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Adding noise to EEG dataset

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Hello I have an EEG dataset loaded into Matlab in Excel format. I want to add a random white noise to the dataset. And I need to convert the output noisy plot again into an excel file. I have attached the Matlab file.
Please suggest me
Thanks
  2 Comments
Kaushik Lakshminarasimhan
Kaushik Lakshminarasimhan on 12 Nov 2017
You already managed to add noise. So you just want to know how to write the output to an Excel file?
dark lion
dark lion on 12 Nov 2017
Nope I am not getting the output of the noisy signal It is showing an error.

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Accepted Answer

Kaushik Lakshminarasimhan
Kaushik Lakshminarasimhan on 12 Nov 2017
I assume you're getting an error in this line:
X = dataset + 2*randn(size(t));
because dataset is an N x 2 array, whereas 2*randn(size(t)) is 1 x N. Also, you don't want to add noise to time. You need to change it to:
X = [time voltage + A*randn(length(t),1)];
A is the variance of noise, you can set A=1 if you wish. Then write to xls using:
xlswrite('noisyEEG.xls',X);
And if you want to plot it:
plot(X(:,1), X(:,2));
  4 Comments
dark lion
dark lion on 12 Nov 2017
thank you very much for your Help the data which i have provided you is a raw EEG data I have to add some noise to the data and give the time voltage values as an input to my circuit
Thank you very much!!!
Kaushik Lakshminarasimhan
Kaushik Lakshminarasimhan on 12 Nov 2017
Sounds cool. Good luck!

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