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关于PCM1802信噪比问题

Other Parts Discussed in Thread: PCM1802

首先,我们把实验室的标准音频源通过PCM1802转换以后通过ASI输出,再由解码器解码输出测试音频信号的信噪比只有40dB。查看了PCM1802的资料没有找到可以提高信噪比的办法,因此,现在不知道有哪些因素导致信噪比如此低。有什么方法可以提高信噪比。