Removing drift from EMG signal
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i want to remove the drift from my emg signal that i obtained. i am using the following script
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/963570/image.png)
the original emg looks like this:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/963575/image.png)
with the scipt above i get the following detrend:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/963580/image.png)
u can see that the drift isnt completely removed, can anyone see what i am doing wrong or what i can change in my script to get the perfect result around y=0
thanks in advance!
1 comentario
Star Strider
el 14 de Abr. de 2022
One option woould be to calculate the fft of the signal to see where the low-frequency variations are, then using a highpass filter to pass everything above those frequencies. That should eliminate the baseline variations.
It will be necessary to experiment to determine the best cutoff frequency.
Respuestas (1)
Chunru
el 14 de Abr. de 2022
%% detrend
% Remove polynomial trend
t = 0:20;
x = 3*sin(t) + t;
y = detrend(x);
plot(t,x,t,y,t,x-y,':k')
legend('Input Data','Detrended Data','Trend','Location','northwest')
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