[FieldTrip] signal acquisition with Biosemi

Sophie ADAMA adama.sophie at gmail.com
Thu Feb 9 20:37:09 CET 2012


Thanks for your response.

I tried that but I get this: *command not found*. I am using Mac OS Lion.

Any suggestions?



Le 09.02.12 17:56, Robert Oostenveld a écrit :
> 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 
>> <http://fieldtrip.fcdonders.nl/development/realtime/biosemi>.
>> 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' 
>> <buffer://localhost:1972%27>), or
>> ft_read_data('buffer://localhost:1972','begsample',1,'endsample',100 
>> <buffer://localhost:1972%27,%27begsample%27,1,%27endsample%27,100>,........
>> 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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