[sdiy] dsPIC pitch shifter

[Vinicius Brazil]

Great job Richie!

On Wed, Jun 15, 2016 at 11:17 AM, Chris McDowell <declareupdate at gmail.com>
wrote:

> Yeah, great job! Sounds very clean and natural. Are you using a codec for
> audio in and out?
>
> Chris
>
> > On Jun 15, 2016, at 9:06 AM, Eric Brombaugh <ebrombaugh1 at cox.net> wrote:
> >
> > Great work Richie! Sounds fantastic.
> >
> > I've done 2-pointer pitch shifters in just about every CPU architecture
> that I've ever used but the AM effects from simple cross-fading make them
> sound pretty awful. Autocorrelation and AMDF pitch detection are on the
> list of "things I'd like to get around to eventually" but so far haven't
> tackled. You've set the bar high here.
> >
> > Eric
> >
> >
> > On 06/15/2016 06:50 AM, Richie Burnett wrote:
> >> Been playing about with pitch-shifting using a dsPIC33FJ128GP802.
> >> (Think monophonic pitch-shifter like the early Eventide Harmonizers.)
> >> Have posted some results here:
> >>
> >> http://www.richieburnett.co.uk/temp/pitch/
> >>
> >> Uses autocorrelation to continuously search for the best splice points
> >> in real time.  Formant positions aren't preserved so speech eventually
> >> tends towards chipmunk or Satan if you shift too far in either
> direction.
> >>
> >> -Richie,
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