Search found 7 matches

by caranico
05 Nov 2012, 06:01
Forum: Configuration
Topic: Irregular block duration with actiChamp BrainVsion
Replies: 3
Views: 5797

Re: Irregular block duration with actiChamp BrainVsion

Hi, you're rigth in fact we examined the problem in more detail verifying block durations using SourceTime in BCI2000 and found that the number of samples in each block is constant, in spite of the different duration of the block themselves. Thus, the resulting sampling time varies, and that is ofte...
by caranico
15 Oct 2012, 12:10
Forum: Configuration
Topic: Irregular block duration with actiChamp BrainVsion
Replies: 3
Views: 5797

Irregular block duration with actiChamp BrainVsion

Hi everyone! I've a problem with BCI2000 and actiChamp amplifier. The problem is very similar to this one:http://www.bci2000.org/phpbb/viewtopic.php?f=5&t=1278 I use the RDAClient as Source module and StimulusPresentation as application module. I make some records with windows 7 and analyzing of...
by caranico
02 Oct 2012, 05:37
Forum: BCI Systems - Brain Signals
Topic: reference electrode
Replies: 1
Views: 5814

reference electrode

Hello everybody!
i want to collect opinions on where is the best position for placing the reference electrode.

Recording with a reference electrode (for example ear-lobe or mastoid) and then use CAR is right?
Thank you
by caranico
20 Dec 2011, 11:59
Forum: BCI Systems - Signal Processing
Topic: AR Coefficients
Replies: 1
Views: 3501

AR Coefficients

Hi,
I want to see the ARCoefficients in matlab. I call the mem function (MEX file) from matlab and i build the amplitude spectrum but now i need to see the AR coefficients because i want to use them for a neural network.
Could someone help me?
by caranico
18 Nov 2011, 04:15
Forum: BCI Systems - Signal Processing
Topic: ARFilter Spectral Estimation
Replies: 14
Views: 12523

Re: ARFilter Spectral Estimation

really i'm trying to compare the value of the spectrum amblitude between online and offline analysis. i want a threshold value of the spectrum on the basis of the r^2 that i visualize during offline analysis, but i don't implemet it during online operation. if they call the same function the spectra...
by caranico
17 Nov 2011, 11:17
Forum: BCI Systems - Signal Processing
Topic: ARFilter Spectral Estimation
Replies: 14
Views: 12523

Re: ARFilter Spectral Estimation

thank you Alessandro!! the problem is that i control the value during the online operation and they differ a lot from the values obteined during the offline analysis. I think that the only parameters that could be different is "NumericWindow" because i don't understand where is setted in t...
by caranico
17 Nov 2011, 08:42
Forum: BCI Systems - Signal Processing
Topic: ARFilter Spectral Estimation
Replies: 14
Views: 12523

Re: ARFilter Spectral Estimation

Hi, i have the opposite problem. during online analysis, i want to obtain with the ARFilter the same spectra as that in the offline analysis. It's too important for me because i want to determine a threshold value looking the spectra plot and the r^2 plot obteined in the offline analysis and use it ...