Gabor transform
The feature of Generalized spectrogram is that the window sizes of formula_10 and formula_11 are different. Since the time-frequency resolution will be affected by the window size, if one choose a wide formula_10 and a narrow formula_10 (or the opposite), the resolutions of them will be high in different part of spectrogram. After the multiplication of these two Gabor transform, the resolutions of both time and frequency axis will be enhanced.