High-pass filtering in MATLAB

Question

Does anyone know how to use filters in MATLAB? I am not an aficionado, so I\'m not concerned with roll-off characteristics etc — I have a 1 dimensional signal vector x sampl

Answer 1

Create your filter - for example using [B,A] = butter(N,Wn,'high') where N is the order of the filter - if you are unsure what this is, just set it to 10. Wn is the cutoff frequency normalized between 0 and 1, with 1 corresponding to half the sample rate of the signal. If your sample rate is fs, and you want a cutoff frequency of 10 Hz, you need to set Wn = (10/(fs/2)).

You can then apply the filter by using Y = filter(B,A,X) where X is your signal. You can also look into the filtfilt function.