Modified file by copied from teacher

README.md

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 # SignalProcessing_filtering
-Experiment basic digital filtering e.g. moving average
+I am doing on filtering the siganl by using the MATLAB

applyMovingAverage.m

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+function applyMovingAverage(freq_sampling, duration_signal, signal_constant, nbSamples, randomRange, plt)
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% function applyMovingAverage(freq_sampling, duration_signal, signal_constant, nbSamples, randomRange, plt)
+% ex.:applyMovingAverage(500, 10, 100, 10, 1);
+%
+% Task: To generate a digital constant signal with noise and apply moving
+% average filter
+%
+% Inputs:
+%	-freq_signal: frequency of the signal (in Hz)
+%   -signal_contant:constant value of our signal(a.u.)
+%	-duration_signal: duration of the signal (in s)
+%   -signal_noise_range: range of noise in our signal(a.u.)
+%   -nbSamples: 
+%	-plt: if greater than 0, signal will be plotted
+%
+% Outputs:None
+%
+% Author: Lymeng LY, lymeng.ly@ecam.fr
+% Date: 07/04/2025
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+%generates time vector
+t=0:1/freq_sampling:duration_signal;
+
+%generate the signal samples
+for l_sample=1:length(t)
+    signal(l_sample) = signal_constant + (rand()*(randomRange(2)-randomRange(1))+randomRange(1));
+end 
+
+%apply the moving average filter
+signal_filtered = movingAverage(t, signal,nbSamples, plt);
+

movingAverage.m

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+function signal_filtered = movingAverage(t, signal, nbSamples, plt)
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% function signal_filtered = movingAverage(t, signal, nbSamples, plt)
+% ex.: signal_filtered = movingAverage(t, signal, 10, 1);
+%
+% Task: To apply a moving average filter
+%
+% Inputs:
+%	-t: temporal vector(in s)
+%   -signal: signal amplitude (length is the same as t), in a.u
+%   -nbSamples=nb of samples taken into account to complete the moving
+%   amplitude
+%   -plot: flag if equal to 1, figures are displayed
+%
+% Outputs: -signal_filtered:filtered signal amplitude is a.u. after
+% windowing
+%
+%
+% Author: Lymeng LY, lymeng.ly@ecam.fr
+% Date: 07/04/2025
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+signal_filtered = zeros(1,length(signal));
+for l_samples = nbSamples:length(signal)
+    sum = 0;
+    for l_avg=0:nbSamples-1
+        sum = sum+signal(l_sample-l_avg);
+    end
+    signal_filtered(l_samples)= sum / nbSamples;
+end 
+
+if(plt)
+    figure;
+    plot(t, signal, 'b'); hold on;
+    plot(t, signal_filtered, 'r');
+    ylim([99 101]);
+    xlabel('Time(s)');
+    ylabel('Amplitude(a.u.)');
+    legend('raw','filtered');
+end