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DEMO_PHASERET - Phase retrieval and phase difference

Description

This demo demonstrates iterative reconstruction of a spectrogram and the phase difference.

demo_phaseret_1.png

Original spectrogram

This figure shows the target spectrogram of an excerpt of the gspi signal
demo_phaseret_2.png

Phase difference

This figure shows a difference between the original phase and the reconstructed using 100 iterations of a Fast Griffin-Lim algorithm. Note: The figure in the LTFAT 2.0 paper differs slightly because it is genarated using 1000 iterations.