Re: auditory scrambling

[Ursula Kirmse <ukirmse@xxxxxxxxxxxxxx>]

Hi Mathias,

I also did this a while ago, when I tried to find a way to make sounds 
unrecognizable. However, it didn't use it later because it didn't make 
sense for my stimuli.
What you have to do is, to read the wav-file in Matlab and than 
transform the data vector you get in a matrix with as many columns as 
you need segments (each with so many data points as the length of the 
segment is supposed to be according to the sampling rate of your 
stimuli). You might need to add zero-value data points at the end of 
your signal to have a vector length that is separable by your number of 
segments. You can than sort the columns randomly and resample the sound. 
However, you will  probably get distortions as the signal is not cut at 
zero-crossing points. It will depend on your stimuli and the way you 
want to use them whether you will need to find a a way to avoid this.

If you like I can have a look for the script.

Best, Ursula

--
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Ursula Kirmse, Dipl.-Psych.
Ph.D. Student
University of Leipzig
Cognitive & Biological Psychology
Institute of Psychology I
Seeburgstrasse 14-20
04103 Leipzig, Germany
Phone +493419735978
Fax +493419735969
http://www.uni-leipzig.de/~biocog/
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