[Eeglablist] causal filtering pop_eegfiltnew

[Makoto Miyakoshi]

Dear Marta,

> if i want to get a causal filter i should be using the 'legacy' version
of the pop_eegfilt that uses fir1 and firfirl to filter the data?

Right. Check the box 'use causal filter' when you run it.

Makoto


2013/4/24 Marta Castellano <m at martacastellano.eu>

> Dear eeglablist,
>
> I would need some help regarding the filtering of EEG data.
>
> I'm currently using the EEGlab 12.0.2.0b and filtering the data with
> pop_eegfiltnew, which creates a type 1 windowed synch filter and the
> filtering is implemented through firfirlt. As far as I understood, this
> leads to a phase shift because of the firfilt, and also, given that the
> impulse response of the filter is symetric, the filter is acausal (so that
> no causal analysis can be performed).
>
> Does that means that, if i want to get a causal filter i should be using
> the 'legacy' version of the pop_eegfilt that uses fir1 and firfirl to
> filter the data?
>
> Thanks a lot in advance for your help,
>
> Marta
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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