• Paul S Addison and James N Watson.
• CardioDigital Ltd., Elvingston Science Centre, Glasdmuir, EH33 1EH East Lothian, Scotland, UK. p.addison@cardiodigital.com
• Med Eng Phys. 2005 Apr 1;27(3):245-8.

AbstractA wavelet-based method is presented for oxygen saturation measurement using photoplethysmogram signals from a standard pulse oximeter device. The transform moduli of both red and infrared signals are used to derive a novel wavelet ratio surface. Projection of the pulse component onto this surface allows optimal derivation of oxygen saturation.

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