high drift and time delay, using OpenViBE [resolved]
ExypnosDevloper
Mumbai,India
While using openvibe, I m getting high drift and it's recursively increasing... As a part of the p300 experiment or any other, the signal gets delayed by 2 sec and more. So if there could be packet loss or any issue which I m not aware of could be replaced with a wired connection from the board to dongle. Or any other preferable solution which could solve this problem.
I m using
1. Cyton board v3 32bit with Cyton dongle
2. Gold cup electrodes with ten20 conductive paste
Comments
Hi Exy, do you see this drift and time delay using the OpenBCI GUI? If the GUI is working fine, then this is an issue with your use of OpenViBE. The original old version of the built-in Cyton serial driver in OpenViBE did have some drift issues. I thought this had been corrected in later versions when OpenViBE abandoned the concept of accumulated 'drift'.
The Cyton sample rate, because it is not crystal controlled, is very slightly different than exactly 250.000 Hz. For example it might be 250.01 Hz. Or 249.92 Hz. Etc. Your software and OpenViBE should not assume that 250 means EXACTLY 250.00000.
Another way to feed data from Cyton is to use the GUI and the Networking widget to output LSL LabStreamingLayer format stream to OpenViBE. Then you don't have to use the old Cyton serial driver in OpenViBE.
Regards, William