A new approach for wavelet speech enhancement
Mohammed Bahoura, Jean Rouat · 2001
We propose a new approach to improve the performance of speech enhancement techniques based on wavelet thresholding. First, space–adaptation of the threshold is obtained by extending the principle of the level–dependent threshold to the Wavelet Packet Transform (WPT). Next, the time–adaptation is introduced using the Teager Energy Operator (TEO) of the wavelets coefficients. Finally, the time–space adapted threshold is proposed. Comparisons with the Ephraim and Malah Filter are reported.