5P XOR 5P

frijitz · Last edited by frijitz on Mon Aug 20, 2007 3:29 pm; edited 2 times in total

Scott Juskiw recently put up his Doomsday Machine project,
http://www.tellun.com/motm/diy/tln712/TLN-712.html
part of which is based on the old Craig Anderton Pulse Width Modulator published in Polyphony.

The PW Modulator is based on a string of XOR gate combining different pulse trains, and gives some pretty radical sounds.

So I thought it woud be interesting to feed two of my 5Pulser waveshapers into an XOR and see what came out. Well, it sure gives you a bunch of wild sounds.

Here's a short demo with four sections. One shaper is given a slow modulation and the other a faster one. The first three sections represent different shape and modulation settings. The fourth one begins with the signal from a sawtooth multiphase animator (similar to the EN design) into which is blended the XOR output. The result is a sort of animation with an attitude.

I think there is some interesting territory combining wave shaping with wave animation. Has anyone else been exploring this?

Ian

pexor.mp3

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EdisonRex · Posted: Thu Jul 19, 2007 4:31 pm Post subject:

Funny thing, I've been thinking along the same lines. I had even picked up some chips to play with, for when I got home and built one of your circuits.

You're just way ahead of me, Ian. Smile

frijitz · Posted: Thu Jul 19, 2007 4:39 pm Post subject:

EdisonRex · Posted: Thu Jul 19, 2007 7:26 pm Post subject:

Well it was the discussion of the 5pulser that started it, of course. Your output stage for the 5 pulser outputs being basically an OR gate, made me think of a couple of things. If you could combine pulse lengths via an OR gate, you could get some interesting variable pulse widths.

And I was thinking of what happens when you use some different logic. It's been raining here at the beach so I have had time to sit around and sketch logic tables. Wink

frijitz · Posted: Sun Jul 22, 2007 11:13 am Post subject: More 5P experiments

To extend the capability of my box with two 5Pulsers in it, I have added a "switch-hitter" circuit to combine the outputs as a signal going from A-B through A to A+B. This gives an interesting variety of multi-step waveforms.

To further explore the idea of getting sounds with both animation and timbre modulation, I put together some patches using both (1) the 5Pulser with the multistep output and (2) a second sawtooth VCO detuned from the one driving the pulser. The second SAW was run through a phase shifter modulated by an LFO. The pulser timbre was also modulated with LFO's. A third FM'd VCO was added in some of the patches. For the demo, a fair amount of plate reverb was added to keep the sound pretty smooth. Here's a short clip of some of the sounds I got:

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guitarfool

frijitz