Subject: Re: [linux-audio-dev] time-stretching filters (was: LADSPA Specs)
From: Paul Winkler (pw_lists_AT_slinkp.com)
Date: Sat May 11 2002 - 22:22:05 EEST
On Sat, May 11, 2002 at 11:03:08AM -0700, Lance Blisters wrote:
> > 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.
I think this is normally referred to as "resampling."
it's just a matter of choosing an interpolation algorithm,
optionally with an antialiasing filter if the new pitch is
higher than the old one.
"Time-stretch resampling" means extending the time without
changing the pitch, or tweaking the pitch and time independently,
and it's a lot trickier.
--Paul Winkler home: http://www.slinkp.com "Muppet Labs, where the future is made - today!"
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