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 phase difference for EMG		  New Topic  Reply to Topic
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juggy

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Posted - 12/04/2006 :  2:07:07 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Hi everybody!
Q: How can be calculated the phase difference between two EMG series in Origin 7.5?

Details:
1.for those who are not familiar with the term EMG = electromyography and it is a very complex electrical signal of the muscle recorded from with surface or needle electrodes

2.in the begining I was thinking thet the phase difference is the simple arithmetic difference between the phases of the FFT of the 2 signals; then I discovered that is is defined as "the complex part of the cross-spectra of the 2 EMG signals". How can this be done in Origin? Shoud I perform FFT on each signal and then calculate somehow the cross-spectra or is there a direct step to be applied on the raw signal?

I would appreciate any help with this problem or even only auto- & cross-spectra computing in Origin.

Mike Buess

USA
3037 Posts
Posted - 12/04/2006 :  2:30:31 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
I don't know the best answer to your question but the EMG Toolbar Origin addon might be useful...
http://www.originlab.com/FileExchange/details.aspx?fid=55

You can also check out the author's home page...
http://emgtoolbar.free.fr/index.htm

Mike Buess
Origin WebRing Member
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juggy

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Posted - 12/05/2006 :  10:29:49 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Thanks for the link. It's a very nice tool, but it still does not answer my problem with calculating & plotting the phase difference between two bio-electrical signals.
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Mike Buess

USA
3037 Posts
Posted - 12/05/2006 :  12:47:17 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Perhaps not, but the author is probably the best person to ask about the problem. You can contact him from either of the links.

Mike Buess
Origin WebRing Member
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