| T O P I C R E V I E W |
| juggy |
Posted - 12/04/2006 : 2:07:07 PM
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. |
| 3 L A T E S T R E P L I E S (Newest First) |
| Mike Buess |
Posted - 12/05/2006 : 12:47:17 PM
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 |
| juggy |
Posted - 12/05/2006 : 10:29:49 AM
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 |
Posted - 12/04/2006 : 2:30:31 PM
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 |
