[FieldTrip] FIR filter default order

Lucas Struber lucas.struber at univ-grenoble-alpes.fr
Fri May 29 08:35:00 CEST 2020


When performing a spectral estimation of EEG data by applying a FIR 
bandpass filter and then doing a Hilbert transform 
(/ft_specest_hilbert/), the default filter order proposed by 
/ft_preproc_bandpassfilter /is :
/N = 3*fix(Fs / Fbp(1));/ (l.236).
where Fs is the sampling frequency and Fbp(1) the lower boundary of the 
frequency band.

I was simply wondering, where does this value comes from ? Any 
explication, litterature references or even advice on how to choose N 
(different from default value) when performing hilbert spectral 
estimation is welcome.

For information, i'm working on EEG data acquired in human subjects in a 
visuo-motor adpatation task.

Kind regards,

Lucas Struber
Ingénieur de recherche
+33 (0)

Laboratoire TIMC-IMAG, équipe SPM
UGA Site Santé
38700 La Tronche

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