+ Mean opinion score (a) Normal condition (1.0 × fo ) of male speech WaveNet Original WORLD uSFGAN HiFi-GAN (melspc) Harmonic-Net + Mean opinion score (b) Normal condition (1.0 × fo ) of female speech WORLD uSFGAN HiFi-GAN Harmonic-Net + Mean opinion score (c) 0.5 × fo condition of male speech WORLD uSFGAN HiFi-GAN Harmonic-Net + Mean opinion score (d) 0.5 × fo condition of female speech WORLD uSFGAN HiFi-GAN Harmonic-Net + Mean opinion score (e) 1.5 × fo condition of male speech WORLD uSFGAN HiFi-GAN Harmonic-Net + Mean opinion score (f) 1.5 × fo condition of female speech
Harmonic-Net Mean opinion score PeriodNet (a) Normal (1.0 × fo ) condition WORLD HiFi-GAN Mean opinion score PeriodNet (melspc) Original (c) 1.5 × fo condition WORLD HiFi-GAN Harmonic-Net Mean opinion score PeriodNet Harmonic- Net