Any success with realtime pitch shifting?

#1

Hi all,
I've been scouring the forum for patches that succeed at pitch shifting in real time. Looks like the idea has come up quite a few times without much in the way of a resolution. Has anyone managed it over the last few years? fx/clds, Factotum and PitchshifterHQ produce fairly wild, glitchy and rhythmic outputs for me on even a clean saw wave.

I'm basically hoping to find a method to get +/- an octave on a middle C tuned sound source without massively distorting the source input. Would be a really entertaining way to work with different sound sources. Ideally there would be a method with enough headroom for polyphony. I'm assuming I'll have to tune each note individually and assign each to a midi note.

#2

I think the pitch shifting objects that are in Axo library are all delay based, which can be fairly "wild" as you describe it. And obviously also add some delay.

More precise pitch shifting can be done in FFT domain, which is a lot more complicated and cpu hungry.

So I think in Axo world some trade offs is to be expected. There are probably people in here that could make something better, but personally I am not able to.

If you want to play around with delay based pitch shifting yourself, take a look at the tutorial called "22_overlap_add_shifter.axp". It's not directly pitchshifting as it is, but the idea is very close. Experiment a bit and see what you can come up with :wink:

#3

Thx mate, you know I've had this thing for a while now and never noticed the tutorials! Missed that detail in the manual somehow.

pitchshifter2 works well for shifting up but not down weirdly so halfway there. if I get results I'll post em for the archives