Filtering restrictions

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Filtering restrictions

Post by shirisimon85 » Sun Dec 14, 2014 12:12 pm

Dear Biosemi team,

I'm interested in studying ultra-slow oscillations in EEG data (from 0.01-0.1 Hz).
Is there any restrictions regarding the on-line filtering and\or post acquisition filtering?
Do you have any recommendations regarding which type of filter is best to use?
Is there anything else I should be aware of?

Thank you very much in advance,
Shiri Simon
Tel Aviv Uni.

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Posts: 887
Joined: Fri Mar 26, 2004 7:00 pm
Location: Amsterdam, Netherlands

Re: Filtering restrictions

Post by Coen » Mon Dec 15, 2014 1:24 pm

Online filters do not affect the data to BDF file, bandwidth on file is always DC till 1/5th of the sample rate (no high-pass).

Use 1st order order or Bessel filters (or other linear phase filters) to minimize overshoot and ringing on step responses (movement artefacts and eye blinks).

Best regards, Coen (BioSemi)

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