Picture 1

0723-2 sound (3.2s, 26 kb mp3).


Picture 2

Each pulse appears to be a composite of 3 tight pulses.


Picture 3

Looking closer, 3 components of a single pulse are clearly distinct.


Picture 4 -- Time axis in audio samples, 32000 samples = 1 sec

Closeup of the central of the 3 sub-pulses.

At a sampling rate of 32000 samples/sec, 100 samples 100/32000 = .003125 seconds. Between samples 50 and 150 there are approx. 7 cycles, so the dominant frequency in that region is 7/.003125 = 2240 hz. The detector divides by 16, so the bat is actually emitting at 16*2240 = 35840 hz. This also agrees with the sonogram, as it should.