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3254采用I2S作为音频输入，模拟输出端的耳放的声音信号没有噪声，很干净。但是示波器实际测试时发现如图的噪声信号，想问一下这些噪声是真实存在的，耳机里面听不到，还是示波器的问题呢？
首先要确保示波器的地和3254的地连接在了一起，然后测量一下示波器的探头在接地时的状态，就可以排除示波器的问题
