[Eeglablist] Fwd: Question about filter order

Makoto Miyakoshi mmiyakoshi at ucsd.edu
Mon Nov 26 09:53:39 PST 2012


Dear Shirly,

Actually I don't know what difference it would make if I do it
highpass first or lowpass first.

If I remember correctly, when you apply bandpass filter the function
tells you that if you can't run it because of memory issue, high-pass
filter first and then low-pass filter second. Since then I usually
apply highpass first.

Does anybody in the list know about this?

Makoto

2012/11/20 shirly xu <shirlyxulin at gmail.com>:
> Hello, I used Tools->Filter the data->Basic FIR filter to filter my EEG
> data.
>
> I found that, if I exchange the order of the pass band (use Lower edge of
> the frequency pass band first, then use Higher edge of the frequency pass
> band,  or  use Higher edge of the frequency pass band first,  then use
> Lower edge of the frequency pass band), the results are different from each
> other.
>
> Which order is better? Or may I use low pass and high pass simultaneously?
>
>
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-- 
Makoto Miyakoshi
JSPS Postdoctral Fellow for Research Abroad
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego



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