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Balanced Modulation

Balanced Modulation

2002-05-18 by grantrichter2001

Gary Chang was kind enough to point out that the Wiard contains 
3 balanced modulators. This is also called "ring" modulation 
and produces the sum and difference frequencies while 
suppressing the original carrier and modulation frequencies.

The technique is used in the Music Easel balanced modulator, 
simply crossfading between waveforms 180 degrees out of 
phase.

Try this experiment using the Envelator:

1. Env1 Out + is normalled to Mix module Mix 1 input.
2. Patch Env1 O- (Out minus) to mix module Mix 2 input
3. Set Env1 to "Cycle" with A and D set short
4. Listen to the Mix module output
5. As you advance the Mix control, the signal will null when the 
two out of phase versions have equal amplitude and cancel.
6. Now take an audio VCO sine ouput into the MixMod input and 
advance the MixMod control. You will hear the "Klang" (sum and 
difference) tones fade up.

The same technique should work with the Mixolators using the 
X+ and X- outputs of one to feed the X and Y inputs of the 
second. Modulation signal to X1 input of the first with Z at max. 
Feed the carrier signal to ZMOD of the second, and null the 
modulation signal with the second Z control.

This is essentialy what the Ring switch does on the Mixolator, 
but this technique is more adjustable with better linearity.

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