I. Introduction
According to the number of microphones used in receiving speech signal, speech enhancement system can be divided into monaural speech enhancement system and multi-channel speech enhancement system. The traditional monaural method can introduce speech distortion while removing noise. However, the method based on microphone array integrates the location information of sound source, so it can effectively suppress other interferences, reduce the noise of the surrounding environment, and effectively solve the contradiction between noise elimination and speech distortion in single-channel method.