Patent ID: 11931147
Assignee: APPLE INC.
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 9:
10. An electronic device comprising:
one or more light emitters configured to illuminate tissue with light at a first wavelength, a second wavelength and a third wavelength;
a light detector configured to detect reflections or scattering of the light at the first wavelength, the second wavelength and the third wavelength; and
a processor configured to:
measure, from the light detector, physiological signals including a first physiological signal at the first wavelength, a second physiological signal at the second wavelength and a third physiological signal at the third wavelength;
determine whether one or more criteria are met for the physiological signals, the one or more criteria including a criterion based on the third physiological signal at the third wavelength; and
in accordance with the determination that the one or more criteria are met for the physiological signals, estimate a physiological characteristic using the first physiological signal at the first wavelength and the second physiological signal at the second wavelength, without using the third physiological signal at the third wavelength.