MATLAB: High pass filter with cutoff set at 0.003Hz

frequency domainhigh pass filter

I have a data set consisting of a mean bloodpressure and I want to high-pass-filter this signal with a DC cutoff set at 0.003 Hz. I'm not really familiar with signal processing (filter type, freq domain etc) so if anyone could help me out a bit, that would be great.
thanks in advance,

Best Answer

Before you design a filter with such a low stopband, consider your sampling frequency. If you have a ‘high enough’ sampling frequency, consider a Chebyshev Type II filter.