MOTION ARTIFACT CANCELATION
First Claim
1. A method of an electronic device including one or more light emitters and a plurality of light sensors, the method comprising:
- emitting light from the one or more light emitters;
receiving first light information from a first light sensor, the first light sensor optically coupled to one of the one or more light emitters;
receiving second light information from a second light sensor, the second light sensor optically coupled to one of the one or more light emitters, wherein the second light information includes time-shifted information; and
computing a heart rate signal wherein noise due to motion artifacts has been canceled by using the first and second light information.
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Accused Products
Abstract
A photoplethysmogram (PPG) signal may be obtained from a pulse oximeter, which employs a light emitter and a light sensor to measure the perfusion of blood to the skin of a user. However, the signal may be compromised by noise due to motion artifacts. That is, movement of the body of a user may cause the skin and vasculature to expand and contract, introducing noise to the signal. To address the presence of motion artifacts, examples of the present disclosure can receive light information from two light sensors situated in a line parallel to the direction of the blood pulse wave. The light information from each sensor may include the same noise signal, and thus subtracting one from the other can result in a heart rate signal where the noise has been canceled out. In some examples, a signal from one of the light sensors may be multiplied by a scaling factor before cancellation to account for response differences in each light sensor.
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Citations
28 Claims
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1. A method of an electronic device including one or more light emitters and a plurality of light sensors, the method comprising:
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emitting light from the one or more light emitters; receiving first light information from a first light sensor, the first light sensor optically coupled to one of the one or more light emitters; receiving second light information from a second light sensor, the second light sensor optically coupled to one of the one or more light emitters, wherein the second light information includes time-shifted information; and computing a heart rate signal wherein noise due to motion artifacts has been canceled by using the first and second light information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9-16. -16. (canceled)
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17. An electronic device, comprising:
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a first light emitter configured to emit first light, the first light including first light information; a second light emitter configured to emit second light, the second light including second light information, the second light information including time-shifted information; a first light sensor configured to receive a reflection of the first light; a second light sensor configured to receive a reflection of the second light; and a processor configured to; compute a heart rate signal using first and second light information, wherein noise due to motion artifacts has been canceled. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification