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

[Magnus Danielson]

> 
> >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?
> 
> No. This can't be true, and it *JUST* dawned on me as to why...
> 
> If I had two sines, both at 400hz, and *mixed* them, then I would hear a
> single pitched tone, possibly SLIGHTLY louder.
> 
> But... If I ADD them together I will *THEN* get a single pitched tone, but
> it will have twice the voltage at the peaks and the SLOPE of the viewed
> waveform will be twice as steep. It will be much more triangle than sine.

I think your of the mark here Mark... doubleing the voltage will make them just
a little louder... using two distinct terminologies makes it look like two
distinct phenomens when they are indeed not. However, by adding two waveforms
you must have the same phase in order to get the doubled amplitude... otherwise
you will get anything from the double amplitude to nothing, depending on the
phase...

> If you then go back to what Bert originally was looking at... I think that
> we'd *ALL* want a module like this...
> 
> Think about *really* dividing waveforms... wow.

There's an Intersil chip which will do both multiply and divide of waveforms..
Just running an waveform into the Z input (it has a X*Y/Z function) with
static values of X and Y could be an quite interesting waveformer as such...
And I agree that this is something I'd like to see... it's certainly not linear
in the same way as before :)

One of the proposals for an ASM-1 panel had this kind of feature (with both
multiply and divide inputs).

Cheers,
Magnus