Re: [linux-audio-dev] New release of my plugins

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Subject: Re: [linux-audio-dev] New release of my plugins
From: Steve Harris (S.W.Harris_AT_ecs.soton.ac.uk)
Date: Sun Dec 03 2000 - 13:45:27 EET


On Sat, Dec 02, 2000 at 10:34:30PM -0500, Paul Barton-Davis wrote:
> >> Anyway Steve can you tell us more about your pitchshifter (the HQ version):
> >>
> >> how does it sound on +-20% pitch transpositions ?
> >
> >You tell me, my working-in-linux soundard is terrible! In theoru it
> >should be good, (its an algorithm used in high end hardware/software).
> >Early next year I plan to get an RME for home, then I can actualy tune
> >these plugins properly.
>
> I'm not sure how much impact your soundcard has. For me, both the
> pitch shifters are not particularly good as transposers in that they
> cause substantial alterations in the timbre of the sound, not just the
> pitch. compared to the very-non-real-time stuff done by the SCRIME
> guys (Inspect is the s/w), its really awful. Compared to what by
> Quadraverb does, its fine. I've always viewed these things as
> colorants as well as shifters - transposition needs to be done via a
> different mechanism (hence the excitement about Acid when it came out).

Well, that algorithm is supposed to scale the harmonics proportianly to the
fundamental, and it preserves phase, but I suspect that the coarse FFT,
and small oversample I have to use to get it running in realtime causes
a lot of problems. Writing a good pitchshifter requires a lots of maths,
and I just don't know enough to do it, and there's no shortage of off-line
pitchshifters out there.

It all depends on what you want from a pitchshifter really. It sounds a lot
like the one in my lexicon multieffect, but I only ever use them to mess
up harmonics myself. Maybe I just need a good one ;)

My soundcard is noisy and it distorts slighty and muddies up the sound a
lot. It's an antient SB16, I could probably help a lot by just bunging in
something which isn't 4 or 5 years old.

- Steve


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