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;
determine a revised heart rate, responsive to whether the initial instantaneous heart rate is within a first crossover window relative to the step rate, from the initial instantaneous heart rate and the step rate;
determine an output heart rate from the revised heart rate; and
output the output heart rate.
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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
18 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; determine a revised heart rate, responsive to whether the initial instantaneous heart rate is within a first crossover window relative to the step rate, from the initial instantaneous heart rate and the step rate; determine an output heart rate from the revised heart rate; and output the output heart rate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. 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, said PPG sensor providing PPG information responsive to the sensed light; sensing motion from the user using a step rate sensor, said step rate sensor providing motion information responsive to the sensed motion; 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; determining a revised heart rate, responsive to whether the initial instantaneous heart rate is within a first crossover window relative to the step rate, from the initial instantaneous heart rate and the step rate; determining an output heart rate from the revised heart rate; and outputting the output heart rate to the user. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification