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230问答网 > 信噪比，比特信噪比区别是什么？

信噪比，比特信噪比区别是什么？

2025-04-01 16:17:33

推荐回答（3个）

回答1：

信噪比指信号功率与噪声功率比值，SNR=Ps/Pn;
比特信噪比指一个比特周期内，信号能量与噪声能量比，(SNR)b=Ps*Tb/No*B*Tb=Eb/No;
其中，Ps为信号功率，Pn为噪声功率，Tb为单位比特周期，Eb为单位比特信号能量，No为噪声功率谱密度，B为噪声带宽也即单位比特带宽，其值B=1/Tb。

回答2：

信噪比是指信号平均功率和噪声平均功率的比值，比特信噪比是指单位比特信号功率和噪声功率的比值

回答3：

例如，某音箱的信噪比为80dB，即输出信号功率比噪音功率大80dB。信噪比数值越高，噪音越小。国际电工委员会对信噪比的最低要求是前置放大器大于等于63dB，

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