[sdiy] saw to tri/sine options

[Jerry Gray-Eskue]

Ian is correct the fundamental frequency stays the same, I checked his
waveform and ones I modeled mathematically using a crude software spectrum
analyzer. What is saw in the spectrum display was basically the same
frequency peaks and levels but the falloff off center of the peaks was
steeper for the rounded wave forms... Interesting stuff.

Thanks Ian




-----Original Message-----
From: Ian Fritz [mailto:ijfritz at comcast.net]
Sent: Tuesday, June 02, 2009 10:21 AM
To: Jerry Gray-Eskue; synth-diy at dropmix.xs4all.nl
Subject: RE: [sdiy] saw to tri/sine options


I have posted an mp3 comparing the rounded vs straight Saw on the e-m forum:
http://electro-music.com/forum/viewtopic.php?p=247574#247574
The rounded waveform has relatively less even-harmonic content so its not
quite as buzzy.

And of course there is no frequency division -- the waves have the same
period.

   Ian


At 08:55 AM 6/2/2009, Jerry Gray-Eskue wrote:

>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/vcoschematicp
a
> > > ge2.gif
> > >>
> > >> Thanks!
> > >>
> > >>
> > >>
> > >> _______________________________________________
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> > >> Synth-diy at dropmix.xs4all.nl
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> > >
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