In a double sideband amplitude modulation with suppressed carrier (DSB-SC AM) system, the carrier is c(t) = Accos 2n fet where Ac> 0 and the message signal is given by m(t) = AmA(t/3) + Bmsinc²(4t) where Am, Bm > 0. Find the frequency domain representation and the bandwidth of the modulated signal. A frequency-modulated (FM) signal has the form where fe 10MHz, fm = u(t)= Au cos [2π fet + Cu sin 2π fmt] = 1KHz, and Au, Cu > 0. (a) Determine the modulation index and the transmitted signal bandwidth. (b) Repeat part (a) if fm is doubled. (1)

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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.