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Figure 1


Fig. 1. Spectrograms of the echolocation-call sequences with the time-variant peaks (A,B) and notches (C,D). To the left of A and C is the spectrogram of the unfiltered FM sweep consisting of F0 (23 to 19 kHz) and four harmonics with a duration of 1.5 ms. A and B show the echolocation-call sequences to be discriminated for the time-variant peak detection. C and D show the echolocation-call sequences to be discriminated for the time-variant notch detection. All echolocation-call sequences have a modulation depth of 40% of the centre frequency (CF) and a modulation rate of 16 Hz, which results in an overall duration of 125 ms.