[FieldTrip] ft_preprocessing filter order
abela.eugenio at gmail.com
Tue Oct 16 23:57:12 CEST 2018
any defaults are set in the low-level functions that ft_preprocessing calls. So, for the lowpass filter, go have a look at the help of ft_preproc_lowpassfilter.m, it says:
% FT_PREPROC_LOWPASSFILTER applies a low-pass filter to the data and thereby
% removes all high frequency components in the data
% Use as
% [filt] = ft_preproc_lowpassfilter(dat, Fsample, Flp, N, type, dir, instabilityfix)
% dat data matrix (Nchans X Ntime)
% Fsample sampling frequency in Hz
% Flp filter frequency
% N optional filter order, default is 6 (but) or dependent upon
% frequency band and data length (fir/firls)
The default for the Butterworth low-pass filter is thus 6 (for the bandpass it’s 4). You can set your preferred order when calling ft_preprocessing.m e.g. via cfg.lpfiltord = 4 or whatever makes sense.
Hope that helps
On 16 Oct 2018, at 21:56, Alessandro Orticoni <alessandro.orticoni at gmail.com> wrote:
I would like to ask you just a question: which is the default order of the filters implemented by ft_preprocessing? I cannot find it anywhere.
Thanks a lot,
fieldtrip mailing list
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the fieldtrip