sjacobs at maroon.tc.umn.edu (Steve Jacobson) writes:
>I am building an EEG machine and intend to digitize the amplified analog signals for input into a
>computer. I am considering using a 16 bit A/D for each channel. The question I have is: Is a 16
>bit A/D overkill? Is 12 bits sufficient. What kind of voltage range am I liable to encounter on
>the EEG electrodes? I intend to use isolation devices between the front-end
>processor and the main computer.
>Any advice would be appreciated.
12 bits is plenty for good amplitude resolution. I'd say the voltage
range of raw scalp-recorded EEG would be +/- 1000 uV. (Just a guess,
since I study ERPs and seldom look at unfiltered single trials of EEG.)
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Kevin Spencer
Cognitive Psychophysiology Laboratory and Beckman Institute
University of Illinois at Urbana-Champaign
kspencer at p300.cpl.uiuc.edu / kspencer at psych.uiuc.edu
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