Part 11
Amplitude Modulation
Multiplying signals creates new frequencies. Sidebands appear at the sum and difference of carrier and modulator. At low modulator rates you hear tremolo; push the modulator into audio range and the result is metallic, bell-like tones. Switch to ring modulation (bipolar multiply) and the carrier vanishes, leaving only the alien sidebands.
Read the original article on Sound On Sound →Mod
110 Hz
AM
↓
Carrier
440 Hz
→
VCA
Gain
→
Output
Preset
Sidebands: 330 Hz (C - M) 440 Hz (C) 550 Hz (C + M)
Carrier
Modulator