Amplitude Modulation (AM) is a transmission signal format. It works by modulating the amplitude of a chosen carrier wave (the frequency you tune in to). Your re

Amplitude Modulation (AM) is a transmission signal format. It works by modulating the amplitude of a chosen carrier wave (the frequency you tune in to). Your receiver filters out the carrier wave and leaves you with an ordinary sound signal. It is also a genre, in the sense that it is almost exclusively used for news and talk radio. This is because the bandwidth available on AM bands is not really suitable for rich content like music.