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DSP5509A和AIC23驱动扬声器,扬声器发声问题



DSP5509A和AIC23产生白噪声可以通过扬声器播放,输出的值有4254等,但是经过FIR滤波后输出的信号,输出值也是4000左右,但是扬声器确没有声音,是什么原因呢?