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 Post subject: Detrending the data
PostPosted: Fri Jun 19, 2015 3:05 pm 
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Joined: Tue Apr 14, 2015 2:35 pm
Posts: 9
Hi everyone,

I want to detrend my signal online adquired, but I'm really stuck. I've tried substracting a MA from the original data, but it didn't work.ç

Could you help me?

Thank you and regards.


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 Post subject: Re: Detrending the data
PostPosted: Sat Jun 20, 2015 11:51 am 
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Joined: Tue Apr 14, 2015 2:35 pm
Posts: 9
Well, I think I've achieve it.

Now, after many hours triying it, I have to re-join my epochs, I mean, concatenate all the epochs in a single one.

Any idea? Thank you.

I attach the scenario.


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PB_cal.xml [59.57 KiB]
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 Post subject: Re: Detrending the data
PostPosted: Mon Jun 22, 2015 3:23 pm 
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Joined: Sun Mar 14, 2010 12:58 pm
Posts: 108
We used to have detrending functions in OpenViBE (first order and second order detrending - i.e., simply subtracting the value of one sample for that of the previous one).
But those detrending, as are moving average, as in fact a temporal filters. So the cleanest way of doing that would be by specifying coefficients of a temporal filter, or simply by using a high-pass filter to remove the trend (i.e., the low frequencies).

I hope this helps,

Best regards,
Fabien


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