20KHz左右的中频信号(同正弦波差不多),我想用AD采样来检测其过零点,20KHz的周期为50us,假如我用定时采样,一个周期采样20个点,每2.5us采样一次,这样频繁的进入定时中断会不会不太好,另外,检测其过零点有没有更好的机制与方法,请各位大神解答?
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