Combining measurements from breathing rate sensors
First Claim
1. A method of measuring breathing rate of a subject comprising the steps of:
- predicting a value of each of two independent measurements of the breathing rate for two independent measurement channels, making two independent measurements of the breathing rate via said two independent measurement channels to produce two measured values of the breathing rate, calculating respective differences between the predicted values and the measured values for each of said two independent measurement channels, and combining the two measured values with weights determined by said differences.
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Abstract
A method for combining breathing rate measurements from two or more independent measurement channels. Independent measurements of breathing rate, for instance by impedance pneumography and photoplethysmography, can be combined to derive an improved measurement eliminating artefacts on one channel. A model of the process generating the breathing rate, is constructed and is run independently for each channel to generate predictions of the breathing rate. The model may be a Kalman filter. The measured values are compared with the predicted values and the difference is used as an indication of the confidence in the measurement, the higher the difference the lower the confidence. The measurements from the two channels are combined using weights calculated from the respected differences.
212 Citations
20 Claims
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1. A method of measuring breathing rate of a subject comprising the steps of:
- predicting a value of each of two independent measurements of the breathing rate for two independent measurement channels, making two independent measurements of the breathing rate via said two independent measurement channels to produce two measured values of the breathing rate, calculating respective differences between the predicted values and the measured values for each of said two independent measurement channels, and combining the two measured values with weights determined by said differences.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. Apparatus for measuring breathing rate of a subject, the apparatus comprising:
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two independent measurement channels for receiving two independent measurements of a breathing rate as two measured values of the breathing rate; and a processor configured to predict values of each of the two independent measurements of the breathing rate for the two independent measurement channels, to calculate respective differences between the predicted values and the measured values for each of said two independent measurement channels, and to combine the two measured values with weights determined by said differences. - View Dependent Claims (19)
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20. Apparatus for measuring breathing rate of a subject, the apparatus comprising:
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first and second independent measurement channels for providing respective independent measurements of a breathing rate as first and second measured values of the breathing rate; and a processor configured to predict values of each of the first and second independent measurements of the breathing rate for the respective first and second independent measurement channels using respective Kalman filters, to calculate respective differences between the predicted values and the measured values for each of the first and second independent measurement channels, and to combine the first and second measured values with weights determined by the differences.
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Specification