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AFAIK, no. At least not for signals represented as voltage levels over time (as opposed to frequencies). 4QM is just like "normal" arithmetic multiplication, with neg ∗ neg = pos, and neg ∗ pos = neg. 2Q multiplication forces the modulator to always be positive. Now, I don't know if it does this through full-wave rectification (same as absolute value), or half-wave (same as the function "max (x, 0)"). I suspect half-wave, since that's essentially how a linear vca works.
So for the mathematically inclined, the output voltages are:
4QM (modulator, carrier) = modulator ∗ carrier
2QM (modulator, carrier) = max (modulator,0) ∗ carrier
-hdan
-----Original Message-----
From: jwbarlow@... [mailto:jwbarlow@...]
Sent: Thursday, November 09, 2000 9:17 PM
To: motm@egroups.com
Subject: Re: [motm] Different ring mod sounds
Thanks JH for the detailed thoughts on RM (which I will be digesting for a
while)!
Now another stoopid question, is 4Q multiplication the same as cross product
multiplication and 2Q the same as dot product multiplication?
JB
In a message dated 11/9/2000 7:16:11 AM, synth1@... writes:
>The sidebands
>produced are not
>the same as a 4-quadrant multiplier, because of the "sign" of the signals
>(+
>and - values) are
>"computed" differently.
>
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