EEG Source Module Max Channels and Parameters

[sinverso]

We’re working on writing a signal acquisition module for the BIOSEMI ActiveTwo, and I have few questions about BCI2000.

Is there a maximum number of channels BCI2000 can acquire from? (We would like to acquire 136 channels.)

Is there a maximum number of channels the raw signal acquisition visualization can show? (I can’t get it to show more than 16).

For some reason the defaults I set in the module code for SoftwareCh, SamplingRate, and SampleBlockSize do not appear in the Configuration dialog. Are the defaults loaded somewhere else? (Other parameters I set appear fine, e.g. SignalType. I can change the values in the Configuration dialog, and they are sent to the signal acquisition module, but the raw signal visualization doesn’t change.)

I’m using the BCI2000 source tar ball downloaded November 21, 2005.

Thanks in advance for any help.

Sincerely,

-Sam

p.s.
I can’t change my now defunct email address in the BBS profile. When I hit submit, it clears all the fields except Occupation, Username, Email address, and Current password, then it cruelly says “You must fill in the required fields.” This happens even if I fill in all the fields and try again. Strangely if I logout and click back on Profile all my old data is still there.
I’ll check the board for a response, but my new email is:
samuel (dot) inverso (at) gmail (dot) com

[gschalk]

Sam,

We’re working on writing a signal acquisition module for the BIOSEMI ActiveTwo, and I have few questions about BCI2000.

What a coincidence. I just talked with some people last week about this. Please make sure you keep me updated on the progress. If there is anything I can do to help, please let me know.

Is there a maximum number of channels BCI2000 can acquire from? (We would like to acquire 136 channels.)

Thanks to Juergen's great work, all the previous limitations are gone. Thus, you should have no problem.

Is there a maximum number of channels the raw signal acquisition visualization can show? (I can’t get it to show more than 16).

... right-click on the source display

For some reason the defaults I set in the module code for SoftwareCh, SamplingRate, and SampleBlockSize do not appear in the Configuration dialog. Are the defaults loaded somewhere else? (Other parameters I set appear fine, e.g. SignalType. I can change the values in the Configuration dialog, and they are sent to the signal acquisition module, but the raw signal visualization doesn’t change.)

It is possible that these parameters are also requested by other parts of the code and transmitted to the Operator after the ones that you request. In any case, if you choose particular parameters, they should have the desired effect on the Source module. Please note that when you change particular parameters (I believe SamplingRate) after you hit SetConfig and Start once, the displays might not be updated properly.

Regarding the BBS, we are transitioning over to the new version of phpBB, which should fix your issues.

Gerv