Detecting a signal quality decrease in a measurement system
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United States of America Patent
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Dec 31, 2013
Grant Date -
Sep 5, 2013
app pub date -
Mar 29, 2013
filing date -
Sep 30, 2008
priority date (Note) -
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Abstract
Techniques for detecting a signal quality decrease are disclosed. A sensor or probe may be used to obtain a plethysmograph or photoplethysmograph (PPG) signal from a subject. A wavelet transform of the signal may be performed and a scalogram may be generated based at least in part on the wavelet transform. One or more characteristics of the scalogram may be determined. The determined characteristics may include, for example, energy values and energy structural characteristics in a pulse band, a mains hum band, and/or a noise band. Such characteristics may be analyzed to produce signal quality values and associated signal quality trends. One or more signal quality values and signal quality trends may be used to determine if a signal quality decrease has occurred or is likely to occur.
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