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- W1990383786 abstract "This paper proposes a modified post-filter to recover a Modulation Spectrum (MS) in HMM-based speech synthesis. To alleviate the over-smoothing effect which is one of the major problems in HMM-based speech synthesis, the MS-based post-filter has been proposed. It recovers the utterance-level MS of the generated speech trajectory, and we have reported its benefit to the quality improvement. However, this post-filter is not applicable to various lengths of speech parameter trajectories, such as phrases or segments, which are shorter than an utterance. To address this problem, we propose two modified post-filters, (1) the time-invariant filter with a simplified conversion form and (2) the segment-level post-filter which applicable to a short-term parameter sequence. Furthermore, we also propose (3) the post-filter to recover the phoneme-level MS of HMM-state duration. Experimental results show that the modified post-filters also yield significant quality improvements in synthetic speech as yielded by the conventional post-filter." @default.
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- W1990383786 date "2014-12-01" @default.
- W1990383786 modified "2023-09-23" @default.
- W1990383786 title "Modified post-filter to recover modulation spectrum for HMM-based speech synthesis" @default.
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- W1990383786 doi "https://doi.org/10.1109/globalsip.2014.7032177" @default.
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