xDawn P 300 online not working
Posted: Mon Jul 22, 2013 9:57 am
Hello !
I have an Emotive Epoc headset which I try to use with the last version of OpenVibe on Ubuntu. I got the data stream live to OpenVibe with a telent raw server, then I launch the p300-speller-aquisition, then the p300-speller-train-xDawn, then the p300 speller classifier. Everything works fine so far and I get classifications around 80%.
But when I launch the p300-speller-online, I get an error saying that the xDawn Spatial filter is getting 14 inputs but expecting only 3...
I read somewhere else on the forum that this was due to a sampling frequency not being ajusted well during the xDawn training. It seems that the original design was for a sampling frequency of 512 whereas the Epoc Emotive uses 128. The post said to use a factor of 4 for oversampling, but it did not solve the problem.
This is my acquisition servers configuration:
Raw Telnet
...
14 channels
Sampling Freq : 128
...
Limit speed: checked
Big Endian
Header Size 0
Interframe Size 0
with a 4 ms drift tolerance and 4 as oversampling factor.
Any help would be greatly appreciated since I've been trying for several hours without success.
Cheers, Alex
I have an Emotive Epoc headset which I try to use with the last version of OpenVibe on Ubuntu. I got the data stream live to OpenVibe with a telent raw server, then I launch the p300-speller-aquisition, then the p300-speller-train-xDawn, then the p300 speller classifier. Everything works fine so far and I get classifications around 80%.
But when I launch the p300-speller-online, I get an error saying that the xDawn Spatial filter is getting 14 inputs but expecting only 3...
I read somewhere else on the forum that this was due to a sampling frequency not being ajusted well during the xDawn training. It seems that the original design was for a sampling frequency of 512 whereas the Epoc Emotive uses 128. The post said to use a factor of 4 for oversampling, but it did not solve the problem.
This is my acquisition servers configuration:
Raw Telnet
...
14 channels
Sampling Freq : 128
...
Limit speed: checked
Big Endian
Header Size 0
Interframe Size 0
with a 4 ms drift tolerance and 4 as oversampling factor.
Any help would be greatly appreciated since I've been trying for several hours without success.
Cheers, Alex