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<p>Hello,</p>
<p>When performing a spectral estimation of EEG data by applying a
FIR bandpass filter and then doing a Hilbert transform (<i>ft_specest_hilbert</i>),
the default filter order proposed by <i>ft_preproc_bandpassfilter
</i>is :<br>
<i> N = 3*fix(Fs / Fbp(1));</i> (l.236).<br>
where Fs is the sampling frequency and Fbp(1) the lower boundary
of the frequency band.</p>
<p>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.</p>
<p>For information, i'm working on EEG data acquired in human
subjects in a visuo-motor adpatation task.</p>
<p>Kind regards,<br>
</p>
<pre class="moz-signature" cols="72">--
Lucas Struber
Ingénieur de recherche
+33 (0)6.33.91.93.52
Laboratoire TIMC-IMAG, équipe SPM
UGA Site Santé
38700 La Tronche</pre>
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