Clear Filters
Clear Filters

How to filter the noise out from the ECG signal

10 views (last 30 days)
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 Comments
Jonas
Jonas on 11 May 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 on 11 May 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.

Sign in to comment.

Answers (3)

M.B
M.B on 12 May 2022
Edited: M.B on 12 May 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 on 6 Jul 2023
mat lab code

Ganesh
Ganesh on 18 Jul 2023
Code for that

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!