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Does it looks 60Hz power noise??

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SeungminLee

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I've recorded nerve signal but I still wonder recorded signal is right one..

Recording system has 60Hz notch filter, however, in frequency domain, nearly 50~70Hz signal is still remained and it does not make a sense to me.

I've seen 58~62Hz spectrum peak due to 60Hz power noise, but this is first time for me to see wildly spread power noise.

What do you think about this spectrum? Is it due to 60Hz noise??

(I removed 59~61Hz and 119~121Hz signal by software method. )
 

It is difficult to tell what is there. Maybe you should re-do it without the filtering. It is possible that your filtering is causing the rise around 60Hz. It shouldn't if the filter is correct. You could also do a frequency sweep of your filter to make sure it is correct.

Keith.
 

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