Frequency modulation by function

Matlab program for Frequency modulation and demodulation by matlab inbuilt function.

clc; clear all;close all;

t=0:0.001:1; % Define time axis

A=1; % Amplitude

fm=10; % Message Signal frequency

fc=100; % Carrier Signal frequency

fs=1000; % Sampling rate of signal

frepdev=50; % Frequency deviation

% Message Signal

Sm=A*sin(2*pi*fm*t);

subplot(4,1,1);

plot(t,Sm);

xlabel('Time');

ylabel('Amplitude');

title('Message Signal');

% Carrier Signal

Sc=A*sin(2*pi*fc*t);

subplot(4,1,2);

plot(t,Sc);

xlabel('Time');

ylabel('Amplitude');

title('Carrier Signal');

% Frequency modulated Signal

Sfm=fmmod(Sm,fc,fs,frepdev);

subplot(4,1,3);

plot(t,Sfm);

xlabel('Time');

ylabel('Amplitude');

title('Frequency modulated Signal');

% Frequency Demodulated Signal

Sfdm=fmdemod(Sfm,fc,fs,frepdev);

subplot(4,1,4);

plot(t,Sfdm);

xlabel('Time');

ylabel('Amplitude');

title('Frequency Demodulated Signal');

Scigyan