Real time spectrogram inversion on mobile phone

Understand

We present two methods of real time magnitude spectrogram inversion: streaming Griffin Lim(GL) and streaming MelGAN.

• We demonstrate the impact of looking ahead on perceptual quality of MelGAN.
• As little as one hop size (12.5ms) of lookahead is able to significantly improve perceptual quality in comparison to its causal version.
• We compare streaming GL with the streaming MelGAN and show different trade-offs in terms of perceptual quality, on-device latency, algorithmic delay, memory footprint and noise sensitivity.