FW: [sdiy] saw to tri/sine options

[Jerry Gray-Eskue]

Hmm <<2 * the Fundamental of the Ramp?>>
should have been 1/2 the Fundamental of the Ramp?

-----Original Message-----
From: Jerry Gray-Eskue [mailto:jerryge at cableone.net]
Sent: Monday, June 01, 2009 11:19 PM
To: Kyle Stephens
Subject: RE: [sdiy] saw to tri/sine options


<<They are just a transfer function of voltage in to voltage out. - Mark
Verbos>>

This would mean that a Ramp or Saw wave would generate the sine during the
ramp of the waveform in but when the wave resets the sine would also rest.
At the moment of reset the sine would be at its peak. Assuming a ramp
from -5v to +5 you would see a sine waveform starting at its negative peak
traveling through 0v and up to its positive peak then abruptly flipping its
polarity to negative. On an oscilloscope this would look much like a ramp,
but the slope would be the s of a sine wave shape. The frequency content
during the slope would be the same as a pure sine wave But there would only
be a half cycle of the sine to each full cycle of the ramp.

So the question is what would the frequency spectrum of this wave be?

2 * the Fundamental of the Ramp?
equal to Fundamental of the Ramp?
Somewhere between the spectrum of the ramp and a sine wave?




-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl]On Behalf Of Kyle Stephens
Sent: Monday, June 01, 2009 10:25 PM
To: synth-diy at dropmix.xs4all.nl
Subject: Re: [sdiy] saw to tri/sine options



A little out of idle curiosity (and to better under stand how the concept
works), what happens when you put a non-triangle wave through a tri to sine
waveshaper?

Say you use a saw, does that get you a halfway-there sine? By my same
possibly misplaced logic, would a square wave not be affected much, if at
all?

I at least haven't seen something like that before, so guess the results
aren't all that interesting?


_Kyle

--- On Mon, 6/1/09, mark verbos <mverbos at earthlink.net> wrote:

> From: mark verbos <mverbos at earthlink.net>
> Subject: Re: [sdiy] saw to tri/sine options
> To: "Synth DIY" <synth-diy at dropmix.xs4all.nl>
> Date: Monday, June 1, 2009, 5:17 PM
> These are essentially time
> independent. They are just a transfer 
> function of voltage in to voltage out. So, perfectly. I
> would think.
>
> Mark
>
>
>
>
> On Jun 1, 2009, at 6:07 PM, Jerry Gray-Eskue wrote:
>
> >
> > I am curious, How well do these hold the waveform peak
> to peak 
> > voltage and
> > sine wave shape from low to high end frequencies?
> >
> >
> >
> > -----Original Message-----
> > From: synth-diy-bounces at dropmix.xs4all.nl
> > [mailto:synth-diy-bounces at dropmix.xs4all.nl]On
> Behalf Of mark verbos
> > Sent: Monday, June 01, 2009 4:14 PM
> > To: Scott
> > Cc: Synth DIY
> > Subject: Re: [sdiy] saw to tri/sine options
> >
> >
> >
> > On Jun 1, 2009, at 4:37 PM, Scott wrote:
> >
> >> I'm trying to pick out a saw to tri/sine converter
> for a VCO I'm
> >> building (j.h.living).  Is there much
> difference between the various
> >> types?  Looking through my bookmarks I see a
> few..
> >>
> >> Bergfotron uses transistors
> >> http://hem.bredband.net/bersyn/VCO/Saw%20to%20tri-sin%20W.gif
> >
> > This was pulled from the Moog Modular I believe.
> Jörgen seems to like
> > it a lot.
> >>
> >>
> >> ASM uses diodes
> >> http://www.elby-designs.com/asm-2/vco/vco1-shaper-asm2-cct.pdf
> >
> > This one is also used by Doepfer. It's light on parts,
> but high on
> > harmonic distortion.
> >
> >
> >>
> >>
> >> rwilson uses a 13700 (nothing direct, but it's on
> the VCO schematic)
> >>
> >
http://www.musicfromouterspace.com/analogsynth/VCO200604REV01/vcoschematicpa
> > ge2.gif
> >>
> >> Thanks!
> >>
> >>
> >>
> >> _______________________________________________
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> >
> >
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