I have made some recordings of bat echolocations using a simple "bat
detector" (http://home.netcom.com/~t-rex/BatDetector.html
<http://home.netcom.com/~t-rex/BatDetector.html> ). It does a great job
of picking up the ultrasonic sound of your fingers rubbing together -
you can hear the ridges in your skin rubbing, which is amazingly loud in
the ultrasonic range.
However I have never tried listening to anything with the detector
pressed against my skin. In the name of science, I will give it a try
tonight and see what I can find. Hopefully I won't hear any strange
voices :-).
The detector does pick up the sound of liquid going through a
constriction - I have heard water pipes buried deep under a street.
It is also a lot of fun to just go around the house/neighborhood to see
what ultrasonic sound you can find.
Note that this is a very simple ultrasonic detector, it just generates
is a series of clicks. There are of course much more sophisticated
devices.
I'll post tomorrow with the results of my "exam".
Dave
"Microphones are not ears,
Loudspeakers are not birds,
A listening room is not nature."
Klas Strandberg
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