Blink, etc. are indistinguishable on the signal display.

About the GUI application to design signal processing pipelines
pickku
Posts: 23
Joined: Tue Mar 08, 2011 12:43 pm

Re: Blink, etc. are indistinguishable on the signal display.

Post by pickku »

hi, I tried to visualize eye movements in openvibe using Emotiv for me its coming correctly but it is slow.I think their will be problem in the electrodes, whether you visualized signals in testbench

lbonnet
Site Admin
Posts: 417
Joined: Wed Oct 07, 2009 12:11 pm

Re: Blink, etc. are indistinguishable on the signal display.

Post by lbonnet »

Hi piccku,

If the signal display is printing the signal bit by bit it may be related to the samples per sent block setting of the Acquisition Server.
As the sampling rate of the EPOC is 128Hz, if you select 32 samples per block it result in one block of signal sent by the server every 32/128 = 0.25 seconds.
The acquisition client box receives the signal block by block, each block representing 0.25s. Then it sends it to the signal display that print each 0.25s window.
The result may seem a bit laggy...

Set the samples per sent block to 8 for smooth display.

Hope this helps,

Laurent
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Checkout my (old) blog for some OpenViBE tips & tricks : here !

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