Detecting A Probe-Off Event In A Measurement System
First Claim
1. A method of detecting a probe-off event comprising:
- obtaining a signal;
generating a wavelet transform based at least in part on the signal;
generating a scalogram based at least in part on the wavelet transform;
determining one or more characteristics from the scalogram;
analyzing the one or more characteristics; and
detecting a probe-off event based at least in part on the one or more characteristics.
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Abstract
According to embodiments, techniques for detecting probe-off events 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, an energy decrease, a broadscale high-energy cone, a regular, repeated high-scale pattern, a low-scale information pattern; and a pulse band. The absence or presence of these and other characteristics, along with information about the characteristics, may be analyzed to detect a probe-off event. A confidence indicator may be calculated in connection with probe-off event detections and alarms may be generated when probe-off events occur.
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Citations
20 Claims
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1. A method of detecting a probe-off event comprising:
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obtaining a signal; generating a wavelet transform based at least in part on the signal; generating a scalogram based at least in part on the wavelet transform; determining one or more characteristics from the scalogram; analyzing the one or more characteristics; and detecting a probe-off event based at least in part on the one or more characteristics. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for detecting a probe-off event comprising:
a processor capable of; obtaining a signal; generating a wavelet transform based at least in part on the signal; generating a scalogram based at least in part on the wavelet transform; determining one or more characteristics from the scalogram; analyzing the one or more characteristics; and detecting a probe-off event based at least in part on the one or more characteristics. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A computer-readable medium for detecting a probe-off event, the computer-readable medium having computer program instructions recorded thereon for:
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obtaining a signal; generating a wavelet transform based at least in part on the signal; generating a scalogram based at least in part on the wavelet transform; determining one or more characteristics from the scalogram; analyzing the one or more characteristics; and detecting a probe-off event based at least in part on the one or more characteristics. - View Dependent Claims (20)
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Specification