[Eeglablist] EEG AC and DC record problem

[Akshay Maggu]

Hi Makoto,

On a similar note, Is it better to acquire EEG in a DC or AC mode?

Akshay

On Wed, Jul 8, 2015 at 6:15 AM, Makoto Miyakoshi <mmiyakoshi at ucsd.edu>
wrote:

> Dear Booer,
>
> If data are recorded in what you call 'AC mode', you can't recover 'DC
> mode' data. It's like this:
>
> DC mode data = AC mode data + infraslow signal + DC difference
>
> I believe when you record data with 'AC mode' the recorder should use
> high-pass filter that removes infraslow signal and DC.
>
> Makoto
>
> On Mon, Jul 6, 2015 at 4:18 AM, bjj2909102003 <bjj2909102003 at 163.com>
> wrote:
>
>> Hi, everyone.
>> Recently, I recorded my EEG data in AC mode. And I made the model based
>> on AC mode data (range centred around zero). Now I want to analyze
>> on-line EEG data by my previous model. But the online data is acquired in
>> DC mode (value is big and not centred around zero) by access SDK. I
>> don't know how to convert DC mode data into AC mode data so that I can
>> apply the previous model into the data?
>>
>> Thank you.
>> Booer
>>
>> ------------------------------
>> bjj2909102003
>>
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>
>
>
> --
> Makoto Miyakoshi
> Swartz Center for Computational Neuroscience
> Institute for Neural Computation, University of California San Diego
>
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-- 
Akshay Raj Maggu,
PhD Candidate,
Laboratory for Language, Learning and the Brain,
Department of Linguistics and Modern Languages,
Chinese University of Hong Kong,
Hong Kong.
webpage: http://www.cuhk.edu.hk/lin/new/people/students/maggu/
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