frequency_modulation.m
· 720 B · Mathematica
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clc;
clear;
close all;
% Parameters
fs = 1000; % Sampling frequency
t = 0:1/fs:1; % Time vector
fm = input("Enter message frequency: "); % Message frequency
fc = input("Enter carrier frequency: "); % Carrier frequency
Ac = input("Enter carrier amplitude: "); % Carrier amplitude
Am = input("Enter message signal amplitude: ");
ka = 0.8; % Modulation index (keep <= 1)
% Message signal
m = sin(2*pi*fm*t);
% AM signal
am_signal = Ac * (1 + ka*m) .* cos(2*pi*fc*t);
% Plot
figure;
subplot(3,1,1);
plot(t, m);
title('Message Signal');
xlabel('Time'); ylabel('Amplitude');
subplot(3,1,2);
plot(t, am_signal);
title('AM Signal');
xlabel('Time'); ylabel('Amplitude');
| 1 | clc; |
| 2 | clear; |
| 3 | close all; |
| 4 | |
| 5 | % Parameters |
| 6 | fs = 1000; % Sampling frequency |
| 7 | t = 0:1/fs:1; % Time vector |
| 8 | fm = input("Enter message frequency: "); % Message frequency |
| 9 | fc = input("Enter carrier frequency: "); % Carrier frequency |
| 10 | Ac = input("Enter carrier amplitude: "); % Carrier amplitude |
| 11 | Am = input("Enter message signal amplitude: "); |
| 12 | ka = 0.8; % Modulation index (keep <= 1) |
| 13 | |
| 14 | % Message signal |
| 15 | m = sin(2*pi*fm*t); |
| 16 | |
| 17 | % AM signal |
| 18 | am_signal = Ac * (1 + ka*m) .* cos(2*pi*fc*t); |
| 19 | |
| 20 | % Plot |
| 21 | figure; |
| 22 | |
| 23 | subplot(3,1,1); |
| 24 | plot(t, m); |
| 25 | title('Message Signal'); |
| 26 | xlabel('Time'); ylabel('Amplitude'); |
| 27 | |
| 28 | subplot(3,1,2); |
| 29 | plot(t, am_signal); |
| 30 | title('AM Signal'); |
| 31 | xlabel('Time'); ylabel('Amplitude'); |
| 32 | |
| 33 |