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Motion artifact reduction using multi-channel PPG signals

  • US 10,398,383 B2
  • Filed: 11/25/2016
  • Issued: 09/03/2019
  • Est. Priority Date: 05/28/2014
  • Status: Active Grant
First Claim
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1. A data processing device for using improved motion artifact reduction to extract a desired vital signal, which contains a physiological information component pertaining to a subject of interest, from sensor data that includes time-dependent first sensor data, obtained from a sensed region in a first spectral channel that is sensitive to blood volume variations, and comprising the physiological information component and at least one motion artifact component, and that includes time-dependent second sensor data in the form of photoplethysmography data, obtained simultaneously with the first sensor data, wherein the photoplethysmography data is indicative of a position, a velocity or an acceleration of the sensed region as a function of time in one or more spatial dimensions;

  • the data processing device comprising;

    a decomposition unit, which is configured to receive the second sensor data, to decompose the second sensor data into at least two components of decomposed second sensor data and to provide, based on the decomposed second sensor data, at least two different sets of motion reference data in at least two different motion reference data channels, wherein the decomposition unit is configured to filter the second sensor data as a function of time with respect to its phase components, so as to provide the at least two components of decomposed second sensor data as a function of time in the form of at least two respective phase components of the second sensor data that are phase shifted relative to each other, andan artifact removal unit, which is configured to receive the first sensor data and the at least two different motion reference data channels, and to determine and provide at its output the vital signal (V) formed from a combination of the first sensor data and the motion reference data of at least two of the motion reference data channels; and

    wherein the photoplethysmography data is indicative of an amount of electromagnetic radiation reflected from or transmitted through the sensed region in at least one second spectral channel that is less sensitive to blood volume variations in the sensed region than the first spectral channel.

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