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US 8,410,951 B2Granted
Detecting a signal quality decrease in a measurement system
AssigneeCovidien LP
InventorsJames Nicholas Watson, Paul Stanley Addison
Life of this patent
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AssigneeCovidien LP
InventorsJames Nicholas Watson, Paul Stanley Addison
Estimating the term…
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.
A method of detecting a signal quality decrease event comprising:
A system for detecting a signal quality decrease event comprising:
A computer-readable medium for use in detecting a signal quality decrease event, the computer-readable medium having computer program instructions recorded thereon for:
Dependencies are inferred from the claim text.