Internal soundgen function.
guessPhase_spsi(spec, windowLength_points, step_points)
Returns a matrix of the same dimensions as `spec` containing the guessed phase.
the spectrogram that is to be transform to a time series: numeric matrix with frequency bins in rows and time frames in columns
STFT window length in points
STFT step in points
Single-pass spectrogram inversion as described in Beauregard, G. T., Harish,
M., & Wyse, L. (2015, July). Single pass spectrogram inversion. In 2015 IEEE
International Conference on Digital Signal Processing (DSP) (pp. 427-431).
IEEE. See invertSpectrogram
for details.