[sdiy] saw to tri/sine options

[Jerry Gray-Eskue]

I have had some time to think through what the sine function would do in
relation to the original ramp or saw wave and have a postulate:

With a triangle wave centered on 0 volts we get all 4 quadrants of the sine
wave generated over the same period so the Frequency out = Frequency in.

With a ramp or saw centered on 0 volts we get 2 quadrants of the sine wave
generated over the same period so the Frequency out = Frequency in/2.

With a ramp or saw offset to all positive or negative (i.e. 0v - 10v) we get
1 quadrant of the sine wave generated over the same period so the Frequency
out = Frequency in/4.



-----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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