Generate audio signal from magnitude spectrogram
The MagSpectrogram class has the method audio_signal() to compute an audio signal from a spectrogram. However, the current implmentation does not take into account the window function used to compute the spectrogram (as it should) and also does not take into account any phase information. This should be improved for release 2.0.0
The accuracy could probably be improved by including phase information, or a phase recostruction algorithm such as the Griffin Lim algorithm
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