Abstract
In this chapter, two hybrid source modeling methods are proposed for improving the quality of HMM-based speech synthesis. In the first method, the optimal pitch-synchronous residual frames which represent the excitation signals of phones are used for modeling the source. In the second method, a hybrid source model which is capable of generating the excitation signal specific to every phone is proposed. Initially, an analysis of phone-dependent characteristics of the excitation signal is performed. In the proposed source model, the pitch-synchronous residual frames of a phone are modeled as a sum of deterministic and noise components.
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