[FieldTrip] signal acquisition with Biosemi

Robert Oostenveld r.oostenveld at donders.ru.nl
Thu Feb 9 17:56:06 CET 2012

On behalf of Philip...

On 9 Feb 2012, at 15:31, Philip van den Broek wrote:

> Dear Sophie and Hamza,
> The connection between the Biosemi Active2 system and the FieldTrip buffer is handled by interfacing software biosemi2ft (part of fieldtrip), and should be started from the terminal (mac) or command prompt (windows).
> The interfacing software is located in the FieldTrip folder: ../fieldtrip/realtime/acquisition/biosemi/biosemi2ft
> The BioSemi system needs a configuration (.cfg) file in which some acquisition-related settings are specified. Configuration files for the BioSemi system specify for example from how many channels data should be streamed and/or recorded, and whether the data should be downsampled. For more information about configuration files for different acquisition systems, see the Fieldtrip website.
> To start the buffer that connects to the Biosemi Active2, open the terminal (Mac) or command prompt (PC) and in the folder where you would like to save your data execute (change path according to your system and location of fieldtrip toolbox):
> ../fieldtrip/realtime/acquisition/biosemi/biosemi2ft <config_file> <gdf-file> <hostname> <port>
> <config_file>: configuration file
> <gdf-file>: base name of the gdf file. The suffix .gdf and session counters will be added automatically.
> <hostname>: optional, default is 'localhost', specify '-' to spawn a local buffer (recommended) 
> <port>: optional, default is 1972
> an example:
> ../fieldtrip/realtime/acquisition/biosemi/biosemi2ft myconfig.cfg myfile - 1972
> Note that the manually specified name of the file will overwrite any existing file, so make sure myfile.gdf doesn't exist.
> Once this is running, you get access to the data through the fieldtrip buffer filled with data by biosemi2ft, i.e., fieldtrip fileio functions give you access to the data:
> ft_read_header('buffer://localhost:1972'), or
> ft_read_data('buffer://localhost:1972','begsample',1,'endsample',100,........
> For further information, see fieldtrip website.
> (more info on how we use the system at our department can be found here: http://www.nici.ru.nl/brainstream/twiki/bin/view/BrainStreamDocs/DocsSectionsInstallation)
> Hope this helps you to get things running in your place. If you have any further questions, just let me know. 
> Best regards,
> Philip van den Broek
> Radboud University Nijmegen
> Donders Institute for Brain, Cognition and Behaviour
> Centre for Cognition
> P.O. Box 9104, 6500 HE Nijmegen
> Montessorilaan 3, 6525 HR Nijmegen
> The Netherlands

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