[sdiy] dsPIC pitch shifter

[Eric Brombaugh]

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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