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MAXREFDES106# Health Sensor Platform 4.0
This switch toggles the adaptive nature of the ‘Software ECG
Filter’ chain. Adaptive noise filtering can filter out remaining
noise in the filter pass bands by learning the noise profile.
Thus, variations in the signal pertaining to noise are removed
and ECG features are displayed much more clearly.
Filtered data shown in the GUI is saved to a separate .csv file
ending in ‘.ecg_filtered.csv’.
This switch toggles the baseline removal feature of the
‘Software ECG Filter’ chain. This is a Analog Devices
advanced post-processing filter that tracks the baseline signal
and eliminates baseline drift and motion artifacts. It can
recover very fast from sudden signal level changes due to
motion or other possible causes.
Sets the cutoff frequency of the LPF in the ‘Software ECG
Filter’ chain. This is typically used to remove high-frequency
interference noise and is a double-pole IIR Filter. Currently,
only 128Hz, 256Hz, 512Hz, and 1024Hz ECG sample rates
are supported up to the Nyquist frequency (example: 150Hz is
not supported when ECG is set to 256Hz but is selectable
when configuring ECG to 512Hz).
Sets the cutoff frequency of the ‘Notch Filter’ in the ‘Software
ECG Filter’ chain. This is typically set to 50Hz and/or 60Hz to
filter noise introduced by the AC powerline interference.
The ECG ADC sample rate is generated by dividing PLL
frequency by the F Divider, N Divider, and ADC OSR.
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