Comments (4)
Hi!
You need to pass normalized frequencies. See here
from nwaves.
Hi, thank you for reply!
So having Sampling Rate 250Hz should I rather do following?
myFilter = new BandPassFilter(22/250, 32/250, 6);
or rather
myFilter = new BandPassFilter(22/125, 32/125, 6);
If I use 250 instead of 125 my filter is unstable
Edit:
If I reduce sampling rate to 125Hz and use
myFilter = new BandPassFilter(22/125, 32/125, 6);
then its fine but working with sampling rate 250Hz and
myFilter = new BandPassFilter(22/250, 32/250, 6);
makes filter usntable. What could be the root cause?
from nwaves.
I guess the similar issue is described here.
I checked the coefficients for your filter specs - they are the same (or at least very close to sciPy/MATLAB).
According to suggestion in the link I've provided, you can try applying SOS. Something like this:
var f1 = 22000 / 250000f;
var f2 = 32000 / 250000f;
var filter = new Filters.Butterworth.BandPassFilter(f1, f2, 6);
// break filter into second-order-sections:
var sos = DesignFilter.TfToSos(filter.Tf);
var sosFilter = new FilterChain(sos);
// apply SOS
var filteredSignal = sosFilter.ApplyTo(signal);
// or process online:
// foreach (var sample in signal)
// var output = sosFilter.Process(sample);
from nwaves.
Thank you, applying SOS helped :)
from nwaves.
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from nwaves.