How to filter an entire dataset of ecg signals

I'm learning Matlab so I am a bit lost. Basically I need to download a dataset of ecg signal and than I have to apply with filtfilt function a Band Pass Butterworth Filter of Third Order (1-30 Hz) on all the signal in the dataset.

I have download the dataset from physionet.org (the one I have attached) than I don't know what to do. I need simply to import the file into Matlab or there is another way to manage a dataset? Then, How can I apply the filter to all the signals in the dataset?

I don't want you to write for me the code, I'm just asking for guidance on how to procede or what kind of sources I can consult to help me understand what to do.

Answer 1

[Konrad]

Hi

basically, you already described what to do:

• use load to import the data
• use designfilt to get filter parameters --- EDIT: use butter to design a butterworth filter
• use filtfilt to apply the filter
• wrap a for-loop around everything to process all time series
• if you unzipped the files into datapath, use files = dir(fullfile(datapath,'*.mat')) to get a structure array with all filenames and then apply your for-loop on these files:

for fileIdx = 1:numel(files)
    data = load(fullfile(datapath, files(fileIdx).name));
    ...
end

Best, Konrad