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From: Debora on 9 Aug 2010 08:50
Sorry, let me try to explain further.

First, yes, I have used the filter design toolbox for the butterworth filter.

As for the signal, I may not be using the appropriate terms, so I will try to write about it. My data has frequencies up to 1000 Hz. I am considering, from literature and previous works, that emg frequencies are from 20 to 500 Hz. Those are the frequencies I've used. Under 20 Hz, close to 0 Hz, I have this peak. This always happens with the equipment I've used, so I am sure this is noise and must be removed.

Thanks, again,
Debora
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