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FIGURE 3.4
Profile of the signal of Pb. 3.31.

FIGURE 3.5
Profile of the first input to Pb. 3.32.
Pb. 3.33 In DSB-AM (double-sideband amplitude modulation), the ampli-
tude of the modulated signal is proportional to the message signal, which
means that the time domain representation of the modulated signal is given by:

u DSB (t) = A m(t) cos(2πf t)
c
c
where the carrier-wave shape is

c(t) = A cos(2πf t)
c
c
and the message signal is m(t).

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