Effects of the DC component

Multiplying out the above equation, we obtain

$\displaystyle x(t) = A_0\cos(2\pi f_c t) + \cos(2\pi f_\Delta t)\cos(2\pi f_c t).$

The carrier frequency is now present in the spectrum.

The second term can be expanded in the same way as was done for RM (i.e. the sidebands are identical).

**Figure 7:** Spectrum of amplitude modulation.
$\begin{figure}\centerline{% \input{amspec.pstex_t}}\end{figure}$

``Music 171: Amplitude Modulation'' by Tamara Smyth, Department of Music, University of California, San Diego (UCSD).