  This article deals with the use of optimal lattice and optimal window in
Discrete Gabor Transform computation. In the case of a generalized Gaussian
window, extending earlier contributions, we introduce an additional local
window adaptation technique for non-stationary signals. We illustrate our
approach and the earlier one by addressing three time-frequency analysis
problems to show the improvements achieved by the use of optimal lattice and
window: close frequencies distinction, frequency estimation and SNR estimation.
The results are presented, when possible, with real world audio signals.
