AD采样频率是48kHz, 输入DMA缓存点数128个。对应周期为375Hz。
将DMA缓存输出到DA的数值都设为0,但是输出的波形如下,有明显的375Hz的噪声和高频谐波噪声。
如何能避免这种噪声?人耳对这种中高频噪声更加敏感。
一开始以为是帧平滑的问题,现在输出设为0却还是有噪声,请大家帮忙看一下,感谢!
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