\u3000\u3000\u65f6\u57df\u548c\u9891\u57df\u662f\u4fe1\u53f7\u5904\u7406\u4e2d\u5e38\u7528\u7684\u4e24\u79cd\u8868\u793a\u65b9\u6cd5\u3002\u65f6\u57df\u8868\u793a\u4fe1\u53f7\u968f\u65f6\u95f4\u7684\u53d8\u5316\uff0c\u800c\u9891\u57df\u8868\u793a\u4fe1\u53f7\u5728\u4e0d\u540c\u9891\u7387\u4e0a\u7684\u5206\u5e03\u60c5\u51b5\u3002\u65f6\u57df\u548c\u9891\u57df\u4e4b\u95f4\u7684\u8f6c\u6362\u516c\u5f0f\u662f\u4fe1\u53f7\u5904\u7406\u4e2d\u91cd\u8981\u7684\u6570\u5b66\u5de5\u5177\uff0c\u5b83\u4eec\u5728\u5404\u4e2a\u9886\u57df\u90fd\u6709\u5e7f\u6cdb\u7684\u5e94\u7528\u3002\u672c\u6587\u5c06\u4ecb\u7ecd\u65f6\u57df\u548c\u9891\u57df\u7684\u8f6c\u6362\u516c\u5f0f\uff0c\u5e76\u63a2\u8ba8\u5b83\u4eec\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\u7684\u4f5c\u7528\u3002<\/p>\n\n\n\n
\u3000\u3000\u65f6\u57df\u662f\u6307\u4fe1\u53f7\u5728\u65f6\u95f4\u4e0a\u7684\u53d8\u5316\u60c5\u51b5\uff0c\u901a\u8fc7\u7ed8\u5236\u4fe1\u53f7\u7684\u5e45\u5ea6\u968f\u65f6\u95f4\u53d8\u5316\u7684\u56fe\u5f62\u6765\u8868\u793a\u3002\u65f6\u57df\u4fe1\u53f7\u53ef\u4ee5\u662f\u8fde\u7eed\u7684\uff0c\u4e5f\u53ef\u4ee5\u662f\u79bb\u6563\u7684\u3002\u9891\u57df\u662f\u6307\u4fe1\u53f7\u5728\u9891\u7387\u4e0a\u7684\u5206\u5e03\u60c5\u51b5\uff0c\u901a\u8fc7\u7ed8\u5236\u4fe1\u53f7\u5728\u4e0d\u540c\u9891\u7387\u4e0a\u7684\u5e45\u5ea6\u6216\u76f8\u4f4d\u6765\u8868\u793a\u3002\u9891\u57df\u4fe1\u53f7\u53ef\u4ee5\u662f\u8fde\u7eed\u7684\uff0c\u4e5f\u53ef\u4ee5\u662f\u79bb\u6563\u7684\u3002<\/p>\n\n\n\n
\u3000\u3000\u5085\u91cc\u53f6\u53d8\u6362\u662f\u5c06\u65f6\u57df\u4fe1\u53f7\u8f6c\u6362\u4e3a\u9891\u57df\u4fe1\u53f7\u7684\u4e00\u79cd\u65b9\u6cd5\u3002\u5b83\u5c06\u4e00\u4e2a\u8fde\u7eed\u65f6\u95f4\u7684\u4fe1\u53f7\u5206\u89e3\u6210\u4e0d\u540c\u9891\u7387\u7684\u6b63\u5f26\u548c\u4f59\u5f26\u51fd\u6570\u7684\u53e0\u52a0\u3002\u5085\u91cc\u53f6\u53d8\u6362\u516c\u5f0f\u53ef\u4ee5\u8868\u793a\u4e3a\uff1a<\/strong><\/p>\n\n\n\n \u3000\u3000F(\u03c9) = \u222bf(t)e^(-j\u03c9t)dt<\/strong><\/p>\n\n\n\n \u3000\u3000\u5176\u4e2d\uff0cF(\u03c9)\u8868\u793a\u9891\u57df\u4fe1\u53f7\uff0cf(t)\u8868\u793a\u65f6\u57df\u4fe1\u53f7\uff0c\u03c9\u8868\u793a\u89d2\u9891\u7387\u3002<\/p>\n\n\n\n \u3000\u3000\u5feb\u901f\u5085\u91cc\u53f6\u53d8\u6362(FFT)\u662f\u8ba1\u7b97\u673a\u4e2d\u5e38\u7528\u7684\u4e00\u79cd\u7b97\u6cd5\uff0c\u7528\u4e8e\u5c06\u79bb\u6563\u65f6\u95f4\u7684\u4fe1\u53f7\u8f6c\u6362\u4e3a\u9891\u57df\u4fe1\u53f7\u3002\u76f8\u6bd4\u4e8e\u4f20\u7edf\u7684\u5085\u91cc\u53f6\u53d8\u6362\uff0cFFT\u5177\u6709\u66f4\u9ad8\u7684\u8ba1\u7b97\u6548\u7387\u3002\u5feb\u901f\u5085\u91cc\u53f6\u53d8\u6362\u516c\u5f0f\u53ef\u4ee5\u8868\u793a\u4e3a\uff1a<\/strong><\/p>\n\n\n\n \u3000\u3000X(k) = \u03a3x(n)e^(-j2\u03c0kn\/N)<\/strong><\/p>\n\n\n\n \u3000\u3000\u5176\u4e2d\uff0cX(k)\u8868\u793a\u9891\u57df\u4fe1\u53f7\uff0cx(n)\u8868\u793a\u79bb\u6563\u65f6\u95f4\u7684\u4fe1\u53f7\uff0ck\u8868\u793a\u9891\u7387\u7684\u7d22\u5f15\uff0cN\u8868\u793a\u4fe1\u53f7\u7684\u957f\u5ea6\u3002<\/p>\n\n\n\n \u3000\u3000\u65f6\u57df\u548c\u9891\u57df\u7684\u8f6c\u6362\u516c\u5f0f\u5728\u4fe1\u53f7\u6ee4\u6ce2\u4e2d\u6709\u7740\u5e7f\u6cdb\u7684\u5e94\u7528\u3002\u901a\u8fc7\u5c06\u65f6\u57df\u4fe1\u53f7\u8f6c\u6362\u4e3a\u9891\u57df\u4fe1\u53f7\uff0c\u53ef\u4ee5\u5bf9\u4fe1\u53f7\u8fdb\u884c\u6ee4\u6ce2\u5904\u7406\uff0c\u53bb\u9664\u4e0d\u9700\u8981\u7684\u9891\u7387\u5206\u91cf\uff0c\u4ece\u800c\u5b9e\u73b0\u4fe1\u53f7\u7684\u53bb\u566a\u548c\u589e\u5f3a\u3002<\/p>\n\n\n\n \u3000\u3000\u9891\u57df\u8868\u793a\u7684\u4fe1\u53f7\u5177\u6709\u7a00\u758f\u6027\uff0c\u5373\u5927\u90e8\u5206\u9891\u7387\u5206\u91cf\u5e45\u5ea6\u8f83\u5c0f\u3002\u901a\u8fc7\u5bf9\u9891\u57df\u4fe1\u53f7\u8fdb\u884c\u538b\u7f29\uff0c\u53ef\u4ee5\u51cf\u5c11\u4fe1\u53f7\u7684\u5b58\u50a8\u7a7a\u95f4\u548c\u4f20\u8f93\u5e26\u5bbd\uff0c\u63d0\u9ad8\u4fe1\u53f7\u7684\u5904\u7406\u6548\u7387\u3002<\/p>\n\n\n\n \u3000\u3000\u65f6\u57df\u548c\u9891\u57df\u7684\u8f6c\u6362\u516c\u5f0f\u5728\u8bed\u97f3\u548c\u56fe\u50cf\u5904\u7406\u4e2d\u4e5f\u6709\u7740\u91cd\u8981\u7684\u5e94\u7528\u3002\u901a\u8fc7\u5c06\u8bed\u97f3\u548c\u56fe\u50cf\u4fe1\u53f7\u8f6c\u6362\u4e3a\u9891\u57df\u4fe1\u53f7\uff0c\u53ef\u4ee5\u5bf9\u5176\u8fdb\u884c\u7279\u5f81\u63d0\u53d6\u3001\u8bc6\u522b\u548c\u538b\u7f29\u7b49\u5904\u7406\uff0c\u5b9e\u73b0\u8bed\u97f3\u548c\u56fe\u50cf\u7684\u5206\u6790\u548c\u5904\u7406\u3002<\/p>\n\n\n\n \u3000\u3000\u65f6\u57df\u548c\u9891\u57df\u7684\u8f6c\u6362\u516c\u5f0f\u662f\u4fe1\u53f7\u5904\u7406\u4e2d\u91cd\u8981\u7684\u6570\u5b66\u5de5\u5177\uff0c\u5b83\u4eec\u53ef\u4ee5\u5c06\u4fe1\u53f7\u5728\u4e0d\u540c\u57df\u4e4b\u95f4\u8fdb\u884c\u8f6c\u6362\uff0c\u4e3a\u4fe1\u53f7\u7684\u5206\u6790\u548c\u5904\u7406\u63d0\u4f9b\u4e86\u4fbf\u5229\u3002\u901a\u8fc7\u5e94\u7528\u65f6\u57df\u548c\u9891\u57df\u7684\u8f6c\u6362\u516c\u5f0f\uff0c\u6211\u4eec\u53ef\u4ee5\u5b9e\u73b0\u4fe1\u53f7\u7684\u6ee4\u6ce2\u3001\u538b\u7f29\u4ee5\u53ca\u8bed\u97f3\u548c\u56fe\u50cf\u5904\u7406\u7b49\u5e94\u7528\u3002\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u6211\u4eec\u9700\u8981\u6839\u636e\u5177\u4f53\u7684\u9700\u6c42\u9009\u62e9\u5408\u9002\u7684\u8f6c\u6362\u65b9\u6cd5\uff0c\u5e76\u7ed3\u5408\u5176\u4ed6\u4fe1\u53f7\u5904\u7406\u6280\u672f\u8fdb\u884c\u7efc\u5408\u5e94\u7528\uff0c\u4ee5\u5b9e\u73b0\u66f4\u597d\u7684\u6548\u679c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":" 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\u5feb\u901f\u5085\u91cc\u53f6\u53d8\u6362<\/h3>\n\n\n\n
\u3000\u3000\u4e09\u3001\u65f6\u57df\u548c\u9891\u57df\u7684\u5e94\u7528<\/h2>\n\n\n\n
\u3000\u30001. \u4fe1\u53f7\u6ee4\u6ce2<\/h3>\n\n\n\n
\u3000\u30002. \u4fe1\u53f7\u538b\u7f29<\/h3>\n\n\n\n
\u3000\u30003. \u8bed\u97f3\u548c\u56fe\u50cf\u5904\u7406<\/h3>\n\n\n\n
\u3000\u3000\u7ed3\u8bba\uff1a<\/h2>\n\n\n\n