making a sound unrecognizable

[Ursula Kirmse <ukirmse@xxxxxxxxxxxxxx>]

Dear list members,

I'm looking for a possibility to change/edit a environmental or at least 
natural sound in a way  that it is not any longer recognizable as what 
it is, but, however, for doing this with changing as less acoustic 
parameters as possible. ;-)  The intention is to use these sounds in a 
MMN paradigm and it is important that  both "versions" of the sound are 
acoustically as similar as possible.
The main point is that the sound (that can also be a more complex thing 
as the sound of a barking dog or a something like that) should be not 
possible to be recognized as what it is.

I would be very happy about ideas or would like know if maybe somebody 
has already tried something like this?  I would also be very happy about 
recommations for software or matlab scripts that could be helpful in 
respect to this. For example I'm looking for a way to transfer the 
amplitude envelope from one sound to another (I already wrote a matlab 
routine for this, but its not yet functioning perfectly fine and the 
result is not completely convincing).

So if anybody has a an idea I would be grateful.

best regards and thanks a lot,
Ursula Kirmse

--
--------------------------------------
Ursula Kirmse
University of Leipzig
Cognitive & Biological Psychology
Institute of Psychology I
Seeburgstrasse 14-20
04103 Leipzig, Germany
Phone +493419735978/Fax +493419735969
--------------------------------------