Picture 1

10 seconds of continuous bat activity.

Picture 2

Seconds 1-3.3 of Picture 1.
0805-7b (1s, 8 kb mp3)
Regular pulse train, the sound frequency shows up in the last pulse at around 4 khz audio or (x16) 64 khz ultrasound. The pulse frequency is 13 in 2 seconds, or about 6-7 hz.

Picture 3

Seconds 3.4-3.8 of Picture 1.
A faster echolocation train. The pulse frequency picks up to 6 pulses in 0.3 seconds, or 20 hz.
The first pulse of this train shows a complicated structure.

Picture 4

Seconds 3.8-4.2 of Picture 1.
0805-7d (mp3, some silence appended to aid conversion)
The pulse frequency reaches a top speed of 20 pulses in .2 s or 100 hz.

Picture 5

Seconds 4.2-5.5 of Picture 1.
0805-7e (mp3)
The pulse frequency is back to a slower 7 hz and some good sounds can be heard jumping from 2.2 khz audio to 4.4 khz, corresponding (x16) to ultrasounds at 35 and 70 khz.