HighFrequencyNoise¶
A meta-node that obtains a ratio of high frequencies (e.g
. >50 Hz) to all frequencies. Used to diagnose potentially bad channels. (Lower values are better.). You should use a highpass filter at 0.5 or 1 Hz before this node (i.e., FIRFilter). Version 1.1.0
Ports/Properties¶
data¶
Data to process.
window_length¶
Sliding window length. A longer window will yield a better estimate, but the spectrum will change more slowly and will also react more slowly to changes. Typical settings for EEG phenomena are 0.5 to 5 seconds, but for very slowly (or rapidly) changing brain dynamics, longer (or shorter) windows may be used.
unit¶
Unit in which the window length is given.
frequencies¶
Transition frequencies for the highpass filter. Provide two frequencies to determine the rolloff curve.
exclude_line_noise¶
Do not take line noise into account. If true, the line noise frequencies are filtered out before calculating the high frequency noise metric.
stop_atten¶
Stopband attenuation in dB for the internal highpass and notch filters. Higher values (e.g. 120) give sharper rolloff and more accurate estimates, but increase computation time. Lower values (e.g. 80) are faster, especially on ARM systems.
set_breakpoint¶
Set a breakpoint on this node. If this is enabled, your debugger (if one is attached) will trigger a breakpoint.
metadata¶
User-definable meta-data associated with the node. Usually reserved for technical purposes.