120000
110000
100000
90000
80000
10000
kHz
60000
50000
40000
30000
20000
10000
seconds
FIGURE 1.10. Spectrogram of the burst pulse signal of a Hawaiian spinner dolphin having only ultrasonic frequency components and no
audio frequency components. (From Au, Lammers, and Aubauer 1999.)
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n
...,
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('D"
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W