[sdiy] Double-Pulse sample

[Ian Fritz]

At 01:45 PM 5/17/06, Tim Parkhurst wrote:
>Hi All,
>
>FINALLY got my double-pulse waveshaper up and running and knocked out
>a sample. You can find it at
>http://www.freewebs.com/timservo/servosmusic.htm
>
>My circuit is very different from Ian's, but I think the results are
>the same. I'll post a schematic in the next few days. Modulating the
>pulse width sounds very aggresive and almost sounds like two VCOs
>beating against each other. Much more pronounced than standard PWM.
>Take a listen and see what you think!

This is very interesting work.   Tim's circuit sweeps from single to double 
pulse by varying one of the pulse's width.  Mine sweeps by varying the 
relative amplitudes of the pulses.  They sound *very* different.  Tim's has 
lots of phaseyness due to the rapidly changing harmonic content of the 
pulse being narrowed.  By contrast, mine has a very smooth sounding 
sweep.  Tim's method is definitely worth looking at as a new kind of sound.

   Ian