FM (frequency modulation) varies:
ACarrier FREQUENCY proportional to information signal
BPhase only
CAmplitude
DRandom
Answer & Solution
Correct answer: A. Carrier FREQUENCY proportional to information signal
FM: frequency varies with m(t). s_FM(t) = A cos(ω_c t + 2π k_f ∫m dt). Carson's rule: BW ≈ 2(Δf + f_m). Higher noise immunity than AM (FM radio). Used in commercial FM radio, sound channel of TV (analog era).
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