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Continuous Noise Masking Based Vocoder for Statistical Parametric Speech Synthesis

Mohammed Salah AL-RADHI, Tamás Gábor CSAPÓ, Géza NÉMETH

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Summary :

In this article, we propose a method called “continuous noise masking (cNM)” that allows eliminating residual buzziness in a continuous vocoder, i.e. of which all parameters are continuous and offers a simple and flexible speech analysis and synthesis system. Traditional parametric vocoders generally show a perceptible deterioration in the quality of the synthesized speech due to different processing algorithms. Furthermore, an inaccurate noise resynthesis (e.g. in breathiness or hoarseness) is also considered to be one of the main underlying causes of performance degradation, leading to noisy transients and temporal discontinuity in the synthesized speech. To overcome these issues, a new cNM is developed based on the phase distortion deviation in order to reduce the perceptual effect of the residual noise, allowing a proper reconstruction of noise characteristics, and model better the creaky voice segments that may happen in natural speech. To this end, the cNM is designed to keep only voice components under a condition of the cNM threshold while discarding others. We evaluate the proposed approach and compare with state-of-the-art vocoders using objective and subjective listening tests. Experimental results show that the proposed method can reduce the effect of residual noise and can reach the quality of other sophisticated approaches like STRAIGHT and log domain pulse model (PML).

Publication
IEICE TRANSACTIONS on Information Vol.E103-D No.5 pp.1099-1107
Publication Date
2020/05/01
Publicized
2020/02/10
Online ISSN
1745-1361
DOI
10.1587/transinf.2019EDP7167
Type of Manuscript
PAPER
Category
Speech and Hearing

Authors

Mohammed Salah AL-RADHI
  Budapest University of Technology and Economics
Tamás Gábor CSAPÓ
  Budapest University of Technology and Economics,MTA-ELTE Lendület Lingual Articulation Research Group
Géza NÉMETH
  Budapest University of Technology and Economics

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