[FieldTrip] 60 Hz notch using preprocessing

[Eelke Spaak]

Dear Francesco,

A notch filter is referred to as a band-stop filter in
ft_preprocessing's documentation, and is different from the
(regression-based) DFT filter. To use a notch filter, specify:

cfg.bsfilter = 'yes';
cfg.bsfreq = [58 62]; % or whatever you deem appropriate

Note that you will have to apply ft_preprocessing repeatedly if you
explicitly want to filter out the harmonics of the line noise as well.

Best,
Eelke

2011/10/28 Francesco Di Pompeo <f.dipompeo at unich.it>:
> Dear all,
>
> I need a 60 Hz notch filter before the ICA of continuous 4D data.
> I did it using ft_preprocessing but the 60 Hz line is still there..
>
> Something wrong in my script?
>
>
> cfg = [];
> cfg.dataset = '0';
> cfg.channel    = {'MEG', '-A246', '-A170', '-A110', '-A19'};
>
> cfg.bpfilter      = 'yes';
> cfg.bpfreq        = [1 150];
>
> cfg.dftfilter     = 'yes';
> cfg.dftfreq       = [60 120 180];
>
> data_meg                 = ft_preprocessing(cfg);
>
>
>
>
> -----------------------------------------------------------------
> Francesco Di Pompeo, PhD
> Institute of Advanced Biomedical Technologies and
> Department of Neuroscience and Imaging
> University of Chieti "G. d'Annunzio"
> Via dei Vestini - Campus Universitario
> 66013 Chieti - ITALY
> ph: +39-0871-3556907
> fax:+39-0871-3556930
>
>
>
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