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  • I looked at the algorithm some time ago:
    http://forum.espruino.com/conversations/­372681/#16388080

    So as I understand its really not that complicated: bandpass filter and peak recognition as the main steps and a median filter to remove outliers and estimate confidence.

    When I looked into the data, the peak detector seems to be not that reliable. I found many peaks easily detectable by the eye after the bandpass, but missed by the peak detector. So to find a robust peak detector seems to be a valuable task.
    The other obvious thing is to include accelerometer readings to suppress movement artifacts.

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