Combining measurements from different sensors
First Claim
1. A method of measuring a parameter comprising using a suitably programmed computer to perform steps including:
- predicting a value of each of two independent measurements of the parameter for two independent measurement channels, making two independent measurements of the parameter via said two independent measurement channels to produce two measured values of the parameter, calculating respective differences between the predicted values and the measured values for each of said two independent measurement channels, combining the two measured values with weights which vary inversely with said respective differences to produce a combined value, and outputting the combined value to a user.
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Accused Products
Abstract
A method for combining measurements from two or more independent measurement channels, particularly physiological measurements such as heart rate. Independent measurements of heart rate, for instance by ECG and pulse oximetry, can be combined to derive an improved measurement eliminating artefacts on one channel. A model of the process generating the physiological parameter, e.g., the heart rate, is constructed and is run independently for each channel to generate predictions of the parameter. The measured values are compared with the predicted values and the differences are used as an indication of the confidence in the measurement. The measurements from the two channels are ombined using weights calculated from the respective differences.
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Citations
29 Claims
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1. A method of measuring a parameter comprising using a suitably programmed computer to perform steps including:
- predicting a value of each of two independent measurements of the parameter for two independent measurement channels, making two independent measurements of the parameter via said two independent measurement channels to produce two measured values of the parameter, calculating respective differences between the predicted values and the measured values for each of said two independent measurement channels, combining the two measured values with weights which vary inversely with said respective differences to produce a combined value, and outputting the combined value to a user.
- View Dependent Claims (2, 3, 4, 5, 6, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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7. A method of measuring a parameter comprising using a suitably programmed computer to perform steps including:
- predicting a value of each of two independent measurements of the parameter for two independent measurement channels, making two independent measurements of the parameter via said two independent measurement channels to produce two measured values of the parameter, calculating respective differences between the predicted values and the measured values for each of said two independent measurement channels, combining the two measured values with weights determined by said respective differences to produce a combined value M, and outputting the combined value to a user, wherein the two measured values are combined according to the formula;
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- predicting a value of each of two independent measurements of the parameter for two independent measurement channels, making two independent measurements of the parameter via said two independent measurement channels to produce two measured values of the parameter, calculating respective differences between the predicted values and the measured values for each of said two independent measurement channels, combining the two measured values with weights determined by said respective differences to produce a combined value M, and outputting the combined value to a user, wherein the two measured values are combined according to the formula;
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12. A method of measuring a parameter comprising using a suitably programmed computer to perform steps including:
- predicting a value of each of two independent measurements of the parameter for two independent measurement channels using respective models for measurement of the parameter, making two independent measurements of the parameter via said two independent measurement channels to produce two measured values of the parameter, calculating respective differences between the predicted values and the measured values for each of said two independent measurement channels, combining the two measured values with weights which vary inversely with said respective differences to produce a combined value, and outputting the combined value to a user, wherein the respective models comprise Kalman filters.
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22. A method of measuring a physiological parameter comprising using a suitably programmed computer to perform steps including:
- predicting by use of respective Kalman filters a value of each of two independent measurements of the physiological parameter for two independent measurement channels, making two independent measurements of the physiological parameter via the two independent measurement channels to produce two measured values of the physiological parameter, calculating respective differences between the predicted values and the measured values for each of the two independent measurement channels, combining the two measured values with weights which vary inversely with which vary inversely with the respective differences to produce a physiological parameter measurement, and outputting the physiological parameter measurement to a user.
- View Dependent Claims (23, 24, 25)
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26. A method of measuring a parameter comprising using a suitably programmed computer to perform steps including:
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predicting a value of each of two independent measurements of the parameter for two independent measurement channels; making two independent measurements of the parameter via said two independent measurement channels to produce two measured current values of the parameter; calculating respective differences between the predicted values and the measured current values for each of said two independent measurement channels; and combining the two measured current values with weights which vary inversely with said respective differences to produce and output to a user a measurement of the parameter which is based on the two measured current values.
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27. A method of measuring a parameter comprising using a suitably programmed computer to perform steps including:
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predicting a value of each of two independent measurements of the parameter for two independent measurement channels; making two independent measurements of the parameter via said two independent measurement channels to produce two measured current values of the parameter; calculating respective differences between the predicted values and the measured current values for each of said two independent measurement channels; combining the two measured current values with weights which vary inversely with said respective differences to produce a measurement of the parameter which is based on the two measured current values; and displaying the measurement of the parameter. - View Dependent Claims (28, 29)
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Specification