[PD] Video synthesizer emulation

tim vets timvets at gmail.com
Thu Jul 12 20:02:03 CEST 2012

[sig2pix~] ?

2012/7/12 Off Screen <offscreen at personalreport.it>

> Hello everybody,
> I'm trying to emulate an analogue video synthesizer using GEM. My starting
> point is the LZX system, an old school analogue video synth which has been
> rebuilt today using modern circuitry components. Obviously that wonderful
> tool is way too expansive for me so I thought I could build something
> similar using Pd.
> My first goal is to succesfully emulate the Video Waveform Generator:
> http://www.youtube.com/watch?v=pbpFgvttBZw
> Here is a detailed description:
> http://www.lzxindustries.net/modules/video-waveform-generator
> I've tried to use [pix_sig2pix~], it works quite nicely and the patterns I
> get are almost identical to the ones in the video (including all the fm and
> pwm stuff). The problems are in the second part of the video, when they use
> high frequencies (~ 3mhz) to generate vertical bands. I'm pretty sure I
> can't use the same approach with Pd.
> The other option would be to use GLSL shaders, but it has two major
> drawbacks: first, it won't be using raw signal but control messages (no
> sound generation); second, it won't be patchable, once the parameters are
> converted into an image all the informations about frequencies are lost and
> I won't be able to use it to modulate another shader.
> I'd like to know from somebody who has much more experience than me what
> would be the best approach. Are there any limitations or constraints within
> the [pix_sig2pix~] object or Pd itself that I should be aware of? Any
> advice will be extremely appreciated.
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