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TLV320AIC3204的ADC控制问题

Other Parts Discussed in Thread: TLV320AIC3204

各位好,我使用TLV320AIC3204做ADC输入,I2S立体声输出,希望做到,当左声道有声音输入时,关闭右声道的声音输入或者将右声道增益调到十分小,以左声道声音为主,当左声道没有声音输入时,打开右声道的声音输入,所以我需要实时知道左声道的声音输入,请问这个怎么知道?我看了寄存器表,没有关于音量判断的寄存器,请各位帮忙看看,如何实现,谢谢!