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DEMO_DGT - Basic introduction to DGT analysis/synthesis

Description

This demo shows how to compute Gabor coefficients of a signal.

demo_dgt_1.png

Spectrogram of the 'bat' signal.

The figure shows a spectrogram of the 'bat' signal. The coefficients are shown on a linear scale.
demo_dgt_2.png

Gabor coefficients of the 'bat' signal.

The figure show a set of Gabor coefficients for the 'bat' signal, computed using a DGT with a Gaussian window. The coefficients contains all the information to reconstruct the signal, even though there a far fewer coefficients than the spectrogram contains.
demo_dgt_3.png

Real-valued Gabor analysis

This figure shows only the coefficients for the positive frequencies. As the signal is real-value, these coefficients contain all the necessary information. Compare to the shape of the spectrogram shown on Figure 1.
demo_dgt_4.png

DGT coefficients on a spectrogram

This figure shows how the coefficients from DGTREAL can be picked from the coefficients computed by a full Short-time Fourier transform, as visualized by a spectrogram.