addnoise.m

matlab source code very useful to science study

function [n]=AddNoise() 
global x;
%Original Signal 
global y;
%Noisy Signal 
if (isempty(x)) n = [];
 return; 
end 
y = x + 2*randn(size(x));
%add some noise 
subplot(211) 
plot(y(1:50)) 
title('Signal Corrupted with Zero-Mean Random Noise') 
xlabel('time (milliseconds)') 
n=y;