MUSICA ELECTRONICA

Amplitude modulation (AM) uses a control voltage to change (modulate) the loudness of a sound. The modulated sound is called the carrier signal. When a low frequency signal is used to modulate a given sound wave, the result is a slow, undulating effect called a tremolo, in which the volume of the sound becomes alternately louder and quieter, but without changing the pitch. The volume goes up and down around the center amplitude.