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How to create a noisy signal for wavelet transform practice?

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I was trying the Wavelet toolbox; wherein they have the file 'noisysig.mat'. It contains three variables s1, s2 and x.
I understand that these contain the normal and the noisy signal but I wish to know how to create such noisy signals so that I can practice denoising with some other signals. How do I do that?

Accepted Answer

Rafael Hernandez-Walls
Rafael Hernandez-Walls on 26 Aug 2020
maybe this code will help you
N=1000;
x=linspace(0,2*pi,N);
y=sin(x);
y2=randn(1,N);
y3=y+y2*.1;
subplot(2,1,1);plot(x,y)
subplot(2,1,2);plot(x,y3)

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