[FieldTrip] High-pass filter - 0.1

Caspar, Emilie e.caspar at ucl.ac.uk
Sat Aug 9 09:31:05 CEST 2014

Dear Fieldtrip members,

I would like to apply to my data a bandpass filter from 0.016 (or at least 0.1) to 30 Hz

bpfilterRange = [.1 30];

However, it seems that Fieltrip doesn't accept small high-pass filter values. I have the following mistake :

Error in preproc (line 299)
if strcmp(cfg.bpfilter, 'yes'),     dat = ft_preproc_bandpassfilter(dat, fsample, cfg.bpfreq, cfg.bpfiltord,
cfg.bpfilttype, cfg.bpfiltdir, cfg.bpinstabilityfix); end

Error in ft_preprocessing (line 559)
      [cutdat{i}, label, time{i}, cfg] = preproc(dat, hdr.label(rawindx), tim, cfg, begpadding, endpadding);

Error in preprocessing_Libet (line 70)
    allData_prepross      = ft_preprocessing(cfg);

I also tried with 0.2, 0.5, and the minimum acceptable I found was 0.9, which is quite high.

I wonder if the problem comes from my data (but I had no problems on others programs) or if there is a way to apply 0.1 high-pass filter on Fieldtrip?

Thank in advance,


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