OpenViBE forum

Dear Laurent & Joan, sorry for the confusion, this shoud be documented somewhere. There is no check by the kernel if the chunks are correctly ordered or even if a stimulation in a stimulation set has a valid date as compared to the chunk start / end time. But - sorry for this - most of the boxes tha...

Dear TPAC and Laurent,

running the two acquisition servers on different computers shoud definitely do the trick !

TPAC, in such situation, you'll have to change the hostname in the Acquisition Client Boxes instead of the ports, so that they point to the right machines.

I hope this helps,
Yann

Dear Jean Jacques, in addition to what Jozef stated, I'd like to mention that OpenViBE does not yet have built in capabilities of measuring confusion, fear, attention and excitement. However, each device comes with its dedicated tools that can measure some of the metrics your are looking for (the wa...

Dear Nicolas, as you are a programmer, may I ask you that you also trace what happens in the setStimulationSet callback in the acqusition server (see line 847 of file ovasCAcquisitionServer.cpp ). Or, if you don't want to investigate in the acquisiton server code, please provide the source code of y...

Thank you Dieter for this very interesting resource.

Yann

Dear cybin,

to my knowledge, this has not been seriously investigated so far. Current BCI design do not really need huge processing resources. What is your use case ?

Yann

Dear cybin,

I'm afraid it is not clear what you want. If you want help from the community, try to clearly state the problem you are facing, what you expected and what did not work as you expected... Then maybe someone will be able to answer.

Yann

Dear realvalue,

I suggest you look at the box tutorials in share/openvibe-scenarios/box-tutorials ; you'll most likely find what you want.

Hope this helps,
Yann

Amélie,

the box scheduling is the order which the kernel uses to activate boxes in a scenario.

Regards,
Yann

Dear Karthik, if you do ICA, you then probably want to apply a spatial filter :) Just have a look at its documentation ; you could also be interested in one of the xDAWN p300 speller or the CSP motor imagery scenarios which actually use similar filters... and of course, don't forget to share your IC...

The Simple DSP does not multiply matrices. karthiks, there is no general purpose matrix multiplication box as this is not really meaningful for the scenario author, this should probably be done at a lower level, by a developer. Still, you can multiply a vector of samples by a matrix using the Spatia...

@the developers: is there any progress or agreement on how the multi-class classifiers will be implemented in the future as there was still no clear decision made in the above topic? How is the work of bpayan progressing, I thought he was working on an extension of the SVM algorithm back then? If I...

Hi Yann, I hope I don't start to annoy you, but I still have some questions as I don't exactly understand some of these synchronization issues. No problem ;) I don't have much time to post on the forum but still, I try to when it is possible. The current version of OpenViBE now includes drift corre...

Dear Rapten, at that time, there is no multi class classifier ready for OpenViBE. I suggest that you use two classifiers, one that would separate rest vs { like or dislike } and then if that's not rest, another one that separates like vs dislike. or you could also contribute a multi class classifier...

Dear Nicolas, Have you traced what happens in the acquisition server driver ? There may be a mistake there. (look for setStimulationSet ). If there is no mistake, the problem may be caused by the drift correction. Try to disable the drift correction and send us a status update. If that's not solved,...