[PD] a phase vocoder pitch shifter harmonizer in real time

Alexandre Torres Porres porres at gmail.com
Tue Jan 10 07:48:50 CET 2012

sorry, what dont you get?

you're supposed to first hear the beatings and then the shift up anyway.

well, let me try with some oscilattors myself, that should be fun

see ya

2012/1/9 Charles Henry <czhenry at gmail.com>

> Hey Alex
> I'm just trying this out.  I didn't have a sound file I particularly
> wanted to try, so I just plugged in an osc~, and what I found on the
> output:  a mixture of the original tone with the shifted one.
> So, the shifted tone was clearly audible, but as I shifted the
> frequency, I could hear first the beating of the tones then two tones.
> And upon reading into the patch, that's clearly what you're doing in a
> subpatch, but I don't get why?
> Chuck
> On 1/9/12, Alexandre Torres Porres <porres at gmail.com> wrote:
> > Hi Folks,
> >
> > working with these phase vocoder stuff, I thought I'd try and do a simple
> > shifter/harmonizer with it once and for all. The phase vocoder shifter I
> > found in pdmtl doesn't work as a harmonizer, and the latency was pretty
> > high and not constant, so I did this. It's all as a Vanila abstraction!
> >
> > I have 2 short buffers (arrays) and do crossfade between them, I got some
> > phase issues trying out and building it, but they now seem reasonably
> fine.
> >
> > I just did this, so I should work more on it to make it more stable and
> > robust. I'm sure there are some bugs around, and it's still very dirty
> and
> > needs code cleaning. Maybe I should try and implement it with delay lines
> > as in pdmtl, hmmm, I guess it'd be better, right? Hmm... Later on when I
> > have the time...
> >
> > Anyway, this goes back to the Pd Shifting thread I started here a while
> > ago. I really like the quality of the phase vocoder. Somehow I don't get
> > interested so much on other techniques and such. Yes, I assume there are
> > some advantages out there, so what exactly would I be missing?
> >
> > Well, Check this thing I did out, see what you think, let's talk some
> more
> > about pitch shifting....
> >
> > get it here: http://sites.google.com/site/porres/pvoc-shifter.zip
> >
> > I wish to officially release it along with some other tools I'm building
> > for my PhD, soon to be over...
> >
> > by the way, I see this object is finally available
> > http://www.katjaas.nl/pitchshift/pitchshift.html need to try it out.
> >
> > cheers alex
> >
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