{"id":132,"date":"2013-08-30T01:58:07","date_gmt":"2013-08-29T17:58:07","guid":{"rendered":"http:\/\/blog.stlover.org\/?p=132"},"modified":"2013-09-17T05:24:54","modified_gmt":"2013-09-16T21:24:54","slug":"java%e6%a0%a1%e9%9f%b3%e5%99%a8","status":"publish","type":"post","link":"http:\/\/blog.xuhao1.me\/?p=132","title":{"rendered":"Java\u6821\u97f3\u5668\uff1a\u91c7\u96c6\u58f0\u97f3\u4ee5\u53camathematica\u6f14\u793a"},"content":{"rendered":"

\u4e0a\u8282\u6211\u4eec\u8bb2\u4e86\u600e\u4e48\u5199fft\uff0c\u8fd9\u6b21\u6211\u4eec\u6765\u5b9e\u8df5\u4e0bfft\u7684\u5e94\u7528\u3002<\/p>\n

\u524d\u5929\u53c8\u5f00\u59cb\u5531\u4ece\u521d\u4e8c\u5531\u5230\u5927\u4e8c\u7684\u6674\u5929\uff0c\u7531\u4e8e\u957f\u671f\u97f3\u4e0d\u51c6\uff0c\u4e8e\u662f\u5e72\u8106\u501f\u6b64\u505a\u4e00\u4e2a\u7b97\u97f3\u8c03\u7684\u8f6f\u4ef6\u6765\u6821\u51c6\u81ea\u5df1\u7684\u5531\u6b4c\u97f3\u8c03\u3002<\/p>\n

<\/p>\n

\u9996\u5148\uff0c\u662f\u86cb\u75bc\u7684\u4e00\u4e2a\u5de5\u4f5c\uff0c\u8bfb\u5165\u9ea6\u514b\u98ce\u3002\u8fd9\u4e2a\u7740\u5b9e\u8ba9\u6211\u6298\u817e\u5f88\u4e45\uff0c\u4f7f\u7528java.sound\u7684\u63a5\u53e3\uff0c\u7ec8\u4e8e\u5b8c\u6210\u4e86\u91c7\u96c6\u3002<\/p>\n

\u4e00\uff0c\u91c7\u96c6<\/h2>\n

\u5176\u5b9e\u5f88\u7b80\u5355\uff08\u867d\u7136\u641e\u4e86\u4e00\u5929\uff09\uff0c\u6284\u4e86\u6284demo\uff0c\u53d1\u73b0\u53ea\u9700\u8981\u76f4\u63a5\u6355\u6349line\u3002<\/p>\n

    \n
  1. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>TargetDataLine<\/span>\u00a0line<\/span>;<\/span><\/li>\n
  2. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>AudioFormat<\/span>\u00a0format<\/span>;<\/span><\/li>\n
  3. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0format<\/span>=<\/span>new<\/span>\u00a0<\/span>AudioFormat<\/span>(<\/span>AudioFormat<\/span>.<\/span>Encoding<\/span>.<\/span>PCM_SIGNED<\/span>,<\/span>44100<\/span>,<\/span>16<\/span>,<\/span>1<\/span>,(<\/span>16<\/span>\/<\/span>8<\/span>),<\/span>44100<\/span>,<\/span>true<\/span>);\/\/\u5b9a\u58f0\u97f3\u683c\u5f0f\u4e3a44100hz\u91c7\u6837\uff0c\u5355\u901a\u9053<\/span><\/li>\n
  4. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>DataLine<\/span>.<\/span>Info<\/span>\u00a0info\u00a0<\/span>=<\/span>\u00a0<\/span>new<\/span>\u00a0<\/span>DataLine<\/span>.<\/span>Info<\/span>(<\/span>TargetDataLine<\/span>.<\/span>class<\/span>,<\/span>\u00a0<\/span><\/li>\n
  5. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0format<\/span>);<\/span><\/li>\n
  6. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>if<\/span>\u00a0<\/span>(!<\/span>AudioSystem<\/span>.<\/span>isLineSupported<\/span>(<\/span>info<\/span>))<\/span>\u00a0\/\/\u76d1\u6d4b\u662f\u5426\u652f\u6301<\/span><\/li>\n
  7. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>{<\/span><\/li>\n
  8. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>“Line\u00a0matching\u00a0“<\/span>\u00a0<\/span>+<\/span>\u00a0info\u00a0<\/span>+<\/span>\u00a0<\/span>”\u00a0not\u00a0supported.”<\/span>);<\/span><\/li>\n
  9. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>}<\/span><\/li>\n
  10. \u00a0<\/span><\/li>\n
  11. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0line\u00a0<\/span>=<\/span>\u00a0<\/span>(<\/span>TargetDataLine<\/span>)<\/span>\u00a0<\/span>AudioSystem<\/span>.<\/span>getLine<\/span>(<\/span>info<\/span>);\/\/\u6253\u5f00line<\/span><\/li>\n
  12. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0line<\/span>.<\/span>open<\/span>(<\/span>format<\/span>,<\/span>\u00a0line<\/span>.<\/span>getBufferSize<\/span>());<\/span><\/li>\n
  13. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>ByteArrayOutputStream<\/span>\u00a0out\u00a0<\/span>=<\/span>\u00a0<\/span>new<\/span>\u00a0<\/span>ByteArrayOutputStream<\/span>();<\/span><\/li>\n
  14. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>int<\/span>\u00a0frameSizeInBytes\u00a0<\/span>=<\/span>\u00a0format<\/span>.<\/span>getFrameSize<\/span>();<\/span><\/li>\n
  15. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>int<\/span>\u00a0bufferLengthInFrames\u00a0<\/span>=<\/span>\u00a0line<\/span>.<\/span>getBufferSize<\/span>()<\/span>\u00a0<\/span>\/<\/span>\u00a0<\/span>8<\/span>;<\/span><\/li>\n
  16. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>int<\/span>\u00a0bufferLengthInBytes\u00a0<\/span>=<\/span>\u00a0bufferLengthInFrames\u00a0<\/span>*<\/span>\u00a0frameSizeInBytes<\/span>;<\/span><\/li>\n
  17. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>byte<\/span>[]<\/span>\u00a0data\u00a0<\/span>=<\/span>\u00a0<\/span>new<\/span>\u00a0<\/span>byte<\/span>[<\/span>bufferLengthInBytes<\/span>];<\/span><\/li>\n
  18. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>int<\/span>\u00a0numBytesRead<\/span>;<\/span><\/li>\n
  19. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0line<\/span>.<\/span>start<\/span>();\/\/\u6253\u5f00\u8f68\u9053\u91c7\u96c6<\/span><\/li>\n
  20. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>long<\/span>\u00a0st<\/span>,<\/span>tm<\/span>;<\/span><\/li>\n
  21. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0st<\/span>=<\/span>System<\/span>.<\/span>currentTimeMillis<\/span>();<\/span><\/li>\n
  22. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0tm<\/span>=<\/span>st<\/span>;<\/span><\/li>\n
  23. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>\/\/System.out.format(“leninbd:%d\\n”,bufferLengthInBytes);<\/span><\/li>\n
  24. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>“Wait”<\/span>);<\/span><\/li>\n
  25. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>while<\/span>(<\/span>tm<\/span>–<\/span>st<\/span><<\/span>3000<\/span>)<\/span><\/li>\n
  26. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0tm<\/span>=<\/span>System<\/span>.<\/span>currentTimeMillis<\/span>();<\/span><\/li>\n
  27. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>“Run”<\/span>);<\/span><\/li>\n
  28. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0st<\/span>=<\/span>System<\/span>.<\/span>currentTimeMillis<\/span>();\/\/\u4e00\u4e2a\u51c6\u5907\u65f6\u95f4<\/span><\/li>\n
  29. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0tm<\/span>=<\/span>st<\/span>;<\/span><\/li>\n
  30. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>while<\/span>(<\/span>tm<\/span>–<\/span>st<\/span><<\/span>2000<\/span>)\/\/\u8bfb\u4e24\u79d2\u7684\u6570\u636e<\/span><\/li>\n
  31. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>{<\/span><\/li>\n
  32. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>if<\/span>((<\/span>numBytesRead\u00a0<\/span>=<\/span>\u00a0line<\/span>.<\/span>read<\/span>(<\/span>data<\/span>,<\/span>\u00a0<\/span>0<\/span>,<\/span>\u00a0bufferLengthInBytes<\/span>))<\/span>\u00a0<\/span>==<\/span>\u00a0<\/span>–<\/span>1<\/span>)<\/span>\u00a0<\/span><\/li>\n
  33. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>{<\/span><\/li>\n
  34. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>break<\/span>;<\/span><\/li>\n
  35. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>}<\/span><\/li>\n
  36. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0out<\/span>.<\/span>write<\/span>(<\/span>data<\/span>,<\/span>\u00a0<\/span>0<\/span>,<\/span>\u00a0numBytesRead<\/span>);<\/span><\/li>\n
  37. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0tm<\/span>=<\/span>System<\/span>.<\/span>currentTimeMillis<\/span>();<\/span><\/li>\n
  38. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>}<\/span><\/li>\n
  39. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>\/\/System.out.println(“Done”);<\/span><\/li>\n
  40. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0line<\/span>.<\/span>stop<\/span>();<\/span><\/li>\n
  41. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0line<\/span>.<\/span>close<\/span>();<\/span><\/li>\n
  42. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0line\u00a0<\/span>=<\/span>\u00a0<\/span>null<\/span>;<\/span><\/li>\n
  43. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0out<\/span>.<\/span>flush<\/span>();<\/span><\/li>\n
  44. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0out<\/span>.<\/span>close<\/span>();<\/span><\/li>\n
  45. \u00a0\/\/\u5b8c\u6210\u91c7\u96c6<\/span><\/li>\n
  46. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>int<\/span>\u00a0audioint<\/span>[]<\/span>\u00a0<\/span>=<\/span>\u00a0convert<\/span>(<\/span>format<\/span>,<\/span>out<\/span>.<\/span>toByteArray<\/span>());<\/span><\/li>\n
  47. \u00a0 \u00a0 \u00a0 \u00a0 \/\/\u5c06byte\u8f6c\u5316\u4e3aint<\/span><\/li>\n
  48. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>PrintWriter<\/span>\u00a0pw<\/span>=<\/span>new<\/span>\u00a0<\/span>PrintWriter<\/span>(<\/span>new<\/span>\u00a0<\/span>FileWriter<\/span>(<\/span>new<\/span>\u00a0<\/span>File<\/span>(<\/span>“dt.txt”<\/span>)),<\/span>true<\/span>);<\/span><\/li>\n
  49. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>for<\/span>(<\/span>int<\/span>\u00a0i<\/span>=<\/span>0<\/span>;<\/span>i<\/span><<\/span>audioint<\/span>.<\/span>length<\/span>;<\/span>i<\/span>++)<\/span><\/li>\n
  50. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0pw<\/span>.<\/span>format<\/span>(<\/span>“%d\u00a0“<\/span>,<\/span>audioint<\/span>[<\/span>i<\/span>]);<\/span><\/li>\n
  51. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>}<\/span><\/li>\n<\/ol>\n

    \u5176\u4e2d\u8f6c\u5316\u7b97\u6cd5\u5982\u4e0b\uff08\u4e0d\u8981\u95ee\u6211\u4ec0\u4e48\u539f\u7406\uff0c\u8fd9\u79cd\u4e1c\u897f\u6211\u4e00\u822c\u90fd\u6284\u7684\u3002\u3002\u3002\u6ca1\u4ec0\u4e48\u6df1\u5165\u4e86\u89e3\u7684\u610f\u4e49\uff09<\/p>\n

      \n
    1. \u00a0\u00a0\u00a0\u00a0<\/span>int<\/span>\u00a0<\/span>[]<\/span>\u00a0convert<\/span>(<\/span>AudioFormat<\/span>\u00a0format<\/span>,<\/span>byte<\/span>[]<\/span>\u00a0audioBytes<\/span>)<\/span><\/li>\n
    2. \u00a0\u00a0\u00a0\u00a0<\/span>{<\/span><\/li>\n
    3. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>int<\/span>[]<\/span>\u00a0audioData\u00a0<\/span>=<\/span>\u00a0<\/span>null<\/span>;<\/span><\/li>\n
    4. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>if<\/span>\u00a0<\/span>(<\/span>format<\/span>.<\/span>getSampleSizeInBits<\/span>()<\/span>\u00a0<\/span>==<\/span>\u00a0<\/span>16<\/span>)<\/span>\u00a0<\/span><\/li>\n
    5. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>{<\/span><\/li>\n
    6. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>int<\/span>\u00a0nlengthInSamples\u00a0<\/span>=<\/span>\u00a0audioBytes<\/span>.<\/span>length\u00a0<\/span>\/<\/span>\u00a0<\/span>2<\/span>;<\/span><\/li>\n
    7. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0audioData\u00a0<\/span>=<\/span>\u00a0<\/span>new<\/span>\u00a0<\/span>int<\/span>[<\/span>nlengthInSamples<\/span>];<\/span><\/li>\n
    8. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>if<\/span>\u00a0<\/span>(<\/span>format<\/span>.<\/span>isBigEndian<\/span>())<\/span>\u00a0<\/span><\/li>\n
    9. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>{<\/span><\/li>\n
    10. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>for<\/span>\u00a0<\/span>(<\/span>int<\/span>\u00a0i\u00a0<\/span>=<\/span>\u00a0<\/span>0<\/span>;<\/span>\u00a0i\u00a0<\/span><<\/span>\u00a0nlengthInSamples<\/span>;<\/span>\u00a0i<\/span>++)<\/span>\u00a0<\/span><\/li>\n
    11. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>{<\/span><\/li>\n
    12. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>\/*\u00a0First\u00a0byte\u00a0is\u00a0MSB\u00a0(high\u00a0order)\u00a0*\/<\/span><\/li>\n
    13. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>int<\/span>\u00a0MSB\u00a0<\/span>=<\/span>\u00a0<\/span>(<\/span>int<\/span>)<\/span>\u00a0audioBytes<\/span>[<\/span>2<\/span>*<\/span>i<\/span>];<\/span><\/li>\n
    14. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>\/*\u00a0Second\u00a0byte\u00a0is\u00a0LSB\u00a0(low\u00a0order)\u00a0*\/<\/span><\/li>\n
    15. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>int<\/span>\u00a0LSB\u00a0<\/span>=<\/span>\u00a0<\/span>(<\/span>int<\/span>)<\/span>\u00a0audioBytes<\/span>[<\/span>2<\/span>*<\/span>i<\/span>+<\/span>1<\/span>];<\/span><\/li>\n
    16. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0audioData<\/span>[<\/span>i<\/span>]<\/span>\u00a0<\/span>=<\/span>\u00a0MSB\u00a0<\/span><<<\/span>\u00a0<\/span>8<\/span>\u00a0<\/span>|<\/span>\u00a0<\/span>(<\/span>255<\/span>\u00a0<\/span>><\/span>\u00a0LSB<\/span>);<\/span><\/li>\n
    17. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>}<\/span><\/li>\n
    18. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>}<\/span>\u00a0<\/span><\/li>\n
    19. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>else<\/span>\u00a0<\/span><\/li>\n
    20. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>{<\/span><\/li>\n
    21. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>for<\/span>\u00a0<\/span>(<\/span>int<\/span>\u00a0i\u00a0<\/span>=<\/span>\u00a0<\/span>0<\/span>;<\/span>\u00a0i\u00a0<\/span><<\/span>\u00a0nlengthInSamples<\/span>;<\/span>\u00a0i<\/span>++)<\/span>\u00a0<\/span><\/li>\n
    22. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>{<\/span><\/li>\n
    23. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>\/*\u00a0First\u00a0byte\u00a0is\u00a0LSB\u00a0(low\u00a0order)\u00a0*\/<\/span><\/li>\n
    24. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>int<\/span>\u00a0LSB\u00a0<\/span>=<\/span>\u00a0<\/span>(<\/span>int<\/span>)<\/span>\u00a0audioBytes<\/span>[<\/span>2<\/span>*<\/span>i<\/span>];<\/span><\/li>\n
    25. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>\/*\u00a0Second\u00a0byte\u00a0is\u00a0MSB\u00a0(high\u00a0order)\u00a0*\/<\/span><\/li>\n
    26. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>int<\/span>\u00a0MSB\u00a0<\/span>=<\/span>\u00a0<\/span>(<\/span>int<\/span>)<\/span>\u00a0audioBytes<\/span>[<\/span>2<\/span>*<\/span>i<\/span>+<\/span>1<\/span>];<\/span><\/li>\n
    27. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0audioData<\/span>[<\/span>i<\/span>]<\/span>\u00a0<\/span>=<\/span>\u00a0MSB\u00a0<\/span><<<\/span>\u00a0<\/span>8<\/span>\u00a0<\/span>|<\/span>\u00a0<\/span>(<\/span>255<\/span>\u00a0<\/span>><\/span>\u00a0LSB<\/span>);<\/span><\/li>\n
    28. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>}<\/span><\/li>\n
    29. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>}<\/span><\/li>\n
    30. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>}<\/span>\u00a0<\/span><\/li>\n
    31. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>else<\/span>\u00a0<\/span>if<\/span>\u00a0<\/span>(<\/span>format<\/span>.<\/span>getSampleSizeInBits<\/span>()<\/span>\u00a0<\/span>==<\/span>\u00a0<\/span>8<\/span>)<\/span>\u00a0<\/span><\/li>\n
    32. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>{<\/span><\/li>\n
    33. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>int<\/span>\u00a0nlengthInSamples\u00a0<\/span>=<\/span>\u00a0audioBytes<\/span>.<\/span>length<\/span>;<\/span><\/li>\n
    34. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0audioData\u00a0<\/span>=<\/span>\u00a0<\/span>new<\/span>\u00a0<\/span>int<\/span>[<\/span>nlengthInSamples<\/span>];<\/span><\/li>\n
    35. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>if<\/span>\u00a0<\/span>(<\/span>format<\/span>.<\/span>getEncoding<\/span>().<\/span>toString<\/span>().<\/span>startsWith<\/span>(<\/span>“PCM_SIGN”<\/span>))<\/span>\u00a0<\/span><\/li>\n
    36. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>{<\/span><\/li>\n
    37. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>for<\/span>\u00a0<\/span>(<\/span>int<\/span>\u00a0i\u00a0<\/span>=<\/span>\u00a0<\/span>0<\/span>;<\/span>\u00a0i\u00a0<\/span><<\/span>\u00a0audioBytes<\/span>.<\/span>length<\/span>;<\/span>\u00a0i<\/span>++)<\/span>\u00a0<\/span><\/li>\n
    38. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>{<\/span><\/li>\n
    39. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0audioData<\/span>[<\/span>i<\/span>]<\/span>\u00a0<\/span>=<\/span>\u00a0audioBytes<\/span>[<\/span>i<\/span>];<\/span><\/li>\n
    40. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>}<\/span><\/li>\n
    41. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>}<\/span>\u00a0<\/span><\/li>\n
    42. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>else<\/span>\u00a0<\/span><\/li>\n
    43. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>{<\/span><\/li>\n
    44. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>for<\/span>\u00a0<\/span>(<\/span>int<\/span>\u00a0i\u00a0<\/span>=<\/span>\u00a0<\/span>0<\/span>;<\/span>\u00a0i\u00a0<\/span><<\/span>\u00a0audioBytes<\/span>.<\/span>length<\/span>;<\/span>\u00a0i<\/span>++)<\/span>\u00a0<\/span><\/li>\n
    45. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>{<\/span><\/li>\n
    46. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0audioData<\/span>[<\/span>i<\/span>]<\/span>\u00a0<\/span>=<\/span>\u00a0audioBytes<\/span>[<\/span>i<\/span>]<\/span>\u00a0<\/span>–<\/span>\u00a0<\/span>128<\/span>;<\/span><\/li>\n
    47. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>}<\/span><\/li>\n
    48. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>}<\/span><\/li>\n
    49. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>}<\/span><\/li>\n
    50. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>return<\/span>\u00a0audioData<\/span>;<\/span><\/li>\n
    51. \u00a0\u00a0\u00a0\u00a0<\/span>}<\/span><\/li>\n<\/ol>\n

      \u4e8e\u662f\u5c31\u5b8c\u6210\u4e86\u58f0\u97f3\u7684\u57fa\u7840\u91c7\u96c6\uff0c\u62ff\u53bb\u653e\u5230mathematica\u6d4b\u8bd5\uff0c\u7528\u5409\u4ed6\u5f39\u51e0\u4e2a\u97f3\u561b<\/p>\n

        \n
      1. (*<\/span>Mathematica<\/span>\u00a0<\/span>Code<\/span>*)<\/span><\/li>\n
      2. Init<\/span>[]<\/span>\u00a0<\/span>:=<\/span><\/li>\n
      3. \u00a0<\/span>(<\/span>dt\u00a0<\/span>=<\/span>\u00a0<\/span><\/li>\n
      4. \u00a0\u00a0\u00a0<\/span>Import<\/span>[<\/span>“\/Users\/none\/Develop\/mph\/build\/dt.txt”<\/span>,<\/span>\u00a0<\/span>“Table”<\/span>][[<\/span>1<\/span>]];<\/span><\/li>\n
      5. \u00a0\u00a0<\/span>ListLinePlot<\/span>[<\/span>dt<\/span>,<\/span>\u00a0<\/span>PlotRange<\/span>\u00a0<\/span>-><\/span>\u00a0<\/span>All<\/span>])<\/span><\/li>\n
      6. \u00a0<\/span><\/li>\n
      7. Anal<\/span>\u00a0<\/span>:=<\/span>\u00a0<\/span>(<\/span><\/li>\n
      8. \u00a0\u00a0<\/span>(*<\/span>dt<\/span>=<\/span>SignalMk<\/span>[<\/span>1<\/span>,<\/span>263<\/span>];*)<\/span><\/li>\n
      9. \u00a0\u00a0ts\u00a0<\/span>=<\/span>\u00a0<\/span>Length<\/span>[<\/span>dt<\/span>]\/<\/span>44100<\/span>;<\/span><\/li>\n
      10. \u00a0\u00a0dr\u00a0<\/span>=<\/span>\u00a0<\/span>1000<\/span>;<\/span><\/li>\n
      11. \u00a0\u00a0<\/span>ListLinePlot<\/span>[<\/span><\/li>\n
      12. \u00a0\u00a0\u00a0\u00a0<\/span>Abs<\/span>[<\/span>\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/li>\n
      13. \u00a0\u00a0\u00a0\u00a0\u00a0<\/span>Fourier<\/span>[<\/span>dt<\/span>[[<\/span>100<\/span>\u00a0<\/span>;;<\/span>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>Length<\/span>[<\/span>dt<\/span>]<\/span>\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>]]<\/span>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>][[<\/span>1<\/span>\u00a0<\/span>;;<\/span>\u00a0<\/span><\/li>\n
      14. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>Round<\/span>[<\/span>dr<\/span>*<\/span>ts<\/span>]<\/span>\u00a0<\/span>]]],<\/span><\/li>\n
      15. \u00a0\u00a0\u00a0\u00a0<\/span>PlotRange<\/span>\u00a0<\/span>-><\/span>\u00a0<\/span>All<\/span><\/li>\n
      16. \u00a0\u00a0\u00a0\u00a0<\/span>,<\/span>\u00a0<\/span>DataRange<\/span>\u00a0<\/span>-><\/span>\u00a0<\/span>{<\/span>1<\/span>,<\/span>\u00a0dr<\/span>*<\/span>ts<\/span>}*<\/span>1<\/span>\/<\/span>ts<\/span>]<\/span><\/li>\n
      17. \u00a0\u00a0\u00a0<\/span>1<\/span><\/li>\n
      18. \u00a0\u00a0<\/span>)<\/span><\/li>\n<\/ol>\n

        \u5206\u6790\u4e0b\u5f97\u5230\u4e24\u4e2a\u56fe<\/p>\n

        \"analse\"<\/a><\/p>\n

         <\/p>\n

        \uff08\u5176\u5b9e\u662f\u6674\u5929\u7684\u7b2c\u4e00\u4e2a\u5c0f\u7ed3\u5566\uff09<\/p>\n

        \"analse2\"<\/a><\/p>\n

         <\/p>\n

        \u9891\u8c31\u51e0\u4e4e\u6b63\u786e\uff0c\u867d\u7136\u4e0d\u77e5\u9053200hz\u54ea\u6765\u7684\u97f3\u554a\u3002\u3002\u3002\u3002\u3002<\/p>\n

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

        \u4e0a\u8282\u6211\u4eec\u8bb2\u4e86\u600e\u4e48\u5199fft\uff0c\u8fd9\u6b21\u6211\u4eec\u6765\u5b9e\u8df5\u4e0bfft\u7684\u5e94\u7528\u3002 \u524d\u5929\u53c8\u5f00\u59cb\u5531\u4ece\u521d\u4e8c\u5531\u5230\u5927\u4e8c\u7684\u6674\u5929\uff0c\u7531\u4e8e\u957f\u671f\u97f3\u4e0d\u51c6\uff0c\u4e8e … <\/p>\n

        \u7ee7\u7eed\u9605\u8bfb\u201cJava\u6821\u97f3\u5668\uff1a\u91c7\u96c6\u58f0\u97f3\u4ee5\u53camathematica\u6f14\u793a\u201d<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"_links":{"self":[{"href":"http:\/\/blog.xuhao1.me\/index.php?rest_route=\/wp\/v2\/posts\/132"}],"collection":[{"href":"http:\/\/blog.xuhao1.me\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/blog.xuhao1.me\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/blog.xuhao1.me\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/blog.xuhao1.me\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=132"}],"version-history":[{"count":4,"href":"http:\/\/blog.xuhao1.me\/index.php?rest_route=\/wp\/v2\/posts\/132\/revisions"}],"predecessor-version":[{"id":164,"href":"http:\/\/blog.xuhao1.me\/index.php?rest_route=\/wp\/v2\/posts\/132\/revisions\/164"}],"wp:attachment":[{"href":"http:\/\/blog.xuhao1.me\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=132"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/blog.xuhao1.me\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=132"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/blog.xuhao1.me\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=132"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}