Filtering restrictions

Post Reply
shirisimon85
Posts: 1
Joined: Sun Dec 14, 2014 10:56 am

Filtering restrictions

Post by shirisimon85 »

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.

Coen
Site Admin
Posts: 1124
Joined: Fri Mar 26, 2004 7:00 pm
Location: Amsterdam, Netherlands
Contact:

Re: Filtering restrictions

Post by Coen »

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)

Post Reply