Clavia Nord Modular V3 Manuel d'utilisateur télécharger pdf (Page 215)

NORD MODULAR V3.0 8. Synthesis basics: Other synthesis and modulation methods

Page 207

FM FM

FM stands for Frequency Modulation and is a method for adding harmonic and inharmonic frequencies

to a sound by modulating its frequency with another signal. A signal routed to an FM input on a module

affects the pitch by modulating it linearly in the frequency scale as opposed to Pitch modulation where

you modulate the frequency in the note scale. The difference in frequency between carrier and modulator

wave determines the density of partials in the sound. The level of the modulator wave determines the total

bandwidth of the sound.

The practical result of FM is often a “metallic” or “bell” type of sound. The most common wave to do

FM on is a pure sine wave, but any type of waveform can be used, both as modulator and carrier (wave

to be modulated). Complex waveforms will generate more frequencies than simpler waves.

AM AM

AM stands for Amplitude Modulation and is a method for adding frequency bands by modulating the

amplitude of the carrier wave. To illustrate what amplitude modulation actually does to a sound, we have

created a simple example with two sine waves, one carrier and one modulator. The graphs to the left show

the amplitude as a function of time, and to the right the amplitude as a function of the frequency.

time

amplitude amplitude

frequency

Fig 1. AM Carrier wave

time

amplitude amplitude

frequency

Fig 2. AM Modulator wave

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Clavia Nord Modular V3 Manuel d'utilisateur Page 215