Adding noise to EEG dataset
显示 更早的评论
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 个评论
Kaushik Lakshminarasimhan
2017-11-12
You already managed to add noise. So you just want to know how to write the output to an Excel file?
dark lion
2017-11-12
采纳的回答
Kaushik Lakshminarasimhan
2017-11-12
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 个评论
dark lion
2017-11-12
Kaushik Lakshminarasimhan
2017-11-12
The actual length of the signal is a lot longer than the number you use (L=150). Why do you even need the sampling frequency for this? Just do:
dataset=xlsread('input signal.xlsx','sheet1','A1:B770');
t = dataset(:,1);
V = dataset(:,2);
X = [t V+1*randn(length(V),1)];
xlswrite('noisyEEG.xls',X);
plot(X(:,1), X(:,2));
dark lion
2017-11-12
Kaushik Lakshminarasimhan
2017-11-12
Sounds cool. Good luck!
更多回答（0 个）
类别
在 帮助中心 和 File Exchange 中查找有关 Descriptive Statistics 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
