A kind of modified speech enhancement algorithm based on wavelet package transformation

The framework of traditional speech enhancement algorithm based on the wavelet package transformation is composed of three parts, which lies in the decomposition to the noisy speech signal based on wavelet package transformation (WPD), the denoising to the coefficients of wavelet decomposition and the reconstruction of the clean speech signal. The proposed algorithm focuses on three points to improve the performance of the traditional speech enhancement algorithm. In the first part, special decomposition of the wavelet package is adopted to mimic the model of the human ears (WPDHE). In the second part, the adaptive thresh estimation (ATHRSH) and the combination of soft threshold and the modified hard threshold functions (CSMHDF) are used. The experiments prove that this algorithm is more sufficient than the traditional speech enhancement algorithm.