👉 Modulation is a process in which an audio signal is modified or amplified by applying a frequency-modulating (FM) signal. This modification can be either time-shifted, phase-shifted, or both. FM signals are created by placing a carrier wave at a specific frequency and then applying a modulation to the carrier wave to change its amplitude or phase. For example, in the case of FM radio, the carrier wave is modulated with an FM signal, which changes the frequency of the carrier wave