Amplitude modulation (AM) was the invention that made radio broadcasting of voice and music possible. In its infancy, radio waves were used to send nothing more than Morse code signals. In fact, the waves themselves have nothing to do with sound. Radio...

One of the principal means of encoding a radio signal to transmit audio or visual images, differentiation being achieved by variations in the amplitude, the frequency remaining the same. See also: FREQUENCY...

Amplitude modulation (AM) is a technique used in electronic communication, most commonly for transmitting information via a radio carrier wave. AM works by varying the strength of the transmitted signal in relation to the information being sent. For...