Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!munnari.oz.au!uniwa!scott
From: scott@psy.uwa.oz.au (Scott Fisher)
Newsgroups: comp.music
Subject: Time stretching/Pitch shifting
Message-ID: <1991Jun14.072209.20376@uniwa.uwa.oz>
Date: 14 Jun 91 07:22:09 GMT
Sender: news@uniwa.uwa.oz (USENET News System)
Distribution: comp
Organization: University of Western Australia
Lines: 22
Nntp-Posting-Host: wapsy.psy.uwa.oz.au

Can anyone point me to a good reference on real-time digital pitch
shifting.  You know, decoupling sample duration and the sample frequeny 
spectrum for independent pitch/time manipulation.  Without having to
resort to Fourier transformations if possible.

A general posting here or directly to me via email on the topic would be 
great too.

I am trying to write such a program my self, the one I have works
but is very noisy.  I am shifting a very short loop through a sample at 
various rates.  Loop play-back rate gives pitch and the rate at which the 
loop moves through sample gives duration.  Amplitude mis-match between 
loop start-end points is causing all the noise (glitching).

So should I "really" do this :-)

Thanks in Advance
Scott Fisher.
_________________________________________________________________________
scott@wapsy.uwa.oz.au                   Department of Psychology
                                        University of Western Australia.
_________________________________________________________________________