pitch shifting algorithm (flatmax )

Subject: pitch shifting algorithm
From:    flatmax  <flatmax(at)CSE.UNSW.EDU.AU>
Date:    Wed, 14 Mar 2001 00:28:27 +1100

Hello, I am involved with a group of musicians called 'Elefant Traks' who are based in Sydney Australia. One member of the Elefant Traks team have produced what was the first web jamming software called 'Dase' it can be freely downloaded from : http://www.singularity.net.au/dase/dase.htm This software requires a good pitch shifting algorithm ... time/frequency scale modification .... Can anyone out there suggest algorithm references ? I was originally thinking of resampling the frequency spectrum based on frequency warping ... i.e. transforming the fft of the signal into the perceptual 'pitch' domain and resampling ... then reverse transforming, but I believe this may induce group phase errors ... any thoughts ? thanks Matt

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DAn Ellis <dpwe@ee.columbia.edu>
Electrical Engineering Dept., Columbia University