Physiological Metric Estimation Rise and Fall Limiting

摘要

Methods and apparatus disclosed herein use a filtering technique to improve the accuracy of the results achieved when processing data provided by a physiological sensor. The disclosed filtering technique corrects many of the accuracy problems associated with physiological sensors, particularly PPG sensors. Broadly, the filtering technique adjusts a current filtered estimate of a physiological metric as a function of a rate limit based on a comparison between an instantaneous estimate of the physiological metric and the current filtered estimate.

主权项

1. A physiological processor configured to process a waveform provided by a photoplethysmography sensor, the processor comprising:
a spectral transformer configured to determine, based on the waveform, an instantaneous estimate of a heart rate; and a filter configured to:
compare the instantaneous estimate to a current filtered estimate of the heart rate; andoutput a revised filtered estimate of the heart rate computed as a function of the current filtered estimate and a rate limit based on the comparison between the instantaneous estimate and the current filtered estimate.