[PD] Video synthesizer emulation

tim vets timvets at gmail.com
Thu Jul 12 20:03:39 CEST 2012

2012/7/12 tim vets <timvets at gmail.com>

> [sig2pix~] ?
> sorry, that shoulld be: [pix_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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