Detecting a signal quality decrease in a measurement system
First Claim
1. A method of detecting a signal quality decrease event comprising:
- obtaining a signal;
computing a continuous wavelet transform of the signal;
generating a scalogram based at least in part on the wavelet transform;
analyzing one or more characteristics of the scalogram; and
determining whether a signal quality decrease event has occurred based at least in part on the analysis.
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Accused Products
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.
102 Citations
20 Claims
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1. A method of detecting a signal quality decrease event comprising:
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obtaining a signal; computing a continuous wavelet transform of the signal; generating a scalogram based at least in part on the wavelet transform; analyzing one or more characteristics of the scalogram; and determining whether a signal quality decrease event has occurred based at least in part on the analysis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for detecting a signal quality decrease event comprising:
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a sensor capable of obtaining a signal; a processor capable of; computing a continuous wavelet transform of the signal; generating a scalogram based at least in part on the wavelet transform; analyzing one or more characteristics of the scalogram; and determining whether a signal quality decrease event has occurred based at least in part on the analysis. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A computer-readable medium for use in detecting a signal quality decrease event, the computer-readable medium having computer program instructions recorded thereon for:
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obtaining a signal; computing a continuous wavelet transform of the signal; generating a scalogram based at least in part on the wavelet transform; analyzing one or more characteristics of the scalogram; and determining whether a signal quality decrease event has occurred based at least in part on the analysis. - View Dependent Claims (20)
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Specification