Logic-based "ringmod" is just XOR. The Arp Odyssey did it that way instead of using a "proper" 4-quadrant multiplier. The results can be pretty interesting and musically useful though!
CMOS XOR is going to interpret everything coming in as either "high" (+5V) or "low" (0V) and is going to output one of those two values. Feeding it different shapes is like changing pulse width. Or for instance, feeding it a dynamic triangle wave, the stronger the amplitude the wider the pulse width.
Two squarewaves into a 4-quadrant multiplier is going to behave just like the XOR, except the output voltage range tracks with the input ranges.
Ringmod doesn't technically have a carrier and modulator, the two inputs are treated equally. A 4QM is just:
input_x voltage * input_y voltage = output voltage
And XOR is:
if either X or Y is high, but not both, the output is high
I'm guessing the "shape" controls on this module might be offsetting the inputs before they get converted to digital logic, which would affect the pulse widths? Something like that maybe.
CMOS XOR is going to interpret everything coming in as either "high" (+5V) or "low" (0V) and is going to output one of those two values. Feeding it different shapes is like changing pulse width. Or for instance, feeding it a dynamic triangle wave, the stronger the amplitude the wider the pulse width.
Two squarewaves into a 4-quadrant multiplier is going to behave just like the XOR, except the output voltage range tracks with the input ranges.
Ringmod doesn't technically have a carrier and modulator, the two inputs are treated equally. A 4QM is just:
input_x voltage * input_y voltage = output voltage
And XOR is:
if either X or Y is high, but not both, the output is high
I'm guessing the "shape" controls on this module might be offsetting the inputs before they get converted to digital logic, which would affect the pulse widths? Something like that maybe.
Statistics: Posted by starthief — Tue Apr 09, 2024 9:24 am