Comparison of Two Low-Power Signal Processing Algorithms for Optical Heart Rate Monitoring | IEEE Conference Publication | IEEE Xplore

Comparison of Two Low-Power Signal Processing Algorithms for Optical Heart Rate Monitoring


Abstract:

Photoplethysmographic (PPG) heart rate monitoring is widely used in commercial wearable fitness trackers, including those from Fitbit, Apple, Samsung, etc. Wearable senso...Show More

Abstract:

Photoplethysmographic (PPG) heart rate monitoring is widely used in commercial wearable fitness trackers, including those from Fitbit, Apple, Samsung, etc. Wearable sensors must provide accurate data while consuming minimal power to maximize battery life. In PPG monitors, signal processing is used to convert pulsations in a reflected optical signal to a heart rate measurement given as a beat-to-beat interval. This paper compares two low-power, point-by-point signal processing algorithms suitable for PPG monitoring. One is based on derivative filtering, and the other is based on high pass filtering. Both methods have low computational requirements, but the derivative method is shown to be more robust in tracking heart rate during activity and at rest. It provides near beat-to-beat accuracy in a wearable PPG during walking and biking.
Published in: 2018 IEEE SENSORS
Date of Conference: 28-31 October 2018
Date Added to IEEE Xplore: 27 December 2018
ISBN Information:

ISSN Information:

Conference Location: New Delhi, India

I. Introduction

Photoplethysmography-based (PPG) heart rate monitoring [1] is commonly used in wrist-worn and earbud based fitness tracking devices, including those from Fitbit, Apple, Garmin, etc [2], [3]. These devices are typically composed of an optical emitter (LED) and photodetector fixed against the skin in close proximity to one another [4], [5]. The emitted light scatters within the subdermal vasculature, and a small fraction returns to the detector, providing a reflectance signal. When a pulse of blood travels through the vasculature, the reflected signal changes due to the absorbing properties of oxygenated hemoglobin, as well as the expansion of the blood vessel [6].

References

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