Non-Parallel Voice Conversion System With WaveNet Vocoder and Collapsed Speech Suppression

In this paper, we integrate a simple non-parallel voice conversion (VC) system with a WaveNet (WN) vocoder and a proposed collapsed speech suppression technique. The effectiveness of WN as a vocoder for generating high-fidelity speech waveforms on the basis of acoustic features has been confirmed in...

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Vydané v:	IEEE access Ročník 8; s. 62094 - 62106
Hlavní autori:	Wu, Yi-Chiao, Tobing, Patrick Lumban, Kobayashi, Kazuhiro, Hayashi, Tomoki, Toda, Tomoki
Médium:	Journal Article
Jazyk:	English
Vydavateľské údaje:	Piscataway IEEE 2020 The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Predmet:	Acoustic noise Acoustics Adaptation models collapsed speech segment detection Conversion Degradation linear predictive coding distribution constraint Non-parallel voice conversion Segments Speech Speech coding Speech processing Training Vocoders Voice Waveforms WaveNet vocoder
ISSN:	2169-3536, 2169-3536
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Abstract	In this paper, we integrate a simple non-parallel voice conversion (VC) system with a WaveNet (WN) vocoder and a proposed collapsed speech suppression technique. The effectiveness of WN as a vocoder for generating high-fidelity speech waveforms on the basis of acoustic features has been confirmed in recent works. However, when combining the WN vocoder with a VC system, the distorted acoustic features, acoustic and temporal mismatches, and exposure bias usually lead to significant speech quality degradation, making WN generate some very noisy speech segments called collapsed speech. To tackle the problem, we take conventional-vocoder-generated speech as the reference speech to derive a linear predictive coding distribution constraint (LPCDC) to avoid the collapsed speech problem. Furthermore, to mitigate the negative effects introduced by the LPCDC, we propose a collapsed speech segment detector (CSSD) to ensure that the LPCDC is only applied to the problematic segments to limit the loss of quality to short periods. Objective and subjective evaluations are conducted, and the experimental results confirm the effectiveness of the proposed method, which further improves the speech quality of our previous non-parallel VC system submitted to Voice Conversion Challenge 2018.
AbstractList	In this paper, we integrate a simple non-parallel voice conversion (VC) system with a WaveNet (WN) vocoder and a proposed collapsed speech suppression technique. The effectiveness of WN as a vocoder for generating high-fidelity speech waveforms on the basis of acoustic features has been confirmed in recent works. However, when combining the WN vocoder with a VC system, the distorted acoustic features, acoustic and temporal mismatches, and exposure bias usually lead to significant speech quality degradation, making WN generate some very noisy speech segments called collapsed speech. To tackle the problem, we take conventional-vocoder-generated speech as the reference speech to derive a linear predictive coding distribution constraint (LPCDC) to avoid the collapsed speech problem. Furthermore, to mitigate the negative effects introduced by the LPCDC, we propose a collapsed speech segment detector (CSSD) to ensure that the LPCDC is only applied to the problematic segments to limit the loss of quality to short periods. Objective and subjective evaluations are conducted, and the experimental results confirm the effectiveness of the proposed method, which further improves the speech quality of our previous non-parallel VC system submitted to Voice Conversion Challenge 2018.
Author	Hayashi, Tomoki Kobayashi, Kazuhiro Wu, Yi-Chiao Tobing, Patrick Lumban Toda, Tomoki
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SubjectTerms	Acoustic noise Acoustics Adaptation models collapsed speech segment detection Conversion Degradation linear predictive coding distribution constraint Non-parallel voice conversion Segments Speech Speech coding Speech processing Training Vocoders Voice Waveforms WaveNet vocoder
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Title	Non-Parallel Voice Conversion System With WaveNet Vocoder and Collapsed Speech Suppression
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