[sdiy] Smith's Evolver Desktop's spikey VCO waveforms

Michael Zacherl sdiy-mz01 at blauwurf.info
Thu Jun 6 18:08:49 CEST 2013


On 6.6.2013, at 09:39 , Mattias Rickardsson wrote:

> Den 6 jun 2013 01:24 skrev "Michael Zacherl" <sdiy-mz01 at blauwurf.info>:
> >
> > yeah, I think the triangle is the only shape where this glitch can be heard.
> 
> The triangle is a soft waveform without discontinuities, so even a much smaller glitch than the one you showed will be heard easily.
> 
> > but the 'normal' notches on triangles I know are right on the tip of the wave and (IIRC!) symmetric on both halves.
> 
> The ordinary simple way of constructing the triangle from a rectified sawtooth gives this glitch (if nothing more is done to prevent it). It's just on the tops OR the bottoms though!

alright, so I didn't recall correctly - thanks.
I just looked up some schematics to refresh my memory.

> Regarding the other waveforms, I don't know what could possibly cause glitches in them. But it's not as critical soundwise.

of course, and it's the triangle wave where he became aware that something's wrong.

m.

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