Raimund:
Awesome! What kind of microphones did you use? And what accounts for the
echo/reverberation that I hear especially to one side? Is this the calls
reflecting off a hard surface?
Lang
p.s. My SongFinder Plus has a heterodyne mode that currently extends to 40
kHz. I can hear a number of bat sounds with the unit. The headset is
binaural, so I can look in the direction of an incoming bat and then see if
fly by in the twilight. Right now I believe it's the only device that allows
a person to hear bats in real time binaural.
http://www.naturesound.com/songfinder/plus.html
Hi,
I just want to share some of the stereo bat sound recordings that I made
from my balcony last night.
I used a sound activated PC-based recording set-up that registered all bat
passings during the night. Here are some of these recordings (European
Common Pipistrelle, Pipistrellus pipistrellus):
http://www.avisoft-saslab.com/sounds/stereo/pipistrelle1.mp3 (both
echolocation and social calls, 326KB)
http://www.avisoft-saslab.com/sounds/stereo/pipistrelle2.mp3 (echolocation
calls, 173KB)
http://www.avisoft-saslab.com/sounds/stereo/pipistrelle3.mp3 (echolocation
calls, 1186KB)
The two ultrasound microphones where placed close together (about 2 inches).
The angle between them was about 30 degree (these microphones are relatively
directional). There is a wall in front of my balcony that produced the
strong echoes on the right channel.
The initial sample rate was 250 kHz (recorded using Avisoft-UltraSoundGate
416). I have then set the sample rate in the file headers to 11.025 kHz,
which provides a time-expansion factor of about 22.
Regards,
Raimund Specht
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