Subject: Re: [linux-audio-user] extreme time stretching
From: derek holzer (derek_AT_x-i.net)
Date: Tue Mar 16 2004 - 02:09:17 EET
Doing some quick experiments with Soundtouch, I hear that it probably
isn't going to work for "extreme" timestretching. Even doubling the
length of a 4 minute soundfile results in *very* noticeable artifacts...
a kind of stuttering effect as the samples get pulled apart. You won't
be making a 24 hour Beethoven stretch with this one...
Seems like an FFT-based approach, or a very good synchronous
granulation, might be better. Pure Data has a nice phase vocoder demo
patch in its documentation. You'll have to fiddle with it to get stereo,
of course. But hey, it's only a help patch! ;-)
Other option is the Synchgrain external for PD, as I might have
mentioned earlier. I haven't tested the limits of it yet, but I know
that it sounded smooth at pretty slow playbacks.
d.
-- derek holzer ::: http://www.umatic.nl ---Oblique Strategy # 173: "Voice your suspicions"
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