This script sets up a non-stationary Gabor frame with the specified
parameters, computes windows and corresponding canonical dual windows
and a test signal, and plots the windows and the energy of the
coefficients.
Windows + dual windows
This figure shows the window functions used and the corresponding
canonical dual windows.
Spectrogram (absolute value of coefficients in dB)
This figure shows a (colour-coded) image of the nsdgt coefficient
modulus.