(updated March 2. 1998)
Signature Whistles ?
The following two samples are probably the acoustic signatures of the vocalizing pilotwhales.
Whistles which were produced every few seconds by free-ranging Globicephala mac., characteristic for signature calls.
Whistle 1, Duration = 0.95s
Analysis at 597ms: High number of harmonics
Wavesample from 525ms to 680ms shows amplitude modulation
Whistle 2 Duration= 0.75s
Analysis at 503ms
As shown in the spectrogram, many harmonic peaks get visible in this frequency analysis.
This whistle I would classify as non-signature whistle. This whistle contour appears in many variations of frequency and duration. The lower number of harmonics is significant.
Duration=0.85s
Analysis at 259ms
Peaks at approx. 4.3, 8.7, 13, 17.3 and 21.6 kHz
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Technical devices: B&K Hydrophone, Aiwa DAT Recorder 48 kHz
Software used: Sounddesigner II, CoolEdit, SpectraPlus, PaintShopPro
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