Source of DigitalFilter.h

[nadiDS2]

In order to understand the digital filters used in Emotibit Featherwing and Emotibit MAX30101, I am trying to find the source for the DigitalFilter class used by both.
I found some implementations that have a "DigitalFilter.h" but none of them match the way these two repositories use the filters.

Does anybody know where these filters came from?

[nitin710]

Here is the source for the digital filter: https://github.com/EmotiBit/EmotiBit_XPlat_Utils/blob/master/src/DigitalFilter.h

[nitin710]

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