Abstract
For enhancing noise corrupted speech, Rayleigh modeling of Teager energy (TE) operated perceptual wavelet packet (PWP) coefficients of the noisy speech is proposed in this paper. In order to obtain an enhanced speech, a threshold is derived and applied on the PWP coefficients by employing a custom thresholding function, which is designed based on a combination of μ-law and semisoft thresholding functions. The effectiveness of the proposed method is evaluated for car and multi-talker babble noise corrupted speech signals through performing extensive simulations using the NOIZEUS database. The proposed method is found to outperform some of the state-of-the-art speech enhancement methods not only at high but also at low levels of SNR in terms of standard objective measures and subjective evaluations including formal listening tests.
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