Subject: Re: [linux-audio-user] recording bats?
From: Mark Knecht (markknecht_AT_gmail.com)
Date: Tue Nov 09 2004 - 23:44:56 EET
What an amazingly silly (and fun!) thread...
Well, obviously you're going to need a tried and true 'Bat Detector Pre-amp'...
http://home.kabelfoon.nl/~bertrik/bat/preamps.htm
What it appears he did was to use an audio range microphone and then
tune the preamp to only amplify very high audio frequencies. I.e. -
build a 100KHz pream with a high-pass filter at 30-40KHz...
I didn't think you could have paid me to participate in this one... ;-)
- Mark
On Tue, 9 Nov 2004 16:26:11 -0500, Eric Dantan Rzewnicki
<rzewnickie_AT_rfa.org> wrote:
> On Tue, Nov 09, 2004 at 11:58:54AM -0800, Erik Steffl wrote:
> > mik wrote:
> > >a certain jonathan segel <jsegel_AT_magneticmotorworks.com> wrote:
> > >>if you do end up recording bats, and slowing them into audio range, i
> > >>for one would like to hear the files!
> > >http://www.partnersinrhyme.com/soundfx/batsounds.shtml
> > you (original poster, I don't have the first post anymore) might also
> > consider other animals - small rodents, cats. Cats hear up to about
> > 60kHz (that's what I remember, even if it's not the right number they
> > hear a lot higher frequencies than we do), it was explained in the book
> > I read that that's what they need to be able to hear the small rodents
> > (so I guess small rodents emit sounds up to about 60kHz), plus cats use
> > higher frequencies to communicate among themselves (that's why you only
> > hear them doing the meow sounds when they are around humans).
>
> Ah!! very, very interesting. We have 4 cats. Communication above our
> hearing range would explain alot about how they all seem to notice some
> things at the same time and other collective behavior. And here I was
> thinking they were telepathic. I'm glad I asked my original question. :)
>
> -Eric Rz.
>
This archive was generated by hypermail 2b28 : Tue Nov 09 2004 - 23:50:10 EET