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. 2015 Dec 4;10(12):e0143506. doi: 10.1371/journal.pone.0143506

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© 2015 Yamakoshi et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Fig 3 — This shows how the PPGs are analysed to calculate the signal-to-noise ratios of the two photoplethysmography systems. Note that the original raw analogue filtered signal (0.3−30 Hz) is further digitally filtered (0.5−15 Hz) to produce the ‘Signal’ component. Also, the same raw signal is further digitally high pass filtered (15−30 Hz) to produce the ‘Noise’ component.