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请教波形问题

Other Parts Discussed in Thread: PCM2904

请教一下造成波形失真的原因是什么呢,

这是我用PCM2904做的声卡,输出信号并连到输入,测试正弦波无失真,三角波无失真,但方波和锯齿波有失真,不知是信号

 

  通路中什么原因造成的