Bi-pulse convertor (ON-topic)

[KA4HJH]

Here's a little project for everybody (and I keep thinking I already saw
this in ElectroNotes or somewhere but...). This evening I got to fool
around with the software synth Reaktor and I really like the harmonic sweep
you get with the "bi-pulse" oscillator. This is basically a pulse wave
where the positive and negative halves are generated separately and work in
opposition. The top varies from 50% to 1% while the bottom varies from 50%
to 99%, and vice versa.

The waveforms (converting from a ramp) look something like this:

0% CV

----------              +5
          |
          |
          |              G
          |
          |
           ----------   -5

50% CV

-----                   +5
     |
     |
      ---------          G
               |
               |
                -----   -5

75% CV

---                     +5
   |
   |
    -------------        G
                 |
                 |
                  ---   -5

Sounds like PWM but distinctly different. Should also work with a triangle
input. Obviously this is a simple quantization problem, which has been
discussed before. Anyone have a schematic?


-- 
Terry Bowman, KA4HJH
"The Mac Doctor"