[FieldTrip] power line filter

[Davide Rivolta]

Dear all,

I am trying to get rid of the power line noise. I use the dftfilter as
indicated on the website.

This works very well for most of the subjects. However, for some of them, I
still get the noise.

My trials have a different lenght: between 500 ms until 3 seconds.

This is the script I used.


 filterfreqs = [49:1:51 99:1:101 149:1:151];

    cfg.dftfilter      =  'yes';
    cfg.dftfreq      = filterfreqs;
    cfg.padding    = 10;

    dataprepro_syn = ft_preprocessing(cfg);


The pad of 10 is the same as another already published study that used the
same task.


Attached is a picture of the problem (blu is baseline, red is stimulus).
This is the result of multitepering (dpss).


Thanks for your help,

Davide
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.science.ru.nl/pipermail/fieldtrip/attachments/20111004/1904c787/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: FMA14_power_spectra1.png
Type: image/png
Size: 12809 bytes
Desc: not available
URL: <http://mailman.science.ru.nl/pipermail/fieldtrip/attachments/20111004/1904c787/attachment-0001.png>