Phase restoration algorithm

[mazzzystar]

Phase restoration algorithm

[mazzzystar]

This is called Griffin-Lim algorithm. The idea inside is to use spectrogram to gradually reconstruct the phase:

1. we have only the spectrogram S, we randomly initialize the phase with P, so we get the magnitude M.
2. Pass M to the ISTFT to get the raw wav and we get a new phase P'.
3. Replace P with P' and combine it with S to a new magnitude M', this time we think it's much closer to the real magnitude.
4. repeat 2) 3) for iter=50 times.

[asmekal]

Thank you for help!