The Humpback Whale songs repeat in cycles of anywhere between ten and thirty minutes. Individual Whales have been documented as singing continuously for up to twenty four hours. The Whales each sing the same cycle, although they each commence the song cycle at different intervals. So a low frequency pulse may be responded to by a high frequency pulse giving them Sonar (Sound Navigation and Ranging) feedback on each other’s position. We base our cycle timing of the whale song on the crescendo to the high frequency pulses. Note the subtle but definite descent in frequency of each of the passages syncopated by low frequency staccato pulses. Viewed with a spectrogram the low frequency pulses can be seen to be very precise chords of frequencies.
Posted on: Sat, 13 Sep 2014 13:24:37 +0000
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