Amplitude Modulation
Def:Amplitude modulation (AM) is a method of impressing data onto an alternating-current (AC) carrier waveform.The highest frequency of the modulating data is normally less than 10 percent of the carrier frequency.
$ x(t) \longrightarrow\otimes\longrightarrow y(t)=x(t)c(t) $
$ \uparrow $
c(t)
x(t) : "information bearing signal"
c(t) : "carrier"
There are two important types of carriers which are "complex exponential" and "sinusoidal"
Complex expenetial
$ c(t) = e ^{j(\omega_c t + \theta_c)} $
$ \omega_c = $ Frequency of carrier
$ \theta_c = $ Phase of carrier
