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6.2 Chapter Six
1.5
−x (t)
z
x (t)
c
1
0.5
0
−0.5
−1
−1.5
0 5 10 15 20
Time, t
Figure 6.1 Example waveforms for linear analog modulation for the mes-
sage signal in Figure 5.1.
2w
1
0.8
0.6
G xc (f) 0.4
0.2
0
−0.2
−6 −4 −2 0 2 4 6
Frequency, f
Figure 6.2 The energy spectrum of the linearly modulated signal for the message signal
spectrum in Figure 5.2.
