How to plot microvolts values in matlab?
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vaggelis papasot
on 9 Feb 2016
Commented: Star Strider
on 11 Feb 2016
Hi. I have eeg data that are in microvolts from emotiv.Fs=128 aquisition time=1min. When i plot the signal with the time vector t=0:1/Fs:60 i can see it.But when i do fft and plot it with the frequency vector freq=(1:length(signal))*fs/length(signal) the plot is so small i have to zoom in to see it.How can i set the axis to microvolts to prevent this?
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Star Strider
on 9 Feb 2016
You may have a significant d-c offset. Subtract the mean of the signal from the signal before you do the fft. This will have no effect on the frequency content of your signal.
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Star Strider
on 11 Feb 2016
As always, my pleasure!
My own experience with biomedical signal processing led me to hypothesise the d-c offset problem. Thank you for your detailed analysis.
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