[sdiy] Better waveforms of our nature

[Ian Fritz]

Thanks to Don for posting his waveshape results.  It's really great to 
see someone else interested in non-traditional waveforms!

I've been pounding the table about going beyond the usual standard 
waveforms since the mid '70s.  For example
ELECTRONOTES  #68, p 20; #72, p 21; #73, p 7;  several pages on my website:
http://ijfritz.byethost4.com/sy_over.htm (links to five novel waveshaper 
designs)
http://ijfritz.byethost4.com/MiscProj/misc_lnk.htm  (link to the Double 
Deka); several youtube demos
https://www.youtube.com/user/frijitz001 ; and numerous forum threads.

I have been fortunate enough to have had four of my designs made 
available commercially (the 5 Pulser;  the Wavolver; the Double Deka; 
and the Analog XOR.)

I've recently gotten Bernie Hutchens interested in some of this work, 
which he published a couple of months ago in ELECTRONOTES #228 
http://electronotes.netfirms.com/EN228.pdf

Just a couple of comments to expand on Don's work:  While the Square and 
Sawtooth are quite bright, clearly one can go much further.  For example 
the common variable pulse signal has harmonics which are all of equal 
amplitude in the extremely narrow (delta function) width limit.  While 
this waveform contains all harmonics, its anti-symmetric  double  pulse 
cousin has only odd harmonics.

Waveforms with even-only overtones (I don't us the term "harmonics", 
because of the n=1 term) have been looked at many times in the past. 
The EN228 link above has a detailed analysis of this waveform type.  To 
me, they always separate, ie I hear  a Sin wave plus another tone an 
octave above, so I never spent much time on them.

Ian





On 10/16/2016 3:26 PM, Donald Tillman wrote:
> Hey folks,
>
> For those who follow my articles, here's a new one you might enjoy:
>
>     A Palette of Static Audio Waveforms
>     http://till.com/articles/wavepalette/
>
> It includes a demo.
>
> I got bored with the traditional set of audio VCO waveforms.  And instead of just throwing more waveforms at the situation, I looked into the larger issue of what we want from a waveform and the ways use them.  And things got interesting.
>
> I've built a few VCOs with this waveform set over the last couple years, and I've been doing demos at local synth meetups.
>
> In practice, working with a set of timbres like this is a refreshing change from the usual cliche sounds.
>
>   -- Don
>
> --
> Don Tillman
> Palo Alto, California
> don at till.com
> http://www.till.com
>
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