Multiple Source-Detector Pair Photoplethysmography (PPG) Sensor

A method for generating a heart rate estimation, 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;
• processing the first and second PPG signals using one or more machine learning algorithms to remove a motion component from the first and second PPG signals;
• determining the heart rate estimation in beats-per-minute using the processed first and second PPG signals having the motion component removed therefrom;
• and
• causing the heart rate estimation to be displayed via a user interface on a user device.

A wearable device for tracking a heart rate estimation of a user, comprising:

• a first light source;
• a second light source different from the first light source;
• a light detector;
• a memory;
• and
• one or more processors, wherein the memory stores computer-executable instructions for causing the one or more processors to:
• obtain a first PPG signal based on light received by the light detector from the first light source during a first temporal window in which the second light source is not emitting light,
• obtain a second PPG signal based on light received by the light detector from the second light source during a second temporal window that is different from the first temporal window and during which the first light source is not emitting light,
• process the first and second PPG signals using one or more machine learning algorithms;
• determine the heart rate estimation in beats-per-minute using the processed first and second PPG signals;
• and
• cause the heart rate estimation to be displayed via a user interface on a user device.