Mike Raiford wrote:

> Sounds like PWM.

Strictly, that's what D/A and A/D converters do. ;-)

> Fun stuff. A while back I was playing around with some DSP-type stuff. 
> What I found was interesting is that if you generate an ideal square 
> wave, them attempt to sweep it, you'll get audible artifacts, but if you 
> generate the square wave by adding sine waves at odd harmonics, and you 
> use a cycle of that generated wave to produce a sweep, it works nice and 
> smooth, as it should.

Somebody doesn't understand the Nyquist limit, and sinc filtering, 
methinks...

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