[sdiy] Sine VCO - tri to sine converter

[Czech Martin]

Like always in life, it depends on what you do.

I may need some sine for four quadrant multiplication,
aka ring modulation. You get already a lot of 
dirt from the ideal operation, so it would be good if
the sine is as clean as possible.

Also it could be interesting to use the sine for measuring
purposes.

As far as the speakers allow, it is interesting
to have a clean sine as well. It sounds - different.
Perhaps the speaker distortion sounds different that the
oscillator residual distortion.

So it is not useless nor stupid.

I like the sound of allmost ideal sound (e.g. c-sound).

m.c.

-----Original Message-----
From: Tim Ressel [mailto:madhun2001 at yahoo.com]
Sent: Samstag, 29. März 2003 18:30
To: Richard Wentk; synth-diy at dropmix.xs4all.nl
Subject: RE: [sdiy] Sine VCO - tri to sine converter


Yo,

Richard maked an excellent point here. I keep falling
into my "HP-lab-perfect" mode and try to make
everything as sterile as possible. But this is
subtractive synthesis: harmonically-rich waveforms are
filtered to create timbres. If your ramps are as
curve-free as Catherine Zeta-Jones, and your filters
are as clean as rap lyrics, so what? 

I have learned something recently: what is important
is that our circuits are **Well Behaved**. The VCA has
no bumps or pops, the filters don't wig out past 6
volts, that kind of thing. 

Also, it's important to HAVE FUN!!!! 

So get to it.

--Tim

--- Richard Wentk <richard at skydancer.com> wrote:
> At 15:40 28/03/2003 +0100, Czech Martin wrote:
> >After some experience even 0.1% THD is audible.
> 
> But not necessarily objectionable. Musically and
> audibly there's a lot to 
> be said for imperfect waveforms! I can't think of
> many applications where 
> you absoluetly have to have a test-equipment quality
> sine for a patch to 
> work. FM comes closest because any extra harmonics
> will smear out the 
> timbre once you started piling on the Bessels, and I
> suppose the quadrature 
> osc in a frequency shifter needs high accuracy. But
> other than that, as a 
> standard patch element even as much as a couple of %
> of THD doesn't sound 
> too painful.
> 
> In fact that's part of the grungeyness of the
> analogue sound. If you make 
> some squeaky-clean digital sines in something like
> Csound, they usually 
> sound too perfect to be musically interesting and
> you get that shiny 
> fingernails-on-blackboard digital sound instead.
> 
> Richard
> 
> 


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