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AIC3254破音的情况



你们好,

     近期在调8168+aic3254,调通了2路 mic(IN1 / 2)1路line_in  (IN 3),line_out 输出。我现在用arecord 工具去录制音频,我的"AGC Max PGA" 和 “PGA Level Volume” 已调了最小音,AGC的“AGC Noise Threshold”也用最大值。 但声音能量大的时候,就有破音和兹兹的声音,我想问下AIC3254这芯片怎么设置声音大到一定的音量可以自动压下来呢?