Subject: Re: [linux-audio-user] Pitch shifting
From: Dave Phillips (dlphilp_AT_bright.net)
Date: Fri Feb 01 2002 - 17:14:25 EET
Steve Harris wrote:
> Its common to think of pitch shifting in octaves/semitones, so a
> +-12 semitone scale might be better. You could probably assume equal
> temprement:
>
> s = 2**(p/12) [s = pow(2.0f, p * 0.0833333333f); in c]
>
> where s is the scale coefficent and p is the pitch shift in semitones.
>
> Ofcourse I could make the LADSPA interface semitones if people preferred.
> I was thinking more of an SL2's +-n% when I wrote it.
Thanks for this information, Steve. I've forwarded it to Bill
Schottstaedt, hopefully we'll come up with a better representation in
that particular widget.
Best regards,
== Dave Phillips
The Book Of Linux Music & Sound at http://www.nostarch.com/lms.htm
The Linux Soundapps Site at http://sound.condorow.net
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