bandwidth speed mode 4 decimation 1/4: 104, 134 or ?
Posted: Mon Jul 12, 2010 6:31 pm
Dear all,
Please I ask for you help in answering a question about bandwidth on the ActiveTwo Speed Mode 4 with decimation 1/4 that leads to a sampling rate of 512 Hz. Various sources of information seem contradictory.
We would like to report the bandwidth used for recording in a manuscript. We believe that the actiview interface displayed this:
http://mindbrain.ucdavis.edu/people/cam ... 9.png/view
This points to the idea that the bandwidth is DC to 104 Hz, which I think Coen points out in a previous thread is approximate.
However, each EEG channel includes a Prefiltering header value that reads HP: DC; LP: 134 Hz.
The spec (1.7) in the manual reads DC - 400 Hz but I take it that this drops following prefiltering and decimation.
The spectrum of the raw EEG data (prior to any other filtering but necessarily after the prefiltering) is a follows.
http://mindbrain.ucdavis.edu/people/cam ... m.png/view
There seems to be hegemony of what people report in the literature when recording 512 Hz with biosemi, e.g. 100, 134. So please what do you think is the bandwidth? I look forward to your responses.
Kind regards,
Tom Campbell.
Please I ask for you help in answering a question about bandwidth on the ActiveTwo Speed Mode 4 with decimation 1/4 that leads to a sampling rate of 512 Hz. Various sources of information seem contradictory.
We would like to report the bandwidth used for recording in a manuscript. We believe that the actiview interface displayed this:
http://mindbrain.ucdavis.edu/people/cam ... 9.png/view
This points to the idea that the bandwidth is DC to 104 Hz, which I think Coen points out in a previous thread is approximate.
However, each EEG channel includes a Prefiltering header value that reads HP: DC; LP: 134 Hz.
The spec (1.7) in the manual reads DC - 400 Hz but I take it that this drops following prefiltering and decimation.
The spectrum of the raw EEG data (prior to any other filtering but necessarily after the prefiltering) is a follows.
http://mindbrain.ucdavis.edu/people/cam ... m.png/view
There seems to be hegemony of what people report in the literature when recording 512 Hz with biosemi, e.g. 100, 134. So please what do you think is the bandwidth? I look forward to your responses.
Kind regards,
Tom Campbell.