The concepts of Amplitude Modulation, Modulation and Demodulation, along with their differences is explained below. To involve data information or speech information, another wave has to be imposed known as input signal above the carrier wave. This process of imposing an input signal on a carrier wave is known as modulation. Put differently.
Modulation is a process of varying one or more periodic waveform properties with a modulating signal that typically contains the data to be transmitted. Most of the radio systems in the 20 th century either used amplitude modulation or frequency modulation for radio broadcasting.