声質変換の概要と最新手法の紹介

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• STRAIGHT [Kawahara+; ’99]
• WORLD [Morise+; ’16]

Vocoder
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vocoder
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F0bap
F0bap
F0bap
1 frame
frame
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[Abe+; ’90][stylianou+; ’98]
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F0bap
F0bap
GMM DNN

[Abe+; ’90][stylianou+; ’98]
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AF0bap
AF0bap
GMM DNN
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→ A
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Parallel-data
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A
frame
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B

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Voice Conversion Challenge 2016
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Results of listening tests in VCC 2016
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cf. http://vc-challenge.org/vcc2016/summary.html

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CycleGAN [Zhu+; ’17]
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cf. https://junyanz.github.io/CycleGAN/

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Forward-inverse mapping Inverse-forward mapping
GX→Y GY→X G L real/fake loss
[Kaneko+; ‘17]
M
mapping loss

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n
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GX→Y adversarial loss

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= "#~%&'(' # log,- . + "0~%&'(' 0 log 1 − ,- 34→- .
GY→X adversarial loss

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L1loss

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λcyc 10.0

CycleGAN parallel-data-free [Kaneko+, ’17]
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CycleGAN
copy
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VC
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Network architecture
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Variational autoencoder (VAE) [Hinton+; '06]
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x
Encoder
qθ(z|X)
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# $; 0, 1
Input feature Generated feature

VQ-VAE [van den Oord+, ‘17]
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VQ-VAE
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! " # = %
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VQ-VAE [van den Oord+, ’17]
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Encoder WaveNet
ze(x)
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zq(x)
id
• zq(x) id
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( )
https://avdnoord.github.io/homepage/vqvae/

VQ-VAE [van den Oord+; ‘17]
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Encoder WaveNet
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cf. https://www.slideshare.net/YukiSaito8/saito18sp03
• zq(x) id
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https://avdnoord.github.io/homepage/vqvae/

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声質変換の概要と最新手法の紹介

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声質変換の概要と最新手法の紹介