OpenViBE forum

Hello J Richey,

thank you for your interest in OpenViBE. Your question is indeed something asked quite often. There is a very good discussion about the advantages/disadvantages and personal experience with hardware here:

viewtopic.php?f=11&t=526

Cheers
Jozef

@Lorena: I have updated the page, the files are now available as a download.

Hello,

do you have the Emotiv EEG Research edition SDK installed, if yes which version? Is the path to it set correctly in the driver settings?

We will need additional information to be able to help you with this problem.

Cheers
Jozef

Hello tonio112003,

currently openvibe can communicate with external applications via VRPN protocol. You can use a VRPN Button Server in the scenario to export the currently selected letter (row and column, in the case of the P300 scenarios).

VRPN can be used over IP network.

Cheers
Jozef

Hi Lorena, From what you tell me, I assume this rejection class label is not reliable to use as a state to turn ON or OFF a VRPN Button. No it is not. So, this is what I have to do with VRPN and I don't know what label should I use to OFF the Button: When the classifier detects left or right, must s...

Hello, some classification algorithms can generate a result when they can not classify the vector to a particular class. For example if the vector is on the hyperplane of the LDA classifier then no class can be attributed, so it is rejected (this does not seem to be implemented in the openvibe LDA c...

@Haneen: you can precise the file to write in the generic file writer. In order for the file to be created the path must point to an existing directory and the filename must be supported by the operating system (for example on Windows you can not use some characters such as :,( or ). The file will b...

Hello, the reference channel box's purpose is to subtract one channel from all of the others. By definition this box can only work if there are at least two channels. Neurosky already has an implicit reference (on the ear) and it is used by the hardware directly, you do not need to use a reference c...

Hello, since the forum language is English I will write the answer in that so other members of the forums can understand: Which version of openvibe are you using? Have you compiled it yourself or installed it through installer. Which windows are you using and where did you install the Emotiv SDK (Pr...

Hello tonio112003, the algorithm in the previous post was created with an older API for lua scripts. In the newer API, the functions initialize(), uninitialize() and process() take the box as a parameter and all of the openvibe functions are members of this object. As an example here is the previous...

Hello Shelldream,

source code files for the acquisition server are in the OPENVIBE/openvibe-applicaitons/acquisition-server/trunc/src/, not in the share folder. Of course you will need to either download the source code archive or the SVN repository to access these files.

Cheers
Jozef

Hello Ciaran,

you can access the raw EEG signals with the Emotiv EEG headset. You will need to have a Research Edition SDK in order to be able to access the signals.

Cheers
Jozef

Hello, the Generic Stream Writer is a simple file writing box. Its purpose is to store signal for future reading e.g.: by training scenarios or for offline processing. Generic Stream Reader reads the data back. In the case of the P300 scenario, both boxes are present. This is done so one can choose ...

Hello karthiks,

it would seem that something went wrong during the dependency installation. Did you try deleting the dependency folder in openvibe root folder and running the win32-install_dependencies.exe installer again?

Cheers
Jozef

A rather long response concerning the dependencies. Currently our main effort is to make openvibe building and installation smoother on both Linux and Windows. This involves, among other things, work on a binary Linux package. At the moment our only way of distribution on Linux is the source code ar...