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Spatio-Temporal Patterns of Beaked Whale Echolocation Signals in the North Pacific

Figure 1

Overview of frequency-modulated (FM) upsweep pulses from known (I–IV, VII, IX) and unknown sources (V, VI, VIII, X,).

Each FM pulse type is shown with an example pulse time series (top) and spectrogram (middle, Hann-windowed 2 ms, 40-point DFT, 97% overlap), as well as a mean spectra (bottom, solid line) over all FM pulses from several acoustic encounters and mean noise (dotted line) extracted before each pulse. Inter-pulse interval (IPI) is specified in ms (value in time series plot).

Figure 1

doi: https://doi.org/10.1371/journal.pone.0086072.g001