How can I remove the noise from EEG signal? Sleeping data.

Thank you for your attention. I made this program, but can't run now. Maybe 'bandpass filter' is wrong.

Error message{

Error in MyEEGFil (line 14)

s(:,1) = bpfilter(s(:,1), [0.3 SampleRate]); %bpfilter is another built filter.

Error in MyEEG (line 10)

ans(i,:) = MyEEGFil(record(i,:),fs);

Also I can't use 'designfilt'

function OutputEEG = MyEEGFil(InputEEG,fs)
     % Notch filter
     
    s = InputEEG;
    s =double(s);
   
   
    w0 = 50*(1/fs);
    [b,a] = iirnotch(w0, w0/35); %iirnotch is notch filter (a built in function in Matlab)
    s = filtfilt(b, a, s);
    
    % Bandpass filter
    s(:,1) = Bandpass(s(:,1), [0.3 fs]); %bpfilter is another built filter. 
    s(:,2:3) = Bandpass(s(:,2:3), [0.3 fs]);
    s(:,4) = Bandpass(s(:,4), [10 fs]);
    
    
    
    % Replace NaN and Inf with 0
    s(isnan(s)) = 0;
    s(isinf(s)) = 0;
    
    % Convert to single
    s = single(s);
    
 
 lowEnd = 3; % Hz

highEnd = 70; % Hz

filterOrder = 2; % Filter order (e.g., 2 for a second-order Butterworth filter). Try other values too

[b, a] = butter(filterOrder, [lowEnd highEnd]/([fs fs])); % Generate filter coefficients

d = designfilt('bandstopiir','FilterOrder',8, ...
               'HalfPowerFrequency1',49,'HalfPowerFrequency2',51, ...
               'DesignMethod','butter','SampleRate',fs);

s =double(s);
Foutput(1,:) = filtfilt(d,s(1,:));
Foutput(1,:) = filtfilt(b,a,Foutput(1,:));
OutputEEG = Foutput;
end

[Jan]

Please explain the important detail what "can't run now" means. It is easier to fix a problem than to guess, what the problem is.

[Yusuke Kuroda]

Thank you for attention and sorry for not good English explain.

The problem is i can’t understand how can use bandpass filter.

I changed 'filter' to 'Bandpass', error message is

Bandpass (line 20)

First arg 'n' must be an integer greater than 1

[Jan]

The error message seems to be clear. I do not know, how your file Bandpass() is implemented, but the first argument is expected to be an integer greater than 1. See:

help Bandpass