Subject: [linux-audio-dev] time-stretching filters (was: LADSPA Specs)
From: Lance Blisters (geoff_AT_lek.ugcs.caltech.edu)
Date: Sat May 11 2002 - 21:03:08 EEST
> I think the time-stretching plugin is a very legitimate example
I'm looking for a decent-sounding time-stretching algorithm.
can anybody recommend one?
By time-stretching i mean resampling to any rate, changing
the audio speed with the corresponding shift in pitch, just
like changing the speed of a turntable. GDAM has a plugin for
this (quick and dirty, double-or-drop samples as necessary to
achieve the desired rate) which sounds good on many songs, but
induces a lot of ringing on pure sine waves or when playing at
really slow speeds.
I'd also be interested in the pitch-invariant type of time-strecth
filter, if anyone has an implementation which sounds better than
the blind overlap-and-crossfade approach we use in GDAM's respeed
plugin.
-geoff
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