推导出理想的信噪比公式时，首先定义信号的均方根。
When you derive the ideal SNR formula, you first define the RMS signal.
这样的方法对信号的输入信噪比无过高要求，也可适当避免音乐噪声的产生。
This method can be used in many SNR, also can avoid musical noise.
这样的方法对信号的输入信噪比无过高要求，也可适当避免音乐噪声的产生。
This method can be used in many SNR, also can avoid musical noise.
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