Reduction of physiological metric error due to inertial cadence
First Claim
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1. A heart rate monitor for sensing a heart rate of a user, the heart rate monitor comprising:
- a photoplethysmograph (PPG) sensor configured to;
sense light scattered from a body of the user; and
provide PPG information responsive to the sensed light;
a step rate sensor configured to;
sense motion from the user; and
provide motion information responsive to the sensed motion;
at least one processor circuit configured to;
determine a step rate of a user from the motion information provided by the step rate sensor;
determine an initial instantaneous heart rate from the PPG information provided by the PPG sensor and the motion information provided by the step rate sensor;
compute a difference between the initial instantaneous heart rate and the step rate;
determine a second instantaneous heart rate as a function of the difference; and
output a revised heart rate as a function of the second instantaneous heart rate and a rate limit.
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Abstract
The heart rate monitor disclosed herein removes a step rate component from a measured heart rate by using one or more filtering techniques when the step rate is close to the heart rate. In general, a difference between the step rate and the heart rate is determined, and the step rate is filtered from the heart rate based on a function of the difference.
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Citations
14 Claims
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1. A heart rate monitor for sensing a heart rate of a user, the heart rate monitor comprising:
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a photoplethysmograph (PPG) sensor configured to; sense light scattered from a body of the user; and provide PPG information responsive to the sensed light; a step rate sensor configured to; sense motion from the user; and provide motion information responsive to the sensed motion; at least one processor circuit configured to; determine a step rate of a user from the motion information provided by the step rate sensor; determine an initial instantaneous heart rate from the PPG information provided by the PPG sensor and the motion information provided by the step rate sensor; compute a difference between the initial instantaneous heart rate and the step rate; determine a second instantaneous heart rate as a function of the difference; and output a revised heart rate as a function of the second instantaneous heart rate and a rate limit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of sensing a heart rate of a user comprising:
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sensing light scattered from a body of the user using a photoplethysmograph (PPG) sensor to determine PPG information; sensing motion information from the user using a step rate sensor; determining a step rate of a user from the motion information provided by the step rate sensor; determining an initial instantaneous heart rate from the PPG information provided by the PPG sensor and the motion information provided by the step rate sensor; computing a difference between the initial instantaneous heart rate and the step rate; determining a second instantaneous heart rate as a function of the difference; and outputting a revised heart rate as a function of the second instantaneous heart rate and a rate limit. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification