How can I add gaussian noise in a specific percentage (e.g. add 5% gaussian noise to a signal)?
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Pedro Alejandro Garza Juarez
on 18 Apr 2017
Commented: Jubeyer Rahman
on 7 Apr 2020
I have a regular signal in a vector, I want to add 5% gaussian noise to it, anyone got ideas? Thanks
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Accepted Answer
Image Analyst
on 18 Apr 2017
Try this:
period = 20;
t = linspace(-20, 20, 500);
signal = 10*sin(2 * pi * t / period);
noiseSigma = 0.05 * signal;
noise = noiseSigma .* randn(1, length(signal));
noisySignal = signal + noise;
plot(t, noisySignal, 'r.', 'MarkerSize', 10);
hold on;
plot(t, signal, 'b-', 'LineWidth', 3);
grid on;
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/174038/image.png)
5 Comments
kasimala venkatanagaraju
on 6 Apr 2019
sir, I want to generate noise contaminated signal with zero mean and standard deviation of 2%. Can you help me how to generate it.
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