https://blog.csdn.net/andywu24/article/details/78563851
https://blog.csdn.net/zashizhi3299/article/details/103945648
https://www.jianshu.com/p/00d732cf276a
http://www.elecfans.com/tools/dbm.htm
dB、dBm、dBw和w的换算关系
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https://blog.csdn.net/andywu24/article/details/78563851
https://blog.csdn.net/zashizhi3299/article/details/103945648
https://www.jianshu.com/p/00d732cf276a
http://www.elecfans.com/tools/dbm.htm
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