Invisible wrote:


> IIRC, this involves generating a pulse train from an analogue signal. 
> This train consists of negative and positive pulses in such a way that 
> if you average them together, you get the original signal. But actually 
> to make the converter, you send the pulses to a counter, which then 
> converts them into normal binary numbers.

Sounds like PWM.

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.

-- 
~Mike

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