A modulated signal

PHYSICS · Single correct · A Level · Physics · Electronics · Electronics

Problem

A modulated signal Cm(t)=30sin⁡300πt+10(cos⁡200πt−cos⁡400πt)C_m(t) = 30 \sin 300\pi t + 10 (\cos 200\pi t - \cos 400\pi t) . The carrier frequency fcf_c , the modulating frequency (message frequency) fmf_m and the modulation index μ\mu are respectively given by : (1) fc=200f_c = 200 Hz; fm=50f_m = 50 Hz; μ=12\mu = \frac{1}{2} (2) fc=150f_c = 150 Hz; fm=50f_m = 50 Hz; μ=23\mu = \frac{2}{3} (3) fc=150f_c = 150 Hz; fm=30f_m = 30 Hz; μ=13\mu = \frac{1}{3} (4) fc=200f_c = 200 Hz; fm=30f_m = 30 Hz; μ=12\mu = \frac{1}{2}

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