RM and AM waveforms

Because of the DC component, the modulating signal is often unipolar--the entire signal is above zero and the instantaneous amplitude is always positive¹.

**Figure 6:** A unipolar signal.
$\scalebox{0.5}{\includegraphics{eps/unipolar.eps}}$

The effect of a DC offset in the modulating term is seen in the difference between AM and RM signals.

**Figure 7:** AM (top) and RM (bottom) waveforms.
$\scalebox{0.5}{\includegraphics{eps/amrm.eps}}$

``Music 270a: Modulation'' by Tamara Smyth, Department of Music, University of California, San Diego (UCSD).

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