Audio and accelerometer spectrograms of SEP2 calls.

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Audio and accelerometer spectrograms of SEP2 calls. Audio and accelerometer spectrograms of SEP2 calls. (A) Acoustic waveform and spectrogram of a complete SEP2 call recorded during deployment bm14_082b consisting of pulsed components A2, B2, C2 and D2 as well as both high-frequency precursors (‘Pre-A2’ and ‘Pre-D2’; Buchan et al., 2014). The next two sections of the figure contain the acoustic waveform and spectrogram in the upper two panels, and spectrograms of the accelerometer's three orthogonal axes in the lower three panels. (B) SEP2 call from deployment bm15_064a interrupted by the tag breaking the water surface; A2, C2 and D2 components register clearly on the accelerometer spectrograms. (C) Faint and incomplete SEP2 call from deployment bm15_064a overlapped by short calls and surfacing noise. The A2 component registers a concurrent acceleration signal that is overlapped by the acceleration signals associated with the series of short calls. In all spectrograms, the wide vertical bands indicate when the DTAG is above the surface of the water. Narrower vertical bands are signals from the VHF antenna on the tag. Spectrogram parameters for all panels are: 256-point FFT, Hamming window, 99% overlap. Mark R. Saddler et al. J Exp Biol 2017;220:4119-4129 © 2017. Published by The Company of Biologists Ltd