edfwrite distortes my signal!

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Sadegh Rahimi
Sadegh Rahimi 2022-7-26
Hi there,
I would like to open an EDF file, modify the signal and export it again in EDF; however, the edfwrite distortes my signal!
original signal:
exported signal:
clc;
clear all
close all
[EEG_for_HFO, annotations]=edfread('Rec-06.0001-GFP.edf');
header=edfinfo('Rec-06.0001-GFP.edf');
%% Inputs
EEG=EEG_for_HFO.EEG;
EEG=cell2mat(EEG);
SR=1000; % Sampling rate
% % Artifact Removal
% Threshold=1.5; % Threshold level for Artifact Removing in mili volt
% Window=10; % Length of step for Artifact Removing in mili second
% TimeDuration=100; % Time duration for Artifact Removing in mili second - Before and After
% % Highpass Filter
% FilterLevel=5; % Level of highpass filter
% Cutoff=2;
% %% Orders ------> 1 means On
% ArtifactRemoving=1;
% Filter=1;
% %% Plot
% figure;
% Time=1:length(EEG);
% plot(Time,EEG,'b');
% title('Raw signal')
% xlabel('Time(ms)');ylabel('EEG(mV)')
% %% Artifact Removal
% if (ArtifactRemoving==1)
% Start=100;
% End=Start+Window;
% for ii=1:(round(length(EEG)/Window)-Window)-1
% [Max(ii),max_indices(ii)]=max(abs(EEG(Start:End)));
% if Max(ii)>Threshold
% Before=max_indices(ii)-TimeDuration+Start;
% After=max_indices(ii)+TimeDuration-1+Start;
% EEG(Before:After)=0;
% end
%
% Start=Start+Window;
% End=End+Window;
% end
%
% hold on
% Time=1:length(EEG);
% plot(Time,EEG,'r')
% end
%
% %% Highpass Filter
% if (Filter==1)
%
% a=[];b=[];
% [b,a]=butter(FilterLevel,Cutoff/(SR/2),'high'); % Highpass filtering 2 Hz
% EEG=filtfilt(b,a,EEG);
% end
%% creating header
hdr=edfheader("EDF+");
hdr.Patient="Mice";
hdr.Recording="2021";
hdr.NumDataRecords=1;
hdr.NumSignals=1;
hdr.SignalLabels="EEG";
hdr.PhysicalDimensions="mV";
hdr.PhysicalMin=-5;
hdr.PhysicalMax=5;
hdr.DigitalMin=-32256;
hdr.DigitalMax=32256;
%% exporting edf
%EEGCell= mat2cell(EEG(:), SR*ones(1,numel(EEG)/SR), 1);
f=edfwrite("file.edf",hdr,EEG, annotations);
You can find an example of my EDF files here: EDF
Thanks!

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