I. Introduction
AUDIO processing system is often suffering from noise trouble. Though the noise is from different sources and resulting from a variety of reasons, if we do not deal with the noise, it will seriously affect the audio quality and even lead to audio processing failure. For example, the 32-channel mix, the noise level of each road is acceptable, but the noise level after mixing may be beyond the audio level and even lead to mixing failure. Therefore, when processing, we always find ways to restrain the noise in storage and transmission.