Feature inversion

mel_to_stft	Approximate STFT magnitude from a Mel power spectrogram.
mel_to_audio	Invert a mel power spectrogram to audio using Griffin-Lim.
mfcc_to_mel	Invert Mel-frequency cepstral coefficients to approximate a Mel power spectrogram.
mfcc_to_audio	Convert Mel-frequency cepstral coefficients to a time-domain audio signal