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IIS数据还原1KHZ波形

Other Parts Discussed in Thread: TLV320ADC3101

ADC:TLV320ADC3101  FS=44.1K

音频:1KHZ正弦波

MIC录音经过ADC转换,通过IIS获得音频数据还原出的波形如下

请问:如何是还原的波形更加平滑(目前采集到的数据连续4个都是同样的值)