Motion compensation for optical heart rate sensors
First Claim
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1. A method of optical heart rate sensing, comprising:
- receiving a motion frequency via a motion sensor;
receiving an optical signal from an optical sensor;
filtering the motion frequency from the optical signal;
determining an estimated heart rate frequency based on the filtered optical signal;
reporting a heart rate based on the motion frequency, but not based on the estimated heart rate frequency responsive to a local neighbor magnitude ratio of the estimated heart rate frequency being less than a confidence threshold; and
reporting a heart rate based on the estimated heart rate frequency responsive to the local neighbor magnitude ratio of the estimated heart rate frequency being greater than the confidence threshold.
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Abstract
A method of optical heart rate sensing includes receiving a motion frequency from a motion sensor and receiving an optical signal from an optical sensor. The motion frequency is then filtered from the optical signal, and an estimated heart rate frequency is determined based on the filtered optical signal. A heart rate is reported that is based on the motion frequency, but not based on the estimated heart rate frequency, when a local neighbor magnitude ratio of the estimated heart rate frequency is below a confidence threshold.
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Citations
18 Claims
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1. A method of optical heart rate sensing, comprising:
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receiving a motion frequency via a motion sensor; receiving an optical signal from an optical sensor; filtering the motion frequency from the optical signal; determining an estimated heart rate frequency based on the filtered optical signal; reporting a heart rate based on the motion frequency, but not based on the estimated heart rate frequency responsive to a local neighbor magnitude ratio of the estimated heart rate frequency being less than a confidence threshold; and reporting a heart rate based on the estimated heart rate frequency responsive to the local neighbor magnitude ratio of the estimated heart rate frequency being greater than the confidence threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An optical heart rate sensor, comprising:
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an optical source configured to illuminate one or more blood vessels through a user'"'"'s skin; an optical sensor configured to measure illumination from the one or more blood vessels; one or more motion sensors; and a storage machine holding instructions executable by a logic machine to; receive an optical signal from the optical sensor; receive a motion signal from the one or more motion sensors; determine a motion frequency based on the motion signal; filter the motion frequency from the optical signal; determine an estimated heart rate frequency based on the filtered optical signal; report a heart rate based on the motion frequency, but not based on the estimated heart rate frequency, responsive to a local neighbor magnitude ratio of the estimated heart rate frequency being less than a confidence threshold; and report a heart rate based on the estimated heart rate frequency responsive to the local neighbor magnitude ratio of the estimated heart rate frequency being greater than the confidence threshold. - View Dependent Claims (11, 12, 13, 14)
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15. A method of optical heart rate sensing, comprising:
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receiving a motion frequency via a motion sensor; receiving an optical signal from an optical sensor; filtering the motion frequency from the optical signal with an amount of filtering that is independent of the motion frequency; determining an estimated heart rate frequency based on the filtered optical signal; determining a probability that the estimated heart rate frequency is the current heart rate frequency, including transforming a recent window of the filtered optical signal from a time domain to a frequency domain; determining a magnitude of the estimated heart rate frequency based on the transformed filtered optical signal; and determining magnitudes of heart rate frequencies within a threshold of the estimated heart rate frequency based on the transformed filtered optical signal; and reporting a heart rate based on the estimated heart rate frequency responsive to the probability that the estimated heart rate frequency is the current heart rate frequency being greater than a confidence threshold. - View Dependent Claims (16, 17, 18)
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Specification