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Fig. 2. Power spectra of selected subharmonic and chaotic regimes of sound in
Fig. 1. (A) Subharmonics at
integer multiples of 0.5 fundamental frequency (f0). The
0.5 f0 component is low intensity and coincides with a
faint tonal artifact. (B) Chaos. (C) Subharmonics at 0.1
f0. Subharmonics that are fractional integers of
f0 are at a low level because of roll-off of the
ultrasonic microphone and some are masked in noise. Each power spectrum
represents a 5 ms segment of sound at the time indicated by vertical arrows a,
d and e in Fig. 1. Shaded peaks
below approximately 12 kHz did not arise from the frog, but are low-amplitude
tonal artifacts present in the recording even when sublaryngeal pressure was
at ambient level and no air was flowing through the frog's vocal system.
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