Path: utzoo!attcan!uunet!samsung!zaphod.mps.ohio-state.edu!tut.cis.ohio-state.edu!usenet.ins.cwru.edu!cwsys2!dkazdan
From: dkazdan@cwsys2.cwru.edu (David Kazdan)
Newsgroups: sci.electronics
Subject: Re: sensory substitution
Summary: Eavesdropping on bat sonar--film from Harvard
Message-ID: <1990Feb7.135238.11942@usenet.ins.cwru.edu>
Date: 7 Feb 90 13:52:38 GMT
References: <1990Feb5.162926.3877@pcsbst.pcs.com>
Sender: dkazdan@cwsys2.cwru.edu (David Kazdan, M.D.)
Organization: Dept of Systems Engineering, Case Western Reserve U., Cleveland, OH
Lines: 21



Question was posted about eavesdropping on bat sonar...

No, I don't know a lot about it except that it is mostly <40 KHz and
fairly high amplitude.  What I do know about (that you may be interested
in) is that one of Harold Edgerton's Harvard students (Doc was at MIT right
up until his death a month or so ago) did a stroboscopic film of bats
that included a real-time soundtrack.  I think that he did it by slowing
the tape at the same rate as the image, so pitch and speed came down together;
he must have had a very wide-bandwidth tape recorder.  There may have been
some heterodyning involved.

At any rate, several of the Strobe Alley workers of that era are still
around the lab, and a letter to them may prove fruitful (fruit bats and
all...all right, weak pun.  But did you see the article on vampire bats'
cooperative behavior?  Current Scientific American...a fascinoma).

73,

--David