How to filter the noise out from the ECG signal

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YanBo Liu
YanBo Liu am 11 Mai 2022
Beantwortet: Ganesh am 18 Jul. 2023
The original ECG signal looks like this, the sampling frequency is 360Hz.
I try to design a FIR filter to filter the noise out so that i can get a clear view of PQRST complex of the heart beat. I plot this signal in the frequency domain and it looks like this:
So, how should I fiind the frequency where the noise locates?
  4 Kommentare
Jonas
Jonas am 11 Mai 2022
i suggest you play around using the signal analyzer app.
https://de.mathworks.com/help/signal/ug/using-signal-analyzer-app.html
tomorrow i will have a closer look!
Star Strider
Star Strider am 11 Mai 2022
There is obvious 60 Hz line noise. Use a bandstop filter with a very narrow stopband to eliminate it.
Beyond that, it appears to represent normal sinus rhythm with left ventricular hypertophy with non-specific ST-T changes and one notable PVC. If this is a Lead II EKG, the origin of the PVC appears to be near the apex. There are Q-waves, however without a specific voltage calibration, it is difficult to interpret their significance.

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Antworten (3)

M.B
M.B am 12 Mai 2022
Bearbeitet: M.B am 12 Mai 2022
I would also recommend a zero-phase filter using filtfilt function to avoid the introduction of phase lag after filtering the signal.

Ganesh
Ganesh am 6 Jul. 2023
mat lab code

Ganesh
Ganesh am 18 Jul. 2023
Code for that

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