{"id":264436,"date":"2024-05-15T15:37:36","date_gmt":"2024-05-15T07:37:36","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/264436.html"},"modified":"2024-05-15T15:37:41","modified_gmt":"2024-05-15T07:37:41","slug":"%e6%9c%89%e5%93%aa%e4%ba%9b%e5%b8%b8%e8%a7%81%e7%9a%84-dsp-%e4%bb%a3%e7%a0%81%e6%8a%80%e6%9c%af%e6%88%96%e7%ae%97%e6%b3%95","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/264436.html","title":{"rendered":"\u6709\u54ea\u4e9b\u5e38\u89c1\u7684 dsp \u4ee3\u7801\u6280\u672f\u6216\u7b97\u6cd5"},"content":{"rendered":"

\"\u6709\u54ea\u4e9b\u5e38\u89c1\u7684<\/p>\n

\u6570\u5b57\u4fe1\u53f7\u5904\u7406(DSP)\u662f\u4e00\u95e8\u7ed3\u5408\u6570\u5b66\u3001\u4fe1\u53f7\u7406\u8bba\u4e0e\u8ba1\u7b97\u6280\u672f\u7684\u79d1\u5b66\uff0c\u5b83\u6d89\u53ca\u5230\u4e00\u7cfb\u5217\u8ba1\u7b97\u548c\u5904\u7406\u6570\u5b57\u5316\u4fe1\u53f7\u7684\u6280\u672f\u548c\u7b97\u6cd5\u3002\u5e38\u89c1\u7684DSP\u4ee3\u7801\u6280\u672f\u6216\u7b97\u6cd5\u5305\u62ec\u5feb\u901f\u5085\u91cc\u53f6\u53d8\u6362(FFT)\u3001\u6ee4\u6ce2\u5668\u8bbe\u8ba1\u3001\u81ea\u9002\u5e94\u6ee4\u6ce2\u3001\u79bb\u6563\u4f59\u5f26\u53d8\u6362(DCT)\u3001\u591a\u901f\u7387\u4fe1\u53f7\u5904\u7406\u3001\u6ce2\u5f62\u7f16\u7801<\/strong>\u7b49\u3002\u5176\u4e2d\uff0c\u5feb\u901f\u5085\u91cc\u53f6\u53d8\u6362<\/strong>\u662f\u6700\u6838\u5fc3\u7684\u6280\u672f\u4e4b\u4e00\uff0c\u5b83\u80fd\u5c06\u65f6\u57df\u4fe1\u53f7\u8f6c\u6362\u4e3a\u9891\u57df\u4fe1\u53f7\uff0c\u4f7f\u6211\u4eec\u80fd\u591f\u5206\u6790\u4fe1\u53f7\u7684\u9891\u8c31\u7279\u6027\uff0c\u5e76\u5728\u6b64\u57fa\u7840\u4e0a\u8fdb\u884c\u5404\u79cd\u6ee4\u6ce2\u3001\u8c03\u5236\u3001\u538b\u7f29\u7b49\u5904\u7406\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u5feb\u901f\u5085\u91cc\u53f6\u53d8\u6362(FFT)<\/h3>\n<\/p>\n

\u5feb\u901f\u5085\u91cc\u53f6\u53d8\u6362\u662f\u5904\u7406\u6570\u5b57\u4fe1\u53f7\u4e2d\u6700\u5e38\u7528\u7684\u7b97\u6cd5\u4e4b\u4e00\uff0c\u5b83\u80fd\u6709\u6548\u5730\u8ba1\u7b97\u79bb\u6563\u5085\u91cc\u53f6\u53d8\u6362\uff08DFT\uff09\u3002FFT\u7b97\u6cd5\u80fd\u5927\u5e45\u964d\u4f4e\u8fd0\u7b97\u590d\u6742\u5ea6\uff0c\u4f7f\u5206\u6790\u9891\u57df\u6210\u4e3a\u53ef\u80fd\u3002<\/p>\n<\/p>\n

\u4f20\u7edf\u7684DFT\u590d\u6742\u5ea6\u4e3aO(N^2)\uff0c\u800cFFT\u53ef\u4ee5\u5c06\u8fd9\u4e00\u590d\u6742\u5ea6\u964d\u4f4e\u5230O(NlogN)\u3002\u8fd9\u4e00\u7279\u70b9\u4f7f\u5f97FFT\u5728\u5b9e\u65f6\u4fe1\u53f7\u5904\u7406\u548c\u5927\u89c4\u6a21\u4fe1\u53f7\u5904\u7406\u4e2d\u53d8\u5f97\u6781\u4e3a\u91cd\u8981\u3002FFT\u4e0d\u4ec5\u7528\u4e8e\u4fe1\u53f7\u7684\u9891\u8c31\u5206\u6790\uff0c\u8fd8\u5e7f\u6cdb\u5e94\u7528\u4e8e\u8bed\u97f3\u5904\u7406\u3001\u56fe\u50cf\u5904\u7406\u7b49\u9886\u57df\u3002<\/p>\n<\/p>\n

\u4e8c\u3001\u6ee4\u6ce2\u5668\u8bbe\u8ba1<\/h3>\n<\/p>\n

\u6ee4\u6ce2\u5668\u5728DSP\u4e2d\u626e\u6f14\u7740\u81f3\u5173\u91cd\u8981\u7684\u89d2\u8272\u3002\u8bbe\u8ba1\u4e00\u4e2a\u597d\u7684\u6ee4\u6ce2\u5668\u610f\u5473\u7740\u80fd\u591f\u53bb\u9664\u4e0d\u5fc5\u8981\u7684\u4fe1\u53f7\u6210\u5206\uff0c\u4f8b\u5982\u566a\u58f0\uff0c\u6216\u8005\u662f\u4ece\u590d\u6742\u4fe1\u53f7\u4e2d\u63d0\u53d6\u51fa\u6709\u7528\u4fe1\u606f\u3002<\/p>\n<\/p>\n

\u6ee4\u6ce2\u5668\u8bbe\u8ba1\u5305\u62ec\u6a21\u62df\u6ee4\u6ce2\u5668\u548c\u6570\u5b57\u6ee4\u6ce2\u5668\u8bbe\u8ba1\u3002\u6570\u5b57\u6ee4\u6ce2\u5668\u901a\u5e38\u7528\u5230\u7684\u8bbe\u8ba1\u65b9\u6cd5\u6709\u7a97\u51fd\u6570\u6cd5\u3001\u9891\u7387\u91c7\u6837\u6cd5\u548c\u6700\u4f18\u903c\u8fd1\u6cd5\uff08\u5982\u5207\u6bd4\u96ea\u592b\u3001\u692d\u5706\u7b49\uff09\u3002\u5728DSP\u4ee3\u7801\u5b9e\u73b0\u4e2d\uff0cFIR (\u6709\u9650\u8109\u51b2\u54cd\u5e94) \u548cIIR (\u65e0\u9650\u8109\u51b2\u54cd\u5e94) \u6ee4\u6ce2\u5668<\/strong>\u662f\u4e24\u79cd\u57fa\u672c\u5f62\u5f0f\u3002FIR\u6ee4\u6ce2\u5668\u5177\u6709\u7ebf\u6027\u76f8\u4f4d\u7279\u6027\uff0c\u6613\u4e8e\u8bbe\u8ba1\u548c\u5b9e\u73b0\uff1b\u800cIIR\u6ee4\u6ce2\u5668\u5177\u6709\u8f83\u4f4e\u7684\u8ba1\u7b97\u590d\u6742\u5ea6\u3002<\/p>\n<\/p>\n

\u4e09\u3001\u81ea\u9002\u5e94\u6ee4\u6ce2<\/h3>\n<\/p>\n

\u81ea\u9002\u5e94\u6ee4\u6ce2\u662fDSP\u4e2d\u4e00\u79cd\u7279\u6b8a\u7c7b\u578b\u7684\u6ee4\u6ce2\u5668\uff0c\u5b83\u80fd\u591f\u6839\u636e\u4fe1\u53f7\u7684\u7edf\u8ba1\u7279\u6027\u81ea\u52a8\u8c03\u6574\u5176\u53c2\u6570\u3002\u81ea\u9002\u5e94\u6ee4\u6ce2\u4e3b\u8981\u7528\u4e8e\u56de\u58f0\u6d88\u9664\u3001\u4fe1\u9053\u5747\u8861\u548c\u566a\u58f0\u6291\u5236\u7b49\u9886\u57df\u3002<\/p>\n<\/p>\n

\u5176\u4e2d\u6700\u5e38\u89c1\u7684\u7b97\u6cd5\u5305\u62ecLMS\uff08\u6700\u5c0f\u5747\u65b9\uff09\u7b97\u6cd5\u548cRLS\uff08\u9012\u5f52\u6700\u5c0f\u4e8c\u4e58\uff09\u7b97\u6cd5\u3002LMS\u7b97\u6cd5\u7b80\u5355\u3001\u6613\u4e8e\u5b9e\u73b0<\/strong>\uff0c\u4f46\u5176\u6536\u655b\u901f\u5ea6\u76f8\u5bf9\u8f83\u6162\uff1b\u800cRLS\u7b97\u6cd5\u6536\u655b\u901f\u5ea6\u5feb\uff0c\u4f46\u8ba1\u7b97\u590d\u6742\u5ea6\u9ad8\uff0c\u4e0d\u9002\u5408\u5b9e\u65f6\u5904\u7406\u3002<\/p>\n<\/p>\n

\u56db\u3001\u79bb\u6563\u4f59\u5f26\u53d8\u6362(DCT)<\/h3>\n<\/p>\n

\u79bb\u6563\u4f59\u5f26\u53d8\u6362\u662f\u4e00\u79cd\u4e0eFFT\u7c7b\u4f3c\u7684\u53d8\u6362\uff0c\u5b83\u4e3b\u8981\u7528\u4e8e\u4fe1\u53f7\u548c\u56fe\u50cf\u7684\u538b\u7f29\u3002DCT\u80fd\u591f\u5c06\u4fe1\u53f7\u7684\u80fd\u91cf\u96c6\u4e2d\u5728\u53d8\u6362\u7cfb\u6570\u7684\u524d\u51e0\u4e2a\u4e0a\uff0c\u8fd9\u4e00\u7279\u6027\u88ab\u5e7f\u6cdb\u5e94\u7528\u4e8eJPEG\u56fe\u7247\u538b\u7f29\u548cMPEG\u89c6\u9891\u538b\u7f29\u4e2d\u3002<\/p>\n<\/p>\n

DCT\u7684\u76ee\u7684\u662f\u51cf\u5c11\u6216\u6d88\u9664\u4fe1\u53f7\u4e2d\u7684\u5197\u4f59\u4fe1\u606f\uff0c\u4ece\u800c\u8fbe\u5230\u538b\u7f29\u7684\u76ee\u7684\u3002\u5728\u6267\u884cDCT\u4e4b\u540e\uff0c\u53ef\u4ee5\u901a\u8fc7\u91cf\u5316\u548c\u7f16\u7801\u5904\u7406<\/strong>\u8fdb\u4e00\u6b65\u538b\u7f29\u4fe1\u53f7\u3002<\/p>\n<\/p>\n

\u4e94\u3001\u591a\u901f\u7387\u4fe1\u53f7\u5904\u7406<\/h3>\n<\/p>\n

\u591a\u901f\u7387\u4fe1\u53f7\u5904\u7406\u6280\u672f\u5305\u62ec\u62bd\u6837\u3001\u63d2\u503c\u548c\u591a\u7ea7\u6ee4\u6ce2\u5668\u7ec4\u7684\u6982\u5ff5\u3002\u5728DSP\u7cfb\u7edf\u4e2d\uff0c\u7ecf\u5e38\u9700\u8981\u5bf9\u4fe1\u53f7\u8fdb\u884c\u91c7\u6837\u7387\u7684\u53d8\u6362\uff0c\u8fd9\u65f6\u5019\u591a\u901f\u7387\u6280\u672f\u5c31\u663e\u5f97\u5c24\u4e3a\u91cd\u8981\u3002<\/p>\n<\/p>\n

\u8fd9\u79cd\u6280\u672f\u53ef\u4ee5\u6709\u6548\u51cf\u5c11\u8ba1\u7b97\u91cf\uff0c\u4f18\u5316\u7cfb\u7edf\u6027\u80fd\u3002\u4f8b\u5982\uff0c\u5728\u6570\u5b57\u97f3\u9891\u64ad\u653e\u5668\u4e2d\uff0c\u7ecf\u5e38\u9700\u8981\u5bf9\u97f3\u9891\u4fe1\u53f7\u8fdb\u884c\u4e0a\u91c7\u6837\u6216\u4e0b\u91c7\u6837\u6765\u914d\u5408\u4e0d\u540c\u7684\u64ad\u653e\u901f\u7387\u9700\u6c42\u3002\u591a\u76f8\u6ee4\u6ce2\u5668\u7ed3\u6784<\/strong>\u662f\u591a\u901f\u7387\u4fe1\u53f7\u5904\u7406\u4e2d\u4e00\u4e2a\u91cd\u8981\u7684\u6982\u5ff5\uff0c\u5b83\u53ef\u4ee5\u6709\u6548\u5730\u5b9e\u73b0\u8fd9\u4e9b\u64cd\u4f5c\u3002<\/p>\n<\/p>\n

\u516d\u3001\u6ce2\u5f62\u7f16\u7801<\/h3>\n<\/p>\n

\u6ce2\u5f62\u7f16\u7801\u662f\u4e00\u79cd\u4fe1\u53f7\u538b\u7f29\u6280\u672f\uff0c\u5b83\u76f4\u63a5\u5bf9\u4fe1\u53f7\u7684\u6ce2\u5f62\u8fdb\u884c\u7f16\u7801\u3002\u5e38\u89c1\u7684\u6ce2\u5f62\u7f16\u7801\u6280\u672f\u6709\u8109\u51b2\u7f16\u7801\u8c03\u5236(PCM)\u3001\u5dee\u5206\u8109\u51b2\u7f16\u7801\u8c03\u5236(DPCM)\u548c\u81ea\u9002\u5e94\u5dee\u5206\u8109\u51b2\u7f16\u7801\u8c03\u5236(ADPCM)\u7b49\u3002<\/p>\n<\/p>\n

\u5728\u8fd9\u4e9b\u6280\u672f\u4e2d\uff0c\u8109\u51b2\u7f16\u7801\u8c03\u5236\u662f\u6700\u57fa\u7840\u7684\u7f16\u7801\u65b9\u5f0f<\/strong>\uff0c\u5b83\u901a\u8fc7\u5bf9\u6a21\u62df\u4fe1\u53f7\u7684\u7b49\u95f4\u9694\u91c7\u6837\u4e0e\u91cf\u5316\u5c06\u6a21\u62df\u4fe1\u53f7\u8f6c\u5316\u4e3a\u6570\u5b57\u4fe1\u53f7\u3002PCM\u7f16\u7801\u6280\u672f\u662f\u6570\u5b57\u7535\u8bdd\u901a\u4fe1\u53caCD\u97f3\u8d28\u7684\u57fa\u7840\u3002<\/p>\n<\/p>\n

\u7ed3\u8bed<\/h3>\n<\/p>\n

\u6570\u5b57\u4fe1\u53f7\u5904\u7406\u6280\u672f\u662f\u73b0\u4ee3\u901a\u4fe1\u3001\u591a\u5a92\u4f53\u5904\u7406\u4e2d\u4e0d\u53ef\u6216\u7f3a\u7684\u4e00\u73af\u3002\u4ee5\u4e0a\u4ecb\u7ecd\u7684\u6280\u672f\u4e0e\u7b97\u6cd5\u662f\u8be5\u9886\u57df\u4e2d\u7684\u5173\u952e\u90e8\u5206\uff0c\u4ed6\u4eec\u7684\u5e94\u7528\u8303\u56f4\u5e7f\u6cdb\uff0c\u5bf9\u4e8e\u63a8\u8fdb\u6280\u672f\u53d1\u5c55\u8d77\u7740\u81f3\u5173\u91cd\u8981\u7684\u4f5c\u7528\u3002\u638c\u63e1\u5e76\u59a5\u5584\u5e94\u7528\u8fd9\u4e9bDSP\u6280\u672f\u548c\u7b97\u6cd5\uff0c\u5bf9\u4e8e\u4efb\u4f55\u4e00\u4e2a\u5e0c\u671b\u7cbe\u901a\u6570\u5b57\u4fe1\u53f7\u5904\u7406\u7684\u4e13\u4e1a\u4eba\u5458\u6765\u8bf4\u90fd\u662f\u57fa\u672c\u8981\u6c42\u3002\u968f\u7740\u8ba1\u7b97\u80fd\u529b\u7684\u63d0\u9ad8\u53ca\u7b97\u6cd5\u7684\u4e0d\u65ad\u4f18\u5316\uff0cDSP\u6280\u672f\u5c06\u7ee7\u7eed\u5728\u4f17\u591a\u9886\u57df\u5c55\u73b0\u5176\u91cd\u8981\u4ef7\u503c\u3002<\/p>\n<\/p>\n

\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n

1. DSP\u4ee3\u7801\u6280\u672f\uff1a\u5982\u4f55\u9009\u62e9\u5408\u9002\u7684\u6ee4\u6ce2\u5668\u7b97\u6cd5\uff1f<\/strong><\/p>\n

\u6ee4\u6ce2\u5668\u7b97\u6cd5\u5728\u6570\u5b57\u4fe1\u53f7\u5904\u7406\u4e2d\u8d77\u7740\u81f3\u5173\u91cd\u8981\u7684\u4f5c\u7528\u3002\u5e38\u89c1\u7684\u6ee4\u6ce2\u5668\u7b97\u6cd5\u5305\u62ecIIR\uff08Infinite Impulse Response\uff09\u548cFIR\uff08Finite Impulse Response\uff09\u7b49\u3002\u8981\u9009\u62e9\u5408\u9002\u7684\u6ee4\u6ce2\u5668\u7b97\u6cd5\uff0c\u9700\u8981\u8003\u8651\u4e00\u7cfb\u5217\u56e0\u7d20\uff0c\u5982\u6ee4\u6ce2\u5668\u7684\u9891\u7387\u54cd\u5e94\u8981\u6c42\u3001\u8ba1\u7b97\u590d\u6742\u5ea6\u3001\u5ef6\u8fdf\u7b49\u3002\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u5982\u679c\u5bf9\u5ef6\u8fdf\u8981\u6c42\u8f83\u9ad8\uff0c\u53ef\u4ee5\u9009\u62e9FIR\u6ee4\u6ce2\u5668\uff1b\u800c\u5982\u679c\u5bf9\u9891\u7387\u54cd\u5e94\u8981\u6c42\u8f83\u9ad8\uff0c\u53ef\u4ee5\u9009\u62e9IIR\u6ee4\u6ce2\u5668\u3002\u9664\u6b64\u4e4b\u5916\uff0c\u8fd8\u53ef\u4ee5\u6839\u636e\u5177\u4f53\u5e94\u7528\u573a\u666f\u7684\u7279\u70b9\u8fdb\u884c\u7b97\u6cd5\u9009\u62e9\u3002<\/p>\n

2. DSP\u4ee3\u7801\u6280\u672f\uff1a\u5982\u4f55\u8fdb\u884c\u58f0\u97f3\u4fe1\u53f7\u7684\u538b\u7f29\u548c\u89e3\u538b\u7f29\uff1f<\/strong><\/p>\n

\u58f0\u97f3\u4fe1\u53f7\u7684\u538b\u7f29\u548c\u89e3\u538b\u7f29\u5bf9\u4e8e\u97f3\u9891\u5904\u7406\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u5e38\u89c1\u7684\u538b\u7f29\u7b97\u6cd5\u5305\u62ecMP3\u3001AAC\u3001FLAC\u7b49\u3002\u8fd9\u4e9b\u7b97\u6cd5\u901a\u8fc7\u91c7\u7528\u4e0d\u540c\u7684\u7f16\u7801\u65b9\u5f0f\uff0c\u5c06\u97f3\u9891\u4fe1\u53f7\u7684\u5197\u4f59\u4fe1\u606f\u538b\u7f29\u6389\uff0c\u4ece\u800c\u51cf\u5c0f\u6587\u4ef6\u5927\u5c0f\u3002\u5728\u89e3\u538b\u7f29\u65f6\uff0c\u9700\u8981\u4f7f\u7528\u76f8\u5e94\u7684\u89e3\u7801\u7b97\u6cd5\u5c06\u538b\u7f29\u540e\u7684\u6570\u636e\u6062\u590d\u6210\u539f\u59cb\u7684\u97f3\u9891\u4fe1\u53f7\u3002\u9009\u62e9\u4f55\u79cd\u538b\u7f29\u7b97\u6cd5\uff0c\u9700\u6839\u636e\u97f3\u9891\u8d28\u91cf\u8981\u6c42\u3001\u538b\u7f29\u6bd4\u8981\u6c42\u7b49\u56e0\u7d20\u7efc\u5408\u8003\u8651\u3002<\/p>\n

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