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Need explanation of MATLAB code which creates echo. (SIGNAL PROCESSING) If the original audio signal is x(t)...

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Electrical Engineering

Need explanation of MATLAB code which creates echo. (SIGNALPROCESSING)

If the original audio signal is x(t) then the echo is y(t) =x(t) + alpha*x(t-delay)

This code below creates this echo however I don't understand howevery line of the code works, could someone comment this code so Ican understand?

[x,Fs] = audioread('Hallelujah.wav');  sound(x,Fs);  delay = 0.5; % 0.5s delay  alpha = 0.65; % echo strength  D = delay*Fs;  y = zeros(size(x));  y(1:D) = x(1:D);   for i=D+1:length(x)   y(i) = x(i) + alpha*x(i-D);  end

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