[FieldTrip] downsampling CTF data prior to ft_preprocessing

[Vladimir Litvak]

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
>
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