Add, subtract, multiply, divide, logic operations ...

[Eli Brandt]

Bert Schiettecatte wrote:
> > eg... You have two sines, one at say 400hz and another at 800hz. He
> > doesn't wanna hear the two waves "mixed" together (thus you hearing
> > two tones an octave apart), but what he wants is to hear the result of
> > the voltage values of the waves being added together at various points
> > in the time domain.
> 
> finally. somebody understands what I mean :)

I still don't understand.  If you add the instantaneous voltages of
two signals, you're mixing them, right?  or what distinction am I
missing?

One possible issue: if you mix those two sines, you'll hear a single
sound, pitched at 400 Hz, with some second-harmonic content.  You
won't hear them as separate sounds, unless you carefully listen for
separate partials.

> now that this is sorted out ... does ANYONE HAVE THESE SCHEMATICS ? :)

You can add signals with a simple op-amp circuit.  I'd suggest
Horowitz and Hill, but I don't know if that's available in Belgium.

-- 
   Eli Brandt
   eli+ at cs.cmu.edu