1.51. Determine whether or not each of the following signals is periodic. If a signal is periodic, determine its fundamental period. (а) х(t) — cos | 2t + 4 (b) x(t)= cos? t (c) x(t)= (cos 2 at )u(t) (d) x(t)= ei™! (e) x[n]= e/l(n/4)–x) 36 CHAPTER 1 Signals and Sy (f) x[n]= cos

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Frequency Modulation

Frequency modulation is a method or process of encoding the data of a specific signal (analog or digital) by modulating the carrier wave frequency according to the frequency of the modulated signal. Modulated signals are nothing more than information or data that should be conveyed after being converted into electronic signals.