AM is used in ordinary commercial r

AM is used in ordinary commercial radio bands and the video portion of
commercial television.
Suppose the audio information, such as voice or music (or the modulating
signal in general) to be transmitted is m(t) = Vm cos ωmt , while
the high-frequency carrier is c(t) = Vc cos ωct , where ωc >> ωm. Then
an AM signal f (t) is given by