DEMO_DGT Basic introduction to DGT analysis/synthesis
This demo shows how to compute Gabor coefficients of a signal.
Figure 1: Spectrogram of the 'bat' signal.
The figure shows a spectrogram of the 'bat' signal. The
coefficients are shown on a linear scale.
Figure 2: 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.
Figure 3: 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.
Figure 4: 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.
Url: http://ltfat.github.io/doc/demos/demo_dgt.html
See also: sgram, dgt, dgtreal.
Package: ltfat