SergeModular

>
>--- In SergeModular@y..., "cg_synth" <sasami@h...> wrote:
>>
>> EXOR gates can be used as ring modulators for square/rectangular
>> waves. The effect is the same as if you fed two identical level
>> square/rectangular waves to a regular ring mod. Once the levels or
>> shape of the incoming signals change from that described above,
>while
>> you may still get a sound, it is no longer true ring modulation. I
>> guess you could say EXOR ring modulation is a sub-set of true ring
>> modulation.

> Would it be true to say that any input wave with a "steep" onset
>like a ramp wave could be used , but the outputs , while retaining
>the same fundamentaly related ouputs as if a square wave were used ,
>but with a differant overtone modulation ?

Perhaps. It depends on how the EXOR interprets the incoming wave, or more
specifically, at what point it considers the waveform to be logic high or
logic low. A sine or triangle wave may well prove to generate the exact same
output, if the low to high detection pint is at 50% of the wave height.

> I guess the other boolean functions can similarly used to generate
>similar square wave based output modulations ?

Certainly. I am using a three input AND gate to generate some pretty decent
chime sounds. It is more of a 2 quadrant multiplier (unlike the ring
mod/EXOR which functions as a 4 quadrent multiplier). I am still getting
what sounds like sum and difference tones, but not as emphasized as an EXOR.

> the comparator certainly makes a great sorta fuzz box . especially
>when processing 2 variations of the same sound

A comparator can be considered to be an amplifier with MASSIVE gain, the
output of which clips near the voltage of the power rails. Quite a number of
fuzz boxes are done that way.

Ken
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