Speech signal enhancement through adaptive wavelet thresholding

Authors:
Michael T. Johnson;Xiaolong Yuan;Yao Ren
Affiliations:
Department of Electrical and Computer Engineering, 1515 W. Wisconsin Avenue, Milwaukee, WI 53233, United States;Motorola Electronics Ltd, No. 108 Jain Guo Road, Chao Yang District, Beijing 100022, PR China;Department of Electrical and Computer Engineering, 1515 W. Wisconsin Avenue, Milwaukee, WI 53233, United States
Venue:
Speech Communication
Year:
2007

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Abstract

This paper demonstrates the application of the Bionic Wavelet Transform (BWT), an adaptive wavelet transform derived from a non-linear auditory model of the cochlea, to the task of speech signal enhancement. Results, measured objectively by Signal-to-Noise ratio (SNR) and Segmental SNR (SSNR) and subjectively by Mean Opinion Score (MOS), are given for additive white Gaussian noise as well as four different types of realistic noise environments. Enhancement is accomplished through the use of thresholding on the adapted BWT coefficients, and the results are compared to a variety of speech enhancement techniques, including Ephraim Malah filtering, iterative Wiener filtering, and spectral subtraction, as well as to wavelet denoising based on a perceptually scaled wavelet packet transform decomposition. Overall results indicate that SNR and SSNR improvements for the proposed approach are comparable to those of the Ephraim Malah filter, with BWT enhancement giving the best results of all methods for the noisiest (-10db and -5db input SNR) conditions. Subjective measurements using MOS surveys across a variety of 0db SNR noise conditions indicate enhancement quality competitive with but still lower than results for Ephraim Malah filtering and iterative Wiener filtering, but higher than the perceptually scaled wavelet method.