A comparison between STRAIGHT, glottal, and sinusoidal vocoding in statistical parametric speech synthesis

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2018-09
Major/Subject
Mcode
Degree programme
Language
en
Pages
13
1658-1670
Series
IEEE/ACM Transactions on Audio Speech and Language Processing, Volume 26, issue 9
Abstract
A vocoder is used to express a speech waveform with a controllable parametric representation that can be converted back into a speech waveform. Vocoders representing their main categories (mixed excitation, glottal, sinusoidal vocoders) were compared in this study with formal and crowd-sourced listening tests. Vocoder quality was measured within the context of analysis-synthesis as well as text-to-speech (TTS) synthesis in a modern statistical parametric speech synthesis framework. Furthermore, the TTS experiments were divided into synthesis with vocoder-specific features and synthesis with a shared envelope model, where the waveform generation method of the vocoders is mainly responsible for the quality differences. Finally, all of the tests included four distinct voices as a way to investigate the effect of different speakers on the synthesized speech quality. The obtained results suggest that the choice of the voice has a profound impact on the overall quality of the vocoder-generated speech, and the best vocoder for each voice can vary case by case. The single best-rated TTS system was obtained with the glottal vocoder GlottDNN using a male voice with low expressiveness. However, the results indicate that the sinusoidal vocoder PML (pulse model in log-domain) has the best overall performance across the performed tests. Finally, when controlling for the spectral models of the vocoders, the observed differences are similar to the baseline results. This indicates that the waveform generation method of a vocoder is essential for quality improvements.
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Keywords
Acoustics, Predictive models, Production, Speech synthesis, statistical parametric speech synthesis, Transfer functions, vocoder, Vocoders
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Citation
Airaksinen, M, Juvela, L, Bollepalli, B, Yamagishi, J & Alku, P 2018, ' A comparison between STRAIGHT, glottal, and sinusoidal vocoding in statistical parametric speech synthesis ', IEEE/ACM Transactions on Audio Speech and Language Processing, vol. 26, no. 9, pp. 1658-1670 . https://doi.org/10.1109/TASLP.2018.2835720