Combining measurements from breathing rate sensors
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United States of America Patent
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Jan 15, 2008
Grant Date -
Feb 3, 2005
app pub date -
Dec 13, 2002
filing date -
Dec 14, 2001
priority date (Note) -
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status (Latency Note)
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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.
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