Fast adaptive estimation of noise spectrum

A fast adaptive method for noise spectrum estimation is proposed in this paper.We improve the algorithm of noise spectrum estimation proposed by Doblinger and Cohen.This is achieved by modifying the threshold for judging presence of speech in sub-bands and the formula of noise spectrum update.The estimated noise spectrum can quickly adapt with background noise and keep accuracy at the same time.Results show that,by using this method,a speech enhancement system has good performance both in stationary and non-stationary noise suppression,and also under sudden change of noise.