[PD] FM feedback synthesis issue

[Roman Haefeli]

hi daniel

can you tell us where you found the referring theory? does the theory
mention the delay in the feedback line? since you only can achieve a
feedback loop by using a [s~]/[r~]-pair you normally get a delay of 64
samples in pd.you can de-/increase this value by setting a different
block size with the object [block~]. i can only assume, but i think in
such an unstable system the delay may plays an important role. 

roman


On Mon, 6 Mar 2006 12:33:23 -0500
"mami music" <mami.music at gmail.com> wrote:

> Hi.
> im simulating  single carrier FM feedback. Im modulating the pitch of an
> osc~ with it´s own output:
> *Im multiplying the output of the osc~ with a fader that goes from 0 to
> 1000.
> *Thar result im adding with a fixed frequency.
> *and then back to the main freq of the osc~ object
> 
> this is very simple, according to theory i should get an increase in the
> partials (which im getting), but im also getting a pitch shift in the main
> freq of the oscilator as i expand the amplitude of the feedback!!!
> I can´t see why this is happenig, i think it is not supposed to happen. Can
> ayone explain to me why this is happening and how can i avoid it?
> 
> thankz
> 
> daniel gomez
>