{"id":5312,"date":"2021-04-21T06:56:02","date_gmt":"2021-04-21T13:56:02","guid":{"rendered":"https:\/\/www.xh86.me\/?p=5312"},"modified":"2021-12-19T23:08:45","modified_gmt":"2021-12-20T07:08:45","slug":"%e5%a6%82%e4%bd%95%e8%a7%a3%e9%87%8a%e5%92%8c%e8%ae%a1%e7%ae%97db%e3%80%81dbm%e3%80%81dbw%e5%ae%83%e4%bb%ac%e5%88%b0%e5%ba%95%e6%9c%89%e5%95%a5%e5%8c%ba%e5%88%ab%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.xh86.me\/?p=5312","title":{"rendered":"\u5982\u4f55\u89e3\u91ca\u548c\u8ba1\u7b97dB\u3001dBm\u3001dBw\u2026\u2026\u5b83\u4eec\u5230\u5e95\u6709\u5565\u533a\u522b\uff1f"},"content":{"rendered":"
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dB\u5e94\u8be5\u662f\u65e0\u7ebf\u901a\u4fe1\u4e2d\u6700\u57fa\u672c\u3001\u6700\u4e60\u4ee5\u4e3a\u5e38\u7684\u4e00\u4e2a\u6982\u5ff5\u4e86\u3002\u6211\u4eec\u5e38\u8bf4\u201c\u4f20\u64ad\u635f\u8017\u662fxx dB\u201d\u3001\u201c\u53d1\u5c04\u529f\u7387\u662fxx dBm\u201d\u3001\u201c\u5929\u7ebf\u589e\u76ca\u662fxx dBi\u201d\u2026\u2026<\/span><\/section>\n
\u00a0<\/span><\/section>\n
\u6709\u65f6\uff0c\u8fd9\u4e9b\u957f\u5f97\u5f88\u50cf\u7684dBx\u4eec\u53ef\u80fd\u88ab\u5f04\u6df7\uff0c\u751a\u81f3\u9020\u6210\u8ba1\u7b97\u5931\u8bef\u3002\u5b83\u4eec\u7a76\u7adf\u6709\u4ec0\u4e48\u533a\u522b\u5462\uff1f<\/span><\/section>\n
\u00a0<\/span><\/section>\n
<\/div><\/section>\n
<\/section>\n
\u8fd9\u4e8b\u4e0d\u5f97\u4e0d\u5148\u4ece<\/span>dB<\/span><\/strong>\u8bf4\u8d77\u3002<\/span><\/section>\n
\u00a0<\/span><\/section>\n
\u800c\u8bf4\u5230dB\uff0c\u6700\u5e38\u89c1\u7684\u5c31\u662f<\/span>3 dB<\/span><\/strong>\u5566\uff01<\/span><\/section>\n
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3 dB\u5728\u529f\u7387\u56fe\u6216\u8bef\u7801\u7387\u56fe\u4e2d\u7ecf\u5e38\u51fa\u73b0\u3002\u5176\u5b9e\uff0c\u6ca1\u4ec0\u4e48\u795e\u79d8\u7684\uff0c\u4e0b\u964d3 dB\u5c31\u662f\u6307\u529f\u7387\u4e0b\u964d\u4e00\u534a\uff0c3 dB\u70b9\u6307\u7684\u5c31\u662f\u534a\u529f\u7387\u70b9\u3002<\/span>\u00a0<\/span><\/section>\n
<\/div><\/section>\n
+3 dB<\/span>\u8868\u793a\u589e\u5927\u4e3a\u4e24\u500d\uff0c<\/span>-3 dB<\/span>\u8868\u793a\u4e0b\u964d\u4e3a<\/span>1\/2<\/span>\u3002<\/span>\u8fd9\u662f\u600e\u4e48\u6765\u7684\u5462\uff1f<\/span><\/section>\n
\u00a0<\/span><\/section>\n
\u5176\u5b9e\u5f88\u7b80\u5355\uff0c\u8ba9\u6211\u4eec\u4e00\u8d77\u770b\u4e0bdB\u7684\u8ba1\u7b97\u516c\u5f0f\uff1a<\/span><\/section>\n
<\/div><\/section>\n
<\/section>\n
dB\u8868\u793a\u529f\u7387P<\/span>1<\/span>\u76f8\u5bf9\u4e8e\u53c2\u8003\u529f\u7387P<\/span>0<\/span>\u7684\u5927\u5c0f\u5173\u7cfb\u3002\u5982\u679cP<\/span>1<\/span>\u662fP<\/span>0<\/span>\u76842\u500d\uff0c\u90a3\u4e48\uff1a\u00a0<\/span><\/section>\n
<\/div><\/section>\n
<\/section>\n
\u5982\u679cP<\/span>1<\/span>\u662fP<\/span>0<\/span>\u7684\u4e00\u534a\uff0c\u90a3\u4e48\uff1a\u00a0<\/span><\/section>\n
<\/div><\/section>\n
\u00a0<\/span><\/section>\n
\u5173\u4e8e\u5bf9\u6570\u7684\u57fa\u672c\u6982\u5ff5\u53ca\u8fd0\u7b97\u6027\u8d28\uff0c\u5927\u5bb6\u53ef\u4ee5\u81ea\u884c\u56de\u987e\u4e0b\u9ad8\u4e00\u6570\u5b66\u3002\u3002\u3002<\/span>\u00a0<\/span><\/section>\n
\u00a0<\/span><\/section>\n
<\/div><\/section>\n
\u00a0<\/span><\/section>\n
\u73b0\u5728\u51fa\u9053\u9898\u6765\u68c0\u9a8c\u4e0b\u4f60\u7684\u7406\u89e3\u7a0b\u5ea6\uff1a<\/span><\/section>\n
\u3010\u95ee<\/strong>\u3011\u529f\u7387\u589e\u5927\u4e3a10\u500d\uff0c\u7528\uff1fdB\u8868\u793a<\/span><\/section>\n
\u00a0<\/span><\/section>\n
\n
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\u70b9\u51fb\u4e0b\u65b9\u7a7a\u767d\u533a\u57df\u67e5\u770b\u7b54\u6848<\/span><\/p>\n

\u25bc<\/span><\/p>\n