webrtc的aec3模块，其他不相关的部分已经移除
带误差反馈的格型RLS算法， 用来做aec的线性自适应滤波部分。 比普通的格型RLS的数值稳定性更好
用sinc插值法，进行16khz到44.1khz信号的重采样
老权提供的两个webrtc的vad
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