US 12,453,485 B2
Processing of electrophysiological signals
Francesco Rundo, Gravina di Catania (IT); Piero Fallica, Catania (IT); Sabrina Conoci, Tremestieri Etneo (IT); Salvatore Petralia, Catania (IT); and Massimo Cataldo Mazzillo, Bari (IT)
Assigned to STMicroelectronics S.r.l., Agrate Brianza (IT)
Filed by STMicroelectronics S.r.I., Agrate Brianza (IT)
Filed on May 17, 2022, as Appl. No. 17/663,804.
Application 17/663,804 is a division of application No. 16/037,328, filed on Jul. 17, 2018, granted, now 11,337,617.
Claims priority of application No. 102017000081018 (IT), filed on Jul. 18, 2017.
Prior Publication US 2022/0273183 A1, Sep. 1, 2022
Int. Cl. A61B 5/00 (2006.01); A61B 5/024 (2006.01); A61B 5/349 (2021.01); G16H 10/60 (2018.01); G16H 50/00 (2018.01); G06V 40/10 (2022.01)
CPC A61B 5/02416 (2013.01) [A61B 5/349 (2021.01); A61B 5/7246 (2013.01); A61B 5/725 (2013.01); G16H 10/60 (2018.01); G16H 50/00 (2018.01); G06F 2218/02 (2023.01); G06F 2218/10 (2023.01); G06V 40/15 (2022.01)] 20 Claims
OG exemplary drawing
 
1. A system comprising:
a photoplethysmography (PPG) sensing apparatus configured to receive a PPG signal; and
a PPG signal processor coupled to the PPG sensing apparatus, the PPG signal processor configured to:
detect peaks and valleys in the PPG signal;
segment the PPG signal to provide a first time series of PPG waveforms located between two subsequent valleys in the PPG signal;
apply pattern recognition to the first time series with respect to a reference PPG waveform pattern produced based on a mathematical model of the PPG signal by assigning a recognition score to the PPG waveforms in the first time series;
produce the reference PPG waveform pattern with a reaction-diffusion model, with diastolic and systolic phases of a heart coupled with the reaction and diffusion properties of the reaction-diffusion model;
apply the pattern recognition by being configured to apply cross-correlation analysis between the PPG waveforms in the first time series and the reference PPG waveform pattern; and
produce a resulting PPG signal by retaining the PPG waveforms in the first time series having a recognition score higher than or equal to a recognition threshold, and discarding the PPG waveforms in the first time series having a recognition score lower than the recognition threshold.