[FieldTrip] downsampling CTF data prior to ft_preprocessing

[Frédéric Roux]

Hi Vladimir,

yes now I remember - newDs - will give it a try.

Thanks a lot everyone for the fast and helpful comments!

Fred

----- Original Message -----
From: "Vladimir Litvak" <litvak.vladimir at gmail.com>
To: "FieldTrip discussion list" <fieldtrip at science.ru.nl>
Sent: Thursday, January 16, 2014 1:57:25 PM
Subject: Re: [FieldTrip] downsampling CTF data prior to ft_preprocessing



Dear Fred, 


The CTF command line tool is called newDs . There is a configuration file that you should set-up to specify that you want it to downsample. I used it a long time ago but I can try to find out more details if you can't figure it out yourself. The documentation for the function should be in CTF PDF files. 


Best, 


Vladimir 



On Thu, Jan 16, 2014 at 12:30 PM, Frédéric Roux < f.roux at bcbl.eu > wrote: 


Hi Jim, Hi Eelke, 

thanks for the fast response. 

My issue is that I would like to use ft_definetrial 
to get to my trigger events, hence the reason why 
I want to downsample the raw-data before accessing it 
with ft. 

But technically, I guess I should be able to write up 
my own trigger detection code. It's just more convenient 
without having to do that extra step. 

I thought I'd ask before doing that. 

In any case if anyone comes up with an idea how to do the 
downsampling on the raw-data, please let me know. 

Best, 
Fred 



Frédéric Roux 


----- Original Message ----- 
From: "J.D. Herring (Jim)" < j.herring at fcdonders.ru.nl > 
To: "FieldTrip discussion list" < fieldtrip at science.ru.nl > 
Sent: Thursday, January 16, 2014 1:22:07 PM 
Subject: Re: [FieldTrip] downsampling CTF data prior to ft_preprocessing 

Hi Fred, 


If memory is an issue you could try reading-in the data per channel, 
resample, and appending afterwards. 

Best, 

Jim 


-----Original Message----- 
From: fieldtrip-bounces at science.ru.nl 
[mailto: fieldtrip-bounces at science.ru.nl ] On Behalf Of Frédéric Roux 
Sent: donderdag 16 januari 2014 13:00 
To: FieldTrip discussion list 


Subject: [FieldTrip] downsampling CTF data prior to ft_preprocessing 

Dear all, 

does anyone know of a good method to downsample MEG-data acquired with a 
CTF system before reading it into Matlab/fieldtrip. 

I remember that there is a command-line tool provided by CTF which can do 
preprocessing, but I don't remember exactly if it does the job. 

Or does anyone know of a good alternative solution? 

Best, 
Fred 

_______________________________________________ 
fieldtrip mailing list 
fieldtrip at donders.ru.nl 
http://mailman.science.ru.nl/mailman/listinfo/fieldtrip 
_______________________________________________ 
fieldtrip mailing list 
fieldtrip at donders.ru.nl 
http://mailman.science.ru.nl/mailman/listinfo/fieldtrip 

_______________________________________________ 
fieldtrip mailing list 
fieldtrip at donders.ru.nl 
http://mailman.science.ru.nl/mailman/listinfo/fieldtrip 

_______________________________________________
fieldtrip mailing list
fieldtrip at donders.ru.nl
http://mailman.science.ru.nl/mailman/listinfo/fieldtrip