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From: limey@cs.mcgill.ca (Mark ORCHARD-WEBB)
Newsgroups: sci.electronics
Subject: Re: audio jamming
Message-ID: <1991Feb21.091634.29010@cs.mcgill.ca>
Date: 21 Feb 91 09:16:34 GMT
References: <332@nachos.SSESCO.com> <1991Feb20.221058.15270@limbic.ssdl.com>
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    This little debate has brought back the memory of a most enjoyable
solution I found to a similar problem.  The method I used to retrain
a loud neighbour was to install a pizoelectric transducer in his 
ceiling (he was directly below me, it often seemed he kept his LS
lying on their backs as in the Beethoven's 5th torture scene in
Clockwork Orange)  These transducers can be capable of 100dB SPL at 
high frequencies.  The transducer was hooked upto an amplified
oscillator at around 17KHz.  When the offending music becomes intolerable
turn it on.  The beauty of it is that due to the already high SPL
in the guy's apt he does not appreciate it as a foriegn sound but rather
as pain (I find the sensation somewhat of a creeping pressure on the
scull).  I having 6 inches of wood flooring was reasonably isolated
from the high frequency but he was only 1 inch of plaster away from it
so it was quite effective.  Better yet he seemed to think that it was 
his sound system at fault since I saw him hauling various parts out
on different occasions after the retraining began.  Eventually I hooked 
the thing up to respond linearly to the SPL in my apt while I was away.
Sure enough after a few months, as with the little white rat, my
neighbour learned that socially deviant behavior was related to pain
and his behavior was modified.
    A few notes:  The frequency of the oscillator should be just above
             the range where it is an identifable sound just a sensation.
                  Please do not do this around animals I am sure that this
             will cause them much more distress than the original noise.

Mark, (sometimes refered to by fellow physists as pscho.)


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