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CODEC信号波形

Other Parts Discussed in Thread: TLV320AIC12K

DSP的I2C配置CODEC(TVL320AIC12K)实现环路测试,在输入端接入1KHz,峰峰值10mV的正弦信号,通过Mcbsp接口实现CODEC的接收和发送,但是发现发现输出信号有点异常,请问各位大神这是怎么回事啊?附件为抓的图