r\n","protected":false},"excerpt":{"rendered":"\u3000\u3053\u308c\u307e\u3067Raspberry Pi 2\u3068Volumio\u306e\u7d44\u307f\u5408\u308f\u305b\u3067\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30aa\u30fc\u30c7\u30a3\u30aa\u30d7\u30ec\u30a4\u30e4\u30fc\u3092\u5b9f\u73fe\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u7c21\u5358\u306b\u8aac\u660e\u3057\u3066\u304d\u305f\u304c\u3001\u7d44\u307f\u5408\u308f\u305b\u308bDAC\u30e2\u30b8\u30e5\u30fc\u30eb\u306fTI\u306ePCM5102\u3084ESS Technology \u306eES9023\u306a\u3069\u306e\u6bd4\u8f03\u7684\u5b89\u4fa1\u3067\u7c21\u6613\u7684\u306aDAC\u30c1\u30c3\u30d7\u306e\u7d44\u307f\u5408\u308f\u305b\u3060\u3051\u3060\u3063\u305f\u306e\u3067\u3001\u672c\u683c\u7684\u306a\u30aa\u30fc\u30c7\u30a3\u30aa\u7528\u9014\u3068\u3057\u3066\u306f\u5c11\u3057\u7269\u8db3\u308a\u306a\u3044\u3068\u3044\u3046\u611f\u3058\u304c\u3059\u308b\u306e\u3067\u3001\u4eca\u56de\u306f\u3082\u3046\u5c11\u3057\u4e0a\u4f4d\u306eDAC\u30b7\u30b9\u30c6\u30e0\u3068\u7d44\u307f\u5408\u308f\u305b\u308b\u5834\u5408\u306e\u554f\u984c\u70b9\u7b49\u306b\u3064\u3044\u3066\u7d39\u4ecb\u3057\u3088\u3046\u3068\u601d\u3046\uff0e","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[197,713],"tags":[686,685,657,644],"class_list":["post-4667","post","type-post","status-publish","format-standard","hentry","category-d-i-y","category-digital-audio","tag-asrc","tag-pcm1792","tag-raspberry-pi-2","tag-volumio"],"_links":{"self":[{"href":"https:\/\/y2tech.net\/blog\/wp-json\/wp\/v2\/posts\/4667","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/y2tech.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/y2tech.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/y2tech.net\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/y2tech.net\/blog\/wp-json\/wp\/v2\/comments?post=4667"}],"version-history":[{"count":3,"href":"https:\/\/y2tech.net\/blog\/wp-json\/wp\/v2\/posts\/4667\/revisions"}],"predecessor-version":[{"id":4844,"href":"https:\/\/y2tech.net\/blog\/wp-json\/wp\/v2\/posts\/4667\/revisions\/4844"}],"wp:attachment":[{"href":"https:\/\/y2tech.net\/blog\/wp-json\/wp\/v2\/media?parent=4667"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/y2tech.net\/blog\/wp-json\/wp\/v2\/categories?post=4667"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/y2tech.net\/blog\/wp-json\/wp\/v2\/tags?post=4667"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}