Digital signal processing method for photoplethysmogram for non-invasive real-time monitoring of physiological parameters

S. N. Glebov, Yu. V. Lyamina, M. S. Mazing

Institute for Analytical Instrumentation, Russian Academy of Sciences, St. Petersburg

Abstract: A photoplethysmogram signal processing method using window analysis (10 s), a combination of a fourth-order Butterworth filter and a modified peak detection algorithm is proposed. It is shown that the mean absolute error of heart rate determination is 1.42 bpm with a signal processing time in one window of less than 20 ms. The method is optimized for implementation on low-performance microcontrollers of wearable devices.

Keywords: photoplethysmography, digital filtering, physiological status monitoring, real-time signal processing.

Received: 05.05.2025
Revised: 21.06.2025
Accepted: 23.06.2025

DOI: 10.61011/PJTF.2026.03.62173.20505

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