https://blog.csdn.net/yangtalent1206/article/details/11727245/
https://blog.csdn.net/qq_29362303/article/details/89351354
https://blog.csdn.net/zhy295006359/article/details/110766119
dB的放大倍数换算
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https://blog.csdn.net/yangtalent1206/article/details/11727245/
https://blog.csdn.net/qq_29362303/article/details/89351354
https://blog.csdn.net/zhy295006359/article/details/110766119
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