Consider a new message signal
We select carrier frequency to be fc = 500 Hz. Following
the example in Section 4.12.1, numerically generate the following figures:
(a) The signal waveform of m1(t) and its frequency domain
(b) DSB-SC amplitude modulation signal s(t) = m1(t) cos
2_fct and its frequency response.
(c) The signal e(t) = 2s(t) cos 2_fct and
its frequency response.
(d) The recovered message signal in time and frequency
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