[PD] Analog square wave?

[Peter Plessas]

* chris clepper <cgclepper at gmail.com> [2012-02-06 15:49]:
> In an analog synth the square wave has some distortion to it: the rise is
> not instantaneous and there is some overshoot of the peak too.  Over the
> years this was minimized by using high slew rate amp circuits and the like
> so an old Moog pulse wave is less ideal in shape than a new one.
> 
> For a digital square wave you would want to use band limiting to avoid
> alias artifacts which are quite severe for a square or sawtooth wave.  As
> the frequency goes higher both of those waves will begin to look more like
> sine waves as the partials are filtered out.  Pretty much every commercial
> digital synth and plugin uses anti-aliased waveforms.

out of interest Chris, do they use wavetables (possible of different
lengths for different octaves) or internal oversampling a la Millers
example in the doc patches?

best, P

> 
> On Mon, Feb 6, 2012 at 8:31 AM, Pierre Massat <pimassat at gmail.com> wrote:
> 
> > Dear List,
> >
> > I need a square wave to use as an LFO in a ring mod patch. Though i could
> > simply use [expr~ $v1>0.5], I m wondering if I could get a smoother square
> > wave. I tried to use a bandlimited square wave, but I don't have enough
> > harmonics and the top of the wave isn't flat enough. Incidentally, what do
> > analog square waves from old synths look like? Anyway, I think i want a
> > square wave with no jumps between 0 and 1.
> >
> > Cheers!
> >
> > Pierre.
> >
> > _______________________________________________
> > Pd-list at iem.at mailing list
> > UNSUBSCRIBE and account-management ->
> > http://lists.puredata.info/listinfo/pd-list
> >
> >

> _______________________________________________
> Pd-list at iem.at mailing list
> UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list