Hello! I'm trying to filter this ECG signal

Hello everyone, I am trying to filter this ECG signal, but I don't know where to start.

I'm still new about signal processing.

Does anyone has any reference for this kind of signal?

Thank you

[Star Strider]

‘... I don't know where to start.’

Neither do I, because there is no sampling frequency or sampling time vector provided. It is therefore not possible to calculate the rate or necessary intervals. That also makes it difficult to design a discrete filter for it.

However it appears to demonstrate ‘electrical alternans’, so a clinical correlation is necessary to rule out a pericardial effusion or other pathology.

[PLW]

Thank you for the reply @starstrider !

I've plotted the signal like this:

x = load('ECG_VOLT.txt');
LeadI   = x(:,1);
LeadII  = x(:,2);
LeadIII = x(:,3);
aVR     = x(:,4);
aVL     = x(:,5);
aVF     = x(:,6);
V1      = x(:,7);
V2      = x(:,8);
v3      = x(:,9);
V4      = x(:,10);
V5      = x(:,11);
V6      = x(:,12);

Fs = 500;

What I don't understand is, what paramater is needed for you to be able to filter a signal.

[Star Strider]

My pleasure.

I guessed that those were the 12 leads. I need the sampling frequency or a vector of sampling times that correspond to your data. As a general rule, the EKG spectrum is 0 to 100 Hz. I saw only some low-amplitude noise in your data, so I have no idea what you want to filter.