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Localisation of an acoustic signal in a noisy environment: the display call of the king penguin Aptenodytes patagonicus

Thierry Aubin^1,* and Pierre Jouventin²

¹ CNRS-NAMC, UMR 8620, Université Paris-Sud, F-91405 Orsay Cedex, France
² CNRS-CEFE, UPR 9056, 1919 Route de Mende, 34293 Montpellier, France

View larger version (34K): [in a new window]   Fig. 1. Spectrograms (top) and oscillograms (bottom) of signals broadcast to king penguin chicks to test their ability to localise the display call of their parents. (A) Natural (control) call; (B) call without amplitude modulation; (C) call with only the fundamental (baseline) frequencies kept. Colors, from blue (cold) to red (hot), represent increasing levels (in dB) of amplitude.

View larger version (37K): [in a new window]   Fig. 2. Spectrograms of the first syllable of a king penguin call repeated 1 (A), 2 (B), 4 (C) or 8 (D) times. Colors, from blue (cold) to red (hot), represent increasing levels (in dB) of amplitude.

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