Audio Modulation & Demodulation — EEE 212

BUET — EEE 212 Numerical Technique Laboratory

Modulation & Demodulation of Audio Signal

Project 06

Input

Modulate

Noise

Demod

① Input Audio Signal

Recording time (s)

or

② Type of Modulation

AM

FM

Carrier amplitude (A_c)

Fc

4 200 Hz

Fs

10 000 Hz

fDev

2 000 Hz

BPF

1–4 kHz

③ Adding Noise (AWGN)

50

SNR dB

Noise (SNR dB)

0 dB (max noise)100 dB (clean)

④ Demodulation

⑤ Graphs

Input Signal — Time Domain

Modulated Signal — Time Domain

Noisy Signal — Time Domain

Demodulated Signal — Time Domain

Ready Fs = 10 000 Hz Fc = 4 200 Hz Mode: AM