How to add a noise in my Input graph?

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Maham Arooj 2020-8-13

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评论： hosein Javan 2020-8-13

I have a input signal and i want to add noise to it with zero mean, variance of deviation = 1, sampling time is 600 and maxi deviation (%) is 15. Kindly help?

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hosein Javan 2020-8-13

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编辑：hosein Javan 2020-8-13

在 MATLAB Online 中打开

this code gives a zero mean noise with a sampling rate equal to your signal. just calculate it's amplitude by knowing variance.

t = linspace(0,2*pi,100);
x = sin(t);
an = 0.2; % noise amplitude
noise = an*(rand(size(x))-0.5);
plot(t,x,'r','linewidth',1)
hold on
plot(t, x+noise)

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Maham Arooj 2020-8-13

Thank you Sir...

hosein Javan 2020-8-13

you're welcome.

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Adam Danz 2020-8-13

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编辑：Adam Danz 2020-8-13

noise = randn(size(signal))

will return an array of random values from a standard normal distribution with mean=0 and variance=1. The array will be the same size as your signal. However, the max value has a very low probability that it will be greater than ~6. Remember that with standard normal distributions, 99.9% of all values are within +/- 3 from the mean.