Ex 4-2: Find the modulation index and modulation depth if a carrier signal given by 8 cos 2n * 105t is modulated by the signal shown below using AM/DSB-LC technique. f(t) Solution: Ac = 8 v f(t)min = -6 v 6v 3*10*v -f(t)min 0.75 m = 10*v 4 10 v .... D = m x 100% -0.75% -6v The modulated signal waveform may be plotted as shown: ФАм (1) A. 14 2 -A. -2 -8 -14

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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.