Objective Evaluation Method of Speech Quality Based on Auditory Perceptual Properties
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Based on Mel-frequency cepstral coefficients(MFCC),Mel-cepstral distance measure(Mel-CD) algorithm used for the objective evaluation of speech quality was analyzed.According to the theory of psychoacoustics,a human auditory model proposed by Johannesma and nonlinear compression were applied to extracting MFCC.Gammatone filter bank was used to simulate the basilar membrane.Mel-cepstral gammatone filter bank distance measure(Mel-GD) based on the improved MFCC was proposed,which was more in accordance with the auditory perceptual properties.Performance testing results showed that the proposed algorithm compared favorably with the Mel-CD in time complexity,the correlation degree between objective evaluation and subjective evaluation was improved by 4.9%,and estimation bias was decreased by 45.5%.