Robust speaker identification system based on wavelet transform and Gaussian mixture model

This paper presents an effective method for improving the performance of a speaker identification system. Based on the multiresolution property of the wavelet transform, the input speech signal is decomposed into various frequency bands in order not to spread noise distortions over the entire feature space. The linear predictive cepstral coefficients (LPCCs) of each band are calculated. Furthermore, the cepstral mean normalization technique is applied to all computed features. We use feature recombination and likelihood recombination methods to evaluate the task of the text-independent speaker identification. The feature recombination scheme combines the cepstral coefficients of each band to form a single feature vector used to train the Gaussian mixture model (GMM). The likelihood recombination scheme combines the likelihood scores of independent GMM for each band. Experimental results show that both proposed methods outperform the GMM model using full-band LPCCs and mel-frequency cepstral coefficients (MFCCs) in both clean and noisy environments.