Figure 3
Time-varying spectra of s1 and s2 and their coherence obtained from (a)–(c) the GT-spectrogram with the standard derivation of the Gaussian window σ = 0.05 s, (d)–(f) the GT-spectrogram with the standard derivation of the Gaussian window σ = 0.02 s, and (g)–(i) the ST-spectrogram. (a) Spectrum (Gabor) of s1 with scale σ = 0.05 s (b)Spectrum (Gabor) of s2 with scale σ = 0.05 s (c)Coherence (Gabor) with scale σ = 0.05 s (d)Spectrum (Gabor) of s1 with scale σ = 0.2 s (e)Spectrum (Gabor) of s2 with scale σ = 0.2 s (f)Coherence (Gabor) with scale σ = 0.2 s (g)Spectrum (Stockwell) of s1 (h)Spectrum (Stockwell) of s2Coherence (Stockwell)