Consistent Signal Selection By Signal Segment Selection Techniques
First Claim
1. A method for processing a signal to identify a consistent portion of the signal, comprising:
- obtaining a photoplethysmograph (PPG) signal from a sensor;
selecting a current portion of the PPG signal for analysis;
identifying one or more signal peaks in the current portion of the PPG signal;
processing the one or more signal peaks based on a consistency metric;
comparing the processed one or more signal peaks to the consistency metric to determine if the current portion of the PPG signal is consistent;
responsive to determining that the current portion of the PPG signal is consistent, determining one or more parameters based at least in part on the current portion of the PPG signal; and
responsive to determining that the current portion of the PPG signal is not consistent, selecting a next portion of the PPG signal for analysis.
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Accused Products
Abstract
According to embodiments, techniques for selecting a consistent part of a signal, including a photoplethysmograph (PPG) signal, are disclosed. A pulse oximetry system including a sensor or probe may be used to obtain a PPG signal from a subject. Signal peaks may be identified in the PPG signal. Characteristics of the signal peaks, including the amplitude levels of the signal peaks and/or the time-distance between the signal peaks may be used to determine if the PPG signal is consistent. In an embodiment, signal peaks are processed based on a consistency metric, and the processed signal peaks are compared to the consistency metric to determine if the PPG signal is consistent. If the PPG signal is determined to be consistent, the PPG signal may be further analyzed to determine an underlying signal parameter, including, for example, a patient respiration rate. If the PPG signal is determined to be inconsistent, the inconsistent portion of the signal may be removed from the overall signal or otherwise transformed.
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Citations
20 Claims
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1. A method for processing a signal to identify a consistent portion of the signal, comprising:
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obtaining a photoplethysmograph (PPG) signal from a sensor; selecting a current portion of the PPG signal for analysis; identifying one or more signal peaks in the current portion of the PPG signal; processing the one or more signal peaks based on a consistency metric; comparing the processed one or more signal peaks to the consistency metric to determine if the current portion of the PPG signal is consistent; responsive to determining that the current portion of the PPG signal is consistent, determining one or more parameters based at least in part on the current portion of the PPG signal; and responsive to determining that the current portion of the PPG signal is not consistent, selecting a next portion of the PPG signal for analysis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for processing a signal to identify a consistent portion of the signal, the system comprising:
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a sensor capable of obtaining a photoplethysmograph (PPG) signal; a processor coupled to the sensor, wherein the processor is capable of; selecting a current portion of the PPG signal for analysis; identifying one or more signal peaks in the current portion of the PPG signal; processing the one or more signal peaks based at least in part on a consistency metric; comparing the processed one or more signal peaks to the consistency metric to determine if the current portion of the PPG signal is consistent; responsive to determining that the current portion of the PPG signal is consistent, determine one or more parameters based at least in part on the current portion of the PPG signal; and responsive to determining that the current portion of the PPG signal is not consistent, selecting a next portion of the PPG signal for analysis. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification