[PD] Why does cross synthesis with [expr~] sound much better than [poltocar~]?

Reed Perkins reedperkins32 at gmail.com
Wed Jul 22 19:09:16 CEST 2015

Thanks I was indeed using 0.43. Also, I didn't know what deken was. So
cool! Thanks for your help.


On Tue, Jul 21, 2015 at 12:39 PM, Alexandre Torres Porres <porres at gmail.com>

> it's been corrected in the new cyclone library, that you can download with
> the deken plugin, and it was working just fine with pd extended 0.42, so
> it's a pd extended 0.43 thing
> I was actually the one who raised it up an issue with both poltocar~ and
> cartopol~, that the signs were inverted. It actually worked fine for
> spectral processing, even though it wasn't correct. But then only one of
> the objects were corrected in 0.43 and everything was ruined :) it was
> better before
> 2015-07-21 15:35 GMT-03:00 Alexandre Torres Porres <porres at gmail.com>:
>> if you're using pd extended 0.43, there's a bug that just ruins everything
>> 2015-07-21 15:11 GMT-03:00 Reed Perkins <reedperkins32 at gmail.com>:
>>> Hello list,
>>> I am trying my hand at some basic FFT stuff. I am designing a cross
>>> synthesis patch (see attached) where the amplitude from one signal is
>>> combined with the phase of another signal and fed into [rifft~].
>>> The problem is that the polar to cartesian conversion using [poltocar~]
>>> sounds really bad. I worked out the trig formulas for what is going on, and
>>> found that using [expr~] to handle to polar to cartesian conversion sounds
>>> much better.
>>> Although I am happy with the [expr~] results, I am worried that I am not
>>> using [poltocar~] correctly, or understanding how to use it.The help files
>>> are very vague when it comes to the FFT objects in pd, so I was wondering
>>> if someone here could enlighten me as to what I'm doing wrong.
>>> Thanks and have an awesome day!
>>> -Reed
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