[Eeglablist] Physical filter Circuits

Makoto Miyakoshi mmiyakoshi at ucsd.edu
Mon Dec 15 12:02:19 PST 2014

Dear Martijn,

We do not recommend online notch filter. It will make a hole in the
background spectrum. You can first try CleanLine (see below) and if it does
not work simply apply low-pass filter to cut 50 Hz off.

I respect circuit builders. I wan t to build the one too.


On Fri, Dec 5, 2014 at 11:11 AM, Martijn De Neeling <martijn.dene at gmail.com>
> Hi All,
> I am fairly new to BCI and I am trying to make an EEG signal amplifier. I
> do not know if this is the correct mailing list for my questions, but I
> will ask them anyways. What is the optimal amplifier setup for filtering
> out the 50 Hz frequency while keeping good EEG signals? Note: I am
> interested in measuring the motoric signals ranging from 7.5 to ~20 Hz.
> At the moment I use this setup:
> Pulse->electrodes->Industrial amplifier->Notch filer 50 Hz->Low-pass
> filter 32 Hz->Amplifier with variable gain of 60-440-> another 50 Hz Notch
> filter(optional)->AD-converter->computer.
> I have read that it is also important to have high pass filters for noise
> below 7.5 Hz. Does anyone recommend this? Also, are physical filters good
> for pre-filtering the data or is it better to use digital filters?
> I hope someone can give me some clear answers on these questions.
> Thanks in advance,
> Martin
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Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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