function main()
%{
function main()
Main function to analyze the unknown signal

Tasks:
    - Load signal
    - Plot raw signal
    - Perform and plot power spectrum

Author: Tikea TE
Date: 16/04/2025
%}

% ==== Load signal ====
load unknownsignal.mat  
Fs = 200;                % given sampling frequency (Hz)

% ==== Plot the raw signal ====
plotRawSignal(X, Fs);

% ==== Analyze frequency spectrum ====
[f, power] = frequencySpectrum(X, Fs, 1);  % set 1 to plot

% ======== Apply a bandpass filter ==============
% [filteredSignal, Z, P] = iirFilter(10, [5 20], X, Fs, 1);

% ======== Apply FirFilter ===============
filteredSignal = firFilter(30, [5 20], X, 200);  % for a 30th-order bandpass FIR filter

plotFilteredSignal(filteredSignal, Fs);

end