US 12,471,790 B2
Multiple source-detector pair photoplethysmography (PPG) sensor
Peter Richards, San Francisco, CA (US); Javier L. Prieto, Oakland, CA (US); Kevin Pu Weekly, Lafayette, CA (US); Christopher Hanrahan Sarantos, San Francisco, CA (US); Kyle Patrick Nadeau, Los Altos, CA (US); Aniket Sanjay Deshpande, Pleasanton, CA (US); Paul Francis Stetson, Piedmont, CA (US); Vahe Tshitoyan, Pleasanton, CA (US); and Julian Maclaren, Menlo Park, CA (US)
Assigned to FITBIT, LLC, San Francisco, CA (US)
Filed by Fitbit LLC, Mountain View, CA (US)
Filed on Jul. 2, 2021, as Appl. No. 17/366,287.
Application 17/366,287 is a continuation in part of application No. 15/948,970, filed on Apr. 9, 2018, granted, now 11,051,706.
Claims priority of provisional application 62/482,997, filed on Apr. 7, 2017.
Prior Publication US 2021/0330207 A1, Oct. 28, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. A61B 5/1455 (2006.01); A61B 5/00 (2006.01); A61B 5/024 (2006.01)
CPC A61B 5/02416 (2013.01) [A61B 5/6824 (2013.01); A61B 5/7264 (2013.01); A61B 5/7475 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method for generating a physiological metric, the method comprising:
obtaining a first PPG signal based on light received by a light detector from a first light source during a first temporal window during which a second light source is not emitting light;
obtaining a second PPG signal based on light received by the light detector from the second light source different from the first light source and during a second temporal window that is different from the first temporal window and during which the first light source is not emitting light;
removing a motion component from at least one of the first and second PPG signals based on information associated with a first distance between the first light source and the light detector and a second distance between the second light source and the light detector;
processing, via a trained machine learning model of a user device, the first and second PPG signals to produce an output corresponding to a heart rate probability distribution for the first and second PPG signals;
determining the physiological metric using the output corresponding to the heart rate probability distribution for the first and second PPG signals; and
causing the physiological metric to be displayed via a user interface on the user device.