Quantification of Embedded PPG Signal-to-Noise Ratio Definitions to Utilize Mediation of PPG Signal Quality on Wearable Devices

摘要

Wearable data acquisition devices include a sensor for detecting a physiological signal, and are used to detect and measure various parameters related to the wearer''s health. Through the use of algorithms, the data detected and measured by the sensor is processed to make inferences used to monitor the wearer''s health. The signal-to-noise ratio (SNR) calculation can be used as a component of the sensitivity analysis of the algorithm. For example, the sleep algorithm will select a block of data, and an SNR calculation will be performed, resulting in an average quality of the signal. The value associated with the signal quality may then be subjected to sensitivity analysis, which will then yield a sleep accuracy value representative of the required minimum signal quality.