[FieldTrip] Questions on High pass and Dft filtering
"Jörn M. Horschig"
jm.horschig at donders.ru.nl
Thu Jun 28 16:45:54 CEST 2012
> The padding ensures that we only filter out a narrow 1/10 Hz wide
> frequency bin.
sure, I didn't think about that - that's a pretty good reason to use
padding :) However, the estimation of the 50Hz noise will be biased by
the padded samples. I don't like the dftfilter anyway, and I am not
filtering either (the reason for me is that 50Hz noise should be
invariant to the experimental effects. I mostly investigate TFRs).
> but looking at averaged timelocked data for the subject, the data looks
> identical to the result I get using no filter at all, i.e., contaminated by
> strong line noise.
I'm gonna look into this to see whether it is a bug or not. I'll let you
Jörn M. Horschig
Donders Institute for Brain, Cognition and Behaviour
Centre for Cognitive Neuroimaging
Radboud University Nijmegen
Neuronal Oscillations Group
P.O. Box 9101
NL-6500 HB Nijmegen
E-Mail: jm.horschig at donders.ru.nl
Trigon, room 2.30
NL-6525 EN Nijmegen
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