Accuracy of heart rate estimation from photoplethysmographic (PPG) signals
First Claim
1. A heart rate monitoring (HRM) circuit comprising:
- an analog front end (AFE) configured to receive a Photoplethysmographic (PPG) signal and configured to generate a fine PPG signal;
a motion cancellation circuit coupled to the AFE and configured to receive the fine PPG signal and an accelerometer signal, the motion cancellation circuit configured to subtract the accelerometer signal from the fine PPG signal to generate a coarse heart rate;
a peak detector coupled to the motion cancellation circuit and the AFE, and configured to generate an instantaneous heart rate; and
a filter coupled to the peak detector, and configured to generate an estimated heart rate from the instantaneous heart rate, wherein the estimated heart rate is provided as a feedback to the peak detector, and the peak detector generates the instantaneous heart rate from the coarse heart rate, the fine PPG signal and the estimated heart rate.
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Accused Products
Abstract
The disclosure provides a heart rate monitor (HRM) circuit. The HRM circuit includes an analog front end (AFE). The AFE receives a Photoplethysmographic (PPG) signal, and generates a fine PPG signal. A motion cancellation circuit is coupled to the AFE, and receives the fine PPG signal and an accelerometer signal. The motion cancellation circuit subtracts the accelerometer signal from the fine PPG signal to generate a coarse heart rate. A peak detector is coupled to the motion cancellation circuit and the AFE, and generates an instantaneous heart rate. A filter is coupled to the peak detector, and generates an estimated heart rate from the instantaneous heart rate, the estimated heart rate is provided as a feedback to the peak detector.
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Citations
20 Claims
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1. A heart rate monitoring (HRM) circuit comprising:
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an analog front end (AFE) configured to receive a Photoplethysmographic (PPG) signal and configured to generate a fine PPG signal; a motion cancellation circuit coupled to the AFE and configured to receive the fine PPG signal and an accelerometer signal, the motion cancellation circuit configured to subtract the accelerometer signal from the fine PPG signal to generate a coarse heart rate; a peak detector coupled to the motion cancellation circuit and the AFE, and configured to generate an instantaneous heart rate; and a filter coupled to the peak detector, and configured to generate an estimated heart rate from the instantaneous heart rate, wherein the estimated heart rate is provided as a feedback to the peak detector, and the peak detector generates the instantaneous heart rate from the coarse heart rate, the fine PPG signal and the estimated heart rate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for monitoring heart rate of a person comprising:
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receiving a Photoplethysmographic (PPG) signal; generating a fine PPG signal from the PPG signal; subtracting an accelerometer signal from the fine PPG signal to generate a coarse heart rate; generating an instantaneous heart rate in a peak detector; and filtering the instantaneous heart rate to generate an estimated heart rate, wherein the estimated heart rate is provided as a feedback to the peak detector, and the instantaneous heart rate is generated from the coarse heart rate, the fine PPG signal and the estimated heart rate. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A device comprising:
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a processing unit; and a heart rate monitoring (HRM) circuit coupled to the processing unit, the HRM circuit comprising; an analog front end (AFE) configured to receive a Photoplethysmographic (PPG) signal and configured to generate a fine PPG signal; a motion cancellation circuit coupled to the AFE and configured to receive the fine PPG signal and an accelerometer signal, the motion cancellation circuit configured to subtract the accelerometer signal from the fine PPG signal to generate a coarse heart rate; a peak detector coupled to the motion cancellation circuit, and configured to generate an instantaneous heart rate; and a filter coupled to the peak detector, and configured to generate an estimated heart rate from the instantaneous heart rate, wherein the estimated heart rate is provided as a feedback to the peak detector, and the peak detector generates the instantaneous heart rate from the coarse heart rate, the fine PPG signal and the estimated heart rate. - View Dependent Claims (19, 20)
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Specification