octave:spectrum
Plotting the spectrum of the ECG

In the time-domain plot we have identified apparent 50 Hz noise. To be sure that it's 50 Hz we do a Fourier-transform and plot the spectrum.

Now we know for sure that the interference is 50 Hz mains.

The final step is now to remove the 50 Hz mains from our ECG with the help of a filter.

octave/spectrum.txt · Last modified: 2014/05/26 00:45 by berndporr