Figure 3

Chirplet representations of a bioacoustical signal. (a) Time-domain representation of the large brown bat echo-location signal (sampled at 0.14 MHz). (b) Spectrum of the signal (calculated with a 0.45 ms Gaussian window). (c) Time-frequency representation of the signal. (d) Chirplet decomposition of the signal (represented by five chirplets). (e) Wigner-Ville distribution of the signal (negative energies discarded).