[sdiy] dsPIC pitch shifter

Jim Credland jim at cernproductions.com
Wed Jun 15 17:34:38 CEST 2016


That's impressive to get running on a dspic ... how big is your autocorrelation window? 

On 15 Jun 2016, at 15:06, 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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> 
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