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Traditional speech enhancement algorithms are mainly to remove the noise which is stable or changes slowly and do not adapt to deal with the background noise which changes very quickly. In order to solve this problem, a new single-channel telephone speech enhancement method is presented for non-stationary noisy environment in this paper. Based on two new speech parameters--Voice Peak Bandwidth (VPB)...
Although hidden Markov model based speech synthesis has been proved to have good performance, there are still some factors which degrade the quality of synthesized speech: vocoder, model accuracy and over-smoothing. This paper analyzes these factors separately. Modifications for removing different factors are proposed. Experimental results show that over-smoothing in frequency domain mainly affect...
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