[Eeglablist] Enquiry regarding bandpass using eegfiltnew

[John Johnson]

I understand the confusion.
You're setting the lower edge and higher edge, of a bandpass filter.

So the lower edge would be 1Hz in your case, and the higher edge would 
be 30Hz.

If you wanted to do highpass filtering only, you would set only the 
lower edge.
Similarly, if you wanted to do lowpass filtering only, you would set 
only the higher edge.

Regards,
John


On 6 Apr 2020, at 13:56, #HENG JIAMIN GLADYS# wrote:

> Dear John,
>
> Thanks for the reply. From the GUI, we need to input values for lower 
> edge of the frequency pass band and higher edge of the frequency pass 
> band.
>
> From my understanding based on eegfiltnew help text, lower edge of 
> frequency pass band corresponds to lowpass (which would be 30 Hz in my 
> case), and higher edge of the frequency pass band corresponds to 
> highpass (which would be 1 Hz in my case).
>
> However, I also came across the youtube video of eeglab filtering 
> (https://www.youtube.com/watch?v=nshi47blz7Q), at about 3:02 min, it 
> was shown that the high-pass value of 0.5 Hz is input to "lower edge 
> of the frequency pass band". My confusion is with this - shouldn't it 
> be input under "higher edge of frequency pass band", or perhaps I have 
> some misunderstanding of this function?
>
> Dear Benedikt,
>
> Thanks also for the recommendation of separating low and high-pass 
> filter. By "the filter-order can then be different per filter", could 
> I ask if there are recommended filter-order for each of the filters?
>
> Regards,
> Gladys
> ________________________________
> From: John Johnson <john.johnson at gatech.edu>
> Sent: Monday, April 6, 2020 8:39 PM
> To: #HENG JIAMIN GLADYS# <JHENG007 at e.ntu.edu.sg>
> Cc: EEGLAB List <eeglablist at sccn.ucsd.edu>
> Subject: Re: [Eeglablist] Enquiry regarding bandpass using eegfiltnew
>
>
> Probably the easiest way is to use the EEGLAB GUI to filter a dataset, 
> then use the eegh command to see how the call to pop_eegfiltnew was 
> made.
>
> Regards,
> John
>
> On 4 Apr 2020, at 9:05, #HENG JIAMIN GLADYS# wrote:
>
> Dear EEGlab list,
>
> I would like to apply a 1 – 30 Hz bandpass filter on my data.
>
> I am using the pop_eegfiltnew function, and would like to double-check 
> if this code has the right input:
> EEG = pop_eegfiltnew(EEG, 30, 1, 660, 0, [], 1);
>
> As the inputs are (EEG, locutoff, hicutoff, filtorder, revfilt, 
> usefft, plotfreqz, minphase), therefore locutoff is “30” and 
> hicutoff is “1”.
>
> Thanks a lot in advance!
>
> Stay safe and healthy,
> Gladys
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