关键词: 经验模态分解, 自适应滤波, 语音增强

Abstract: In order to improve Signal Noise Ratio（SNR） of speech signal, an approach of speech enhancement that combines Empirical Mode Decomposition（EMD） and self-adaptive filter is presented. The noisy speech is decomposed into several Impirical Mode Functions（IMFs） by EMD. All IMFs are separated into three groups and the IMFs of every group are added up to form three sub signals. The noise in three sub signals is adaptively filtered. Three sub signals that are output from the self-adaptive filter are used to reconstruct the enhanced speech signal. Simulation experiments show that the effect of speech enhancement of the proposed approach is better than that of self-adaptive filter.

Key words: Empirical Mode Decomposition, self-adaptive filter, speech enhancement