[PD] emulating early video synths - sync

Paris Treantafeles paris at parisgraphics.com
Thu May 4 17:59:51 CEST 2006

haha... i can't be the only one who has hit "send" then figured out  
the problem.

basically i wasn't really resetting the oscillators since sending a  
number to the right inlet of the oscillator wasn't enough.
once i added a metro and "banged" the input, the sync worked.

still... if there's anything that comes to mind regarding best block~  
to use, please feel free to share.


On May 4, 2006, at 11:48 AM, Paris Treantafeles wrote:

> Hello List,
> I've created a few patches with PD/GEM to emulate early video  
> synths such as the Sandin, etc. which I'm quite happy with.
> At the heart of these patches is pix_sig2pix~
> One thing I can't figure out though has to do with preventing the  
> image from "rolling" - i.e. to stand still.
> The early video synths did this by having a "sync" input to  
> oscillators.
> So if you fed one oscillator a vertical sync (~60 Hz) you would get  
> stationary vertical bars whose width would depend on the main  
> frequency of the oscillator. Doing this with another oscillator  
> receiving a horizontal sync (~1500 Hz) results in horizontal bars.
> By mixing these and perhaps another (and adjusting the attenuation  
> of these), various shapes appear.
> I can get all of this and more (e.g. add some filters for  
> subtractive synthesis) but what I'm missing is how to do the sync  
> correctly.
> Trying various values as reset inputs to say "phasor~" doesn't do it.
> I'm wondering if this is in fact related to blocksize~ instead.
> e.g. should the reset values of the oscillators be related in  
> someway to the value set in blocksize~
> Does anyone have any ideas about this?
> Thanks for any suggestions!
> Best,
> p
> _______________________________________________
> PD-list at iem.at mailing list
> UNSUBSCRIBE and account-management -> http://lists.puredata.info/ 
> listinfo/pd-list

More information about the Pd-list mailing list