T. Okamoto, T. Toda and H. Kawai,
"Multi-stream HiFi-GAN with data-driven waveform decomposition,"
in Proc. ASRU, Dec. 2021, pp. 610–617.
https://asru2021.org
Synthesized speech demo samples:
https://ast-astrec.nict.go.jp/demo_samples/asru_2021_okamoto/index.html