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Reducing Motion Induced Artifacts in Photoplethysmography (PPG) Signals

a technology of photoplethysmography and artifact reduction, applied in the field of heart rate measurement, can solve the problems that the heart rate estimation of ppg during motion can be adversely affected, and achieve the effect of reducing motion induced artifacts

Inactive Publication Date: 2017-06-15
TEXAS INSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent describes a method and device for measuring heart rate using photoplethysomography (PPG) signals. The device includes an accelerometer and a motion compensation component that reduces motion induced artifacts in the PPG signals. The motion compensated PPG signals are combined to generate a final motion compensated PPG signal, which is then analyzed to estimate heart rate using a single Fourier Transform. The technical effect of this invention is to improve the accuracy and reliability of heart rate measurement in PPG devices.

Problems solved by technology

PPG based heart rate estimation during motion can be adversely affected by motion artifacts in the PPG signal.

Method used

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  • Reducing Motion Induced Artifacts in Photoplethysmography (PPG) Signals
  • Reducing Motion Induced Artifacts in Photoplethysmography (PPG) Signals
  • Reducing Motion Induced Artifacts in Photoplethysmography (PPG) Signals

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Embodiment Construction

[0012]Specific embodiments of the invention will now be described in detail with reference to the accompanying figures. Like elements in the various figures are denoted by like reference numerals for consistency.

[0013]As previously mentioned, motion artifacts in a PPG signal can adversely affect heart rate estimation. Some current approaches to improving heart rate estimation when motion artifacts may be present in the PPG signal attempt to remove the motion component in the PPG signal using information from an external signal reference such as an accelerometer. For example, in H. Fukushima, et al., “Estimating Heart Rate using Wrist-Type Photoplethysmography and Acceleration Sensor While Running,” 34th Annual Internal Conference of the IEEE Engineering in Medicine and Biology Society, pp. 2901-2904, Aug. 28-Sep. 1, 2012, a spectrum subtraction technique is proposed that removes the spectrum of the acceleration data from that of the PPG signal prior to heart rate estimation.

[0014]In...

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Abstract

A method for heart rate measurement in a photoplethysmograph (PPG) heart rate monitor device is provided that includes performing motion compensation on a PPG signal wherein a motion compensated PPG signal PPGaccX is generated with reference to an X-axis acceleration signal, a motion compensated PPG signal PPGaccY is generated with reference to a Y-axis acceleration signal, and a motion compensated PPG signal PPGaccZ is generated with reference to a Z-axis acceleration signal, combining PPGaccX, PPGaccY, and PPGaccZ to generate a final motion compensated PPG signal, wherein a first weight is applied PPGaccX, a second weight is applied to PPGaccY, and a third weight is applied to PPGaccZ, performing a single Fourier Transform (FT) on the final motion compensated PPG signal to generate a frequency domain PPG signal; and estimating a heart rate based on the frequency domain PPG signal.

Description

BACKGROUND OF THE DISCLOSURE[0001]Field of the Invention[0002]Embodiments of the present invention generally relate to heart rate measurement and more specifically relate to reducing motion induced artifacts in photoplethysomography (PPG) signals used for heart rate measurement.[0003]Description of the Related Art[0004]Photoplethysmography (PPG) is a well-known optical method for measuring the change in blood flow. In PPG, a light source at a particular wavelength, typically, red, infra-red or green, is kept at a skin surface and the reflected light is measured and related to blood flow. The change in blood flow can be used to compute vital statistics such as heart rate, respiration rate and other health related statistics. Many consumer fitness devices use PPG to estimate the heart rate of the person wearing the device. PPG based heart rate estimation during motion can be adversely affected by motion artifacts in the PPG signal. The motion artifacts may be caused by, for example, h...

Claims

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Application Information

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IPC IPC(8): A61B5/024A61B5/00
CPCA61B5/02416A61B5/0002A61B5/721A61B5/024A61B5/1118A61B5/7207A61B5/7235A61B5/725A61B5/7257A61B5/7246
Inventor PANDE, TARKESHMAGEE, DAVID PATRICK
Owner TEXAS INSTR INC