An amplitude-modulated (AM) cosine wave is represented by the formula
x(t) = [10 + cos(2π(2000)t)] cos(2π(104)t)
(a) Sketch the two-sided spectrum of this signal. Be sure to label important features of the plot.
(b) Is this waveform periodic? If so, what is the period?
(c) What relation must the sampling rate fs satisfy so that y(t) = x(t) in Fig. 4-26?
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