(a) Distinguish between sinusoidal and pulse-shaped signals. (b) Explain, showing graphically, how a sinu-soidal carrier wave is superimposed on a modulating signal to obtain the resultant amplitude modulated (AM) wave.

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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.