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cc3200 audio boosterpack 音频采集是不是底噪很大

Other Parts Discussed in Thread: TLV320AIC3254

基于TLV320AIC3254的音频开发办,我烧入wifi_audio_app例程(例程中关掉板载咪头输入,并将音量调到最大),另两入输入接口没有接音频信号,但是板子一直吱吱吱的响,是板子本身底噪就这么大吗?