BioSemi.nl

Dear Coen,

thanks for your fast reply.

Yes, I did use the unreferenced signal. I thought, that if I reference the data, I would increase the correlation, as I add (or better said substract) a common component to the data.
Of course in the raw data there is the CMS/DRL as the common component. But ...

Hi to all,

A few weeks ago I decided to test the functionality of my electrodes, by doing the recomended measuring in salty water.

The data looked fine and everything seemed ok. Then I noticed, that there is a higher correleation between the data for higher sample frequencies.

e.g.: mean of ...

Thanks for these answers

Dear Coen

I did some test measurements do learn more about the triggers, and I noticed the following:

First of all it is possible to send external triggers and function key triggers simultaneously without soldering. I always tried the function keys without the trigger cable connected - and then it ...

Dear Coen,

I'm sorry, but after reading lots of forum entrys and the relevant webpages on your website I still do not understand how it is realisable to send external triggers and function key triggers simultaneously.


[quote="Coen"]Make sure that the trigger inputs 9-16 are pulled low at the ...

Hi Coen

is it possible to explain how you computed the filter graph shown on the webpage
http://www.biosemi.com/faq/adjust_filter.htm
(of course not in detail)

What unfilterd Powerspectrum-behavior of the EEG-data did you assume? 1/f-noise?

I'm just asking beause I don't recieve the same filter ...

Hi Coen.

Thanks a lot for the fast reply and your help.
As I just changed the sample rate for my measurements (measured the participant for about 1 minute, then switched off the A/D box, changed the sample rate, restarted and measured again with the new sample rate at exactly the same conditions ...

[quote="Coen"]...Consequently, the CM voltage is reduced by the open-loop gain of the DRL circuit. ... the open-loop gain of the DRL driver decreases with frequency[/quote]

Dear Coen,
can I understand this in the way, that for high sample rates the interferences aren't reduced as much as for low ...