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. Author manuscript; available in PMC: 2019 Jul 1.
Published in final edited form as: Conf Proc IEEE Eng Med Biol Soc. 2018 Jul;2018:3821–3824. doi: 10.1109/EMBC.2018.8513356

Figure 4.

Figure 4.

(a) Amplitude increase in signal due to activity of auto-gain function. The microcontroller samples the dataset for the full sampling period, then adjusts the gain of the active filters to module signal amplitude. (b) Real-time, on-board signal processing of heart and respiratory signals after a very stressful event. The refresh rate of the display is such that heart rate (HR) and respiratory rate (RR) could not be captured in a single photograph at the same time. Additionally, there is a few seconds delay between each snapshot resulting in the difference in HR and RR reported by the reference device (viewed on the smartphone), which has a faster refresh rate than the experimental device.