Search found 645 matches

by yrenard
Mon Jan 30, 2012 1:58 pm
Forum: Tutorial scenarios
Topic: design a scenario
Replies: 3
Views: 6564

Re: design a scenario

Dear mana, the Lua stimulator box can be used to generate appropriate stimulation codes. Lua is a very simple programming language. The box will let you program a stimulation sequence that will be sent to later boxes. The documentation includes HOWTO samples to show you haw to use such box. Once you...
by yrenard
Mon Jan 30, 2012 1:52 pm
Forum: Boxes
Topic: Box behaving differently in different situations
Replies: 17
Views: 16039

Re: Box behaving differently in different situations

Dear karthiks,

do you mean when the sampling frequency / sample count per block ratio changes ?

If this is what you mean, you would probably be interested in re-epoching the signal stream with a Time Based Epoching box.

Hope this helps,
Yann
by yrenard
Sun Jan 29, 2012 7:56 pm
Forum: Acquisition server and drivers
Topic: Brain Products actiChamp supported ?
Replies: 4
Views: 6419

Re: Brain Products actiChamp supported ?

Dear sebihoefle,

as far as I know, the RDA protocol has been specified by BrainProducts themselves. It would be weird that the Pycorder software behaves differently than the BrainVision Recorder (btw, weird does not mean imposible ;) ).

Keep us posted,
Regards,
Yann
by yrenard
Sun Jan 29, 2012 7:43 pm
Forum: Boxes
Topic: Box behaving differently in different situations
Replies: 17
Views: 16039

Re: Box behaving differently in different situations

Dear karthiks, as Laurent stated, the EBML Stream Spy box will probably help in sorting this out. This box is designed to dump the stream structure in the console log. Using this, we can easily observe bad chunk dating, abnormal number of chunks per scheduler steps etc. Please put such box in your s...
by yrenard
Sun Jan 29, 2012 7:36 pm
Forum: Tutorial scenarios
Topic: design a scenario
Replies: 3
Views: 6564

Re: design a scenario

Dear Mana,

you'd better generate a stimulation sequence with a Lua Stimulator box and connect two Sound Player boxes to this stim generator.

Hope this helps,
Regards,
Yann
by yrenard
Sun Jan 29, 2012 7:34 pm
Forum: Discussion about BCI and related topics
Topic: Emotiv Hardware
Replies: 10
Views: 28530

Re: Emotiv Hardware

Dear Stefan thank you for your very insightful post. I suspect the problems most people complain about with the emotiv device (qualified as noise ) is actually electrode contact loss. This happens quite usually with my device at locations such as T7/T8 for instance, when swallowing or even moving he...
by yrenard
Thu Jan 26, 2012 12:51 pm
Forum: Help for building the software
Topic: [Arch Linux| Installation
Replies: 2
Views: 5401

Re: [Arch Linux| Installation

Chears,

I just wrote a new blog post about how to compile OpenViBE on a new Linux distro.

I hope this helps future contributors !
Regards,
Yann
by yrenard
Sun Jan 22, 2012 6:24 pm
Forum: Discussion about OpenViBE
Topic: OpenVibe Visual Studio 2010 solution
Replies: 7
Views: 6850

Re: OpenVibe Visual Studio 2010 solution

Could you try with latest SVN revision ? I saw a recent commit from Laurent Bonnet that should fix this problem !

Regards,
Yann
by yrenard
Sat Jan 21, 2012 2:49 pm
Forum: Discussion about OpenViBE
Topic: OpenVibe Visual Studio 2010 solution
Replies: 7
Views: 6850

Re: OpenVibe Visual Studio 2010 solution

Dear anton,

why don't you use the provided win32-generate-vc-proj.cmd script ?

Regards,
Yann
by yrenard
Thu Jan 19, 2012 8:23 pm
Forum: Discussion about OpenViBE
Topic: 2d and 3d visualisation
Replies: 4
Views: 4143

Re: 2d and 3d visualisation

Hello everyone, your are actually referring to bug #34 Forget the 0, the color scale is representing low values with blue color and high values with red color, no matter if 0 is between these two min / max values ; also, the data scale is refreshed for each input value to fit the color scale. You sh...
by yrenard
Thu Dec 22, 2011 9:41 am
Forum: Designer
Topic: Urgent help, please
Replies: 6
Views: 8159

Re: Urgent help, please

I also have some questions about the available EEG samples on openvibe (for the P300 speller and the magic card). Can you please provide me with detailed information about them, e.g. which EEG recording system was used to collect the data? How many training sessions were done before the data collec...
by yrenard
Tue Dec 20, 2011 2:25 pm
Forum: Scenarios and BCI design
Topic: P300 speller and LDA accuracy
Replies: 20
Views: 22495

Re: P300 speller and LDA accuracy

Hello guys, sorry I'm taking the discussion very late as I got the notification of this evolution in the SVN commit mailing list. I'd like to point out two issues and propose one alternative solution here : Computing TP/FP supposes 2-class classifiers. Even if OpenViBE does not come with multi class...
by yrenard
Tue Oct 25, 2011 8:31 am
Forum: Scenarios and BCI design
Topic: day 1: which headset to start experimenting?
Replies: 5
Views: 5523

Re: day 1: which headset to start experimenting?

Dear Dieter, dear Alessiof, OpenEEG is actually up to 6 channels. It is cheap as well but this is a do it yourself device ; you'll need basic skills in electronic montage to set this up, or you can buy pre-built cards from Olimex. Still, there will be no case for the cards and you'll have to build t...
by yrenard
Mon Oct 10, 2011 7:43 pm
Forum: Driver development
Topic: QDS Driver
Replies: 3
Views: 4175

Re: QDS Driver

Dear bernat, dear Laurent, OpenViBE actually does not handle a physical unit with acquired data so far. Each driver is free to use whatever matches its needs. The Brain Products Brainamp driver for instance, has a scaling parameter included in its configuration dialog. By the way, you can use the fu...
by yrenard
Tue Sep 27, 2011 1:58 pm
Forum: Box and application development
Topic: stimulation based epoching
Replies: 8
Views: 10130

Re: stimulation based epoching

Dear Nicolas, I suspect that you have an "early" stimulation and that l_ui64OffsetSampleCount would be less than zero (being unsigned, that results in so called crazy value :) ). That may be a bug but can you confirm that this is happening in your case (see line 222 of ovpCBoxAlgorithmStimultionBase...