AM Demodulation — Interactive Demo

Demodulation Pipeline

s(t) Input

↓

① Diode

↓

② LPF

↓

③ HPF (DC block)

Input AM Signal

s(t) = A_c[A_mcos(2πf_mt) + b]cos(2πf_ct)

α = A_m / b α = 1.00

f_c / f_m rule-of-thumb fₜ/fₘ = 25.0×

Input Signal Parameters

Amplitude A_m 10.0 V

0.51020 V

Frequency f_m 2.0 kHz

0.5510 kHz

DC Bias b 10.0 V

0.51530 V

Carrier Amp A_c 25.0 V

12550 V

Carrier Freq f_c 50.0 kHz

1050100 kHz

Detector Steps

① Diode (half-wave rectify) ② LPF (envelope follower) ③ HPF (DC block @ ~10 Hz)

Input AM Signal s(t)

① After Diode — x₁(t) OFF

② After LPF (Envelope) — x₂(t) OFF

③ After HPF (DC block) — x₃(t) OFF

Input Spectrum S(f)

Recovered Message M(f) Requires all 3 steps