Patent ID: 9259188
Filing Date: 2016-02-16
CPC Classification: A61B

Claim Text:
1. A method for determining a physiological parameter, the method comprising: generating, using a pulse oximetry sensor, a first photoplethysmograph (PPG) signal corresponding to a first wavelength of light and a second PPG signal corresponding to a second wavelength of light; receiving, using a pulse oximeter, the first PPG signal and the second PPG signal; performing, using the pulse oximeter, a wavelet transform of the first PPG signal to generate a first set of complex transform numbers; generating, using the pulse oximeter, a first scalogram of real numbers based on a modulus operation performed on the first set of complex numbers; performing, using the pulse oximeter, a wavelet transform of the second PPG signal to generate a second set of complex transform numbers; generating, using the pulse oximeter, a second scalogram of real numbers based on a modulus operation performed on the second set of complex numbers; summing, using the pulse oximeter, the first scalogram and the second scalogram to generate a modified scalogram; and determining, using the pulse oximeter, the physiological parameter based on the modified scalogram.