Time-frequency distributions: a modification applied to the pseudo-Wigner-Ville distribution and the spectrogram

The spectrogram and the Wigner-Ville distribution are reviewed as methods for time-frequency analysis of nonstationary signals. The modification to the spectrogram of K. Kodera et al. (see Phys. Earth Planetary Interiors, vol.12, p.142-150, 1976) is applied to the pseudo-Wigner-Ville distribution (PWD), and a comparison is made between the spectrogram and the PWD, with and without modification, using numerical examples. The optimum time-frequency analysis tool is shown to depend on the nature of the input signal. The modified spectrogram is seen to be a credible alternative to the PWD.<>