OpenViBE forum

Dear Openvibe team In the file p300-speller-3-train-classifier.xml, from my understanding, the classifier training starts when the box 'classifier trainer' receives the OVTK_StimulationId_Train stimulation. Could you please tell me which box sends this stimulation? I checked the box 'Lua Stimulator'...

Thank you very much for your answer. That's really helpful .

-Jim

Dear Openvibe team From the code uint64 l_ui64CurrentTimeInRepetition=l_ui64CurrentTimeInTrial%(m_ui64RepetitionDuration+m_ui64InterRepetitionDuration); from file ovpCBoxAlgorithmP300SpellerStimulator.cpp, when I tried to print out the time using cout>>l_ui64CurrentTimeInRepetition, it shows the tim...

Dear Openvibe I'm using EMOTIV EPOC headset working on p300-xDAWN speller on Windows XP. I would like to ask 2 questions: 1. I tried to export the processed signal from Openvibe using 'File Writer' in .csv format. What's the unit of the output signal? Normally, p300 voltage is in the range of micro-...

Dear Laurent Thank you very much for your reply. According to the quote If you are using openvibe from sources, you can try it right now , do I have to download openvibe-0.12.0-svn3107-src.zip and reinstall everything again? Also, is ' CSV writer' ok with other file types e.g. 'Feature vector' or 'S...

Dear Openvibe I want to create global variables that can be accessed from several boxes. Can we do this by defining ' int global_x ' in ovp_global_defines.h? For example, in P300-speller-xDAWN, if I set ' int global_x = 2' in ovp_global_defines.h, then the box ' P300SpellerStimulator ' and the box '...

Hi Laurent

Thanks a lot for your help. Somehow, I saw the 'update' and didn't drag the new one from the menu and that's why it didn't work at first .

-Jim

Hi I would like to add more settings to the existing box. For example, in the box 'P300 Speller Visualization', there are 15 settings starting from 'interface filename' to 'Selected font size'. I tried to add additional setting using 'rBoxAlgorithmPrototype.addSetting' in the file 'ovpCBoxAlgorithmP...

Hi I use Openvibe-0.12.0-svn3107-src with EPOC headset on Windows XP. I am about to export the output data in CSV format. From the link http://openvibe.inria.fr/documentation/unstable/Doc_BoxAlgorithm_CSVFileWriter.html#Doc_BoxAlgorithm_CSVFileWriter_Miscellaneous , there are 3 types of data I can e...

Hello I'd like to thank you karthiks and jlegeny for their helpful comments. I'm now able to compile the script using win32-build.cmd :) . I have a couple of questions to ask: 1) From a file 'ovpCBoxAlgorithmP300SpellerStimulator.cpp' at line#315, when we append the stimulation using l_oStimulationS...

Hi again Thank you very much for your previous response. It was very helpful. From the quote If you have a specific file that you keep editing and you just need to compile that part of openvibe, edit the win32-init_env_command.cmd file in any text editor you have. Just REM out the parts you don't wa...

I'm sorry but I have another question again :(. From the quote chantrip wrote: 3. I've modified some parts of the file ovpCBoxAlgorithmP300SpellerVisualisation.cpp and would like to test the results. Could you please tell me how to compile and link it with the main file? I use CodeBlocks http://www....

Hi Thank you very much for your information. I'm still studying how the stimulation program works. From my understanding, a file 'ovpCBoxAlgorithmP300SpellerStimulator.cpp' generates a random sequence through a function generate_sequence(void) (line#388) and store them in 2 arrays m_vRow and m_vCCol...

Thank you very much Jozef for your help. It seems the only way for me now is to study the code line by line :s.

I'm checking the file ovpCBoxAlgorithmP300SpellerStimulator.h. Could you please elaborate the state 'State_RepetitionRest' and 'State_TrialRest'?

Thank you very much

-Jim

Hi I tried to modify the stimulation pattern according to the post http://openvibe.inria.fr/forum/viewtopic.php?f=6&t=566 and would like to ask for your help as follows. 1. I'd like to create a new flashing pattern using random variables. Does it have to do with 'op_pSequenceStimulationSet' in the l...