[FieldTrip] Changing samplingrate for EGI-data

[Nathan Weisz]

Hi Daria,

1. you may want to check out the EGI software. there should be some resampling tool. the you can read the downsampled data into FT.
2. you can read chunks of trials using ft_preprocessing. resample. at the end concatenate them with ft_appenddata

ciao,
n

On 19.05.2012, at 20:58, Ingrid Nieuwenhuis wrote:

> Hi Daria,
> 
> Although the name of the ft_preprocessing function may have you suspect differently,with this function you can just 'read in' your data (given your computer has enough memory to contain the whole data) with out any extra preprocessing. Subsequently you can then just resample your data with, indeed, ft_resampledata. For the ins and outs of the ft_preprocessing function, I recommend you take a look at the FieldTrip wiki (fieldrtip.fcdonders.nl) and the preprocessing - reading continuous data tutorial (http://fieldtrip.fcdonders.nl/tutorial/continuous) in particular.
> 
> Hope this helps, 
> Ingrid 
> 
> On May 19, 2012, at 8:21, Daria Laptinskaya <daria.laptinskaya at googlemail.com> wrote:
> 
>> Dear All,
>> 
>> I wish to subsample my EGI-data from 1000 to 250 Hz before
>> preprocessing to speed up the whole analysis.
>> For the step descriped at
>> http://fieldtrip.googlecode.com/svn/trunk/ft_resampledata.m the
>> structure as obtained from the FT_PREPROCESSING function is needed.
>> Does anyone have an idea for read the data with a changing
>> samplingrate before preprocessing?
>> It would really help me a lot!
>> 
>> Thanks,
>> Daria
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