alleryStart learning →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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