Processing and detecting baseline changes in signals
First Claim
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1. A method of detecting the occurrence of events from a photoplethysmographic (PPG) signal by a pulse oximeter, comprising:
- receiving, using the pulse oximeter, the PPG signal from a pulse oximetry sensor, wherein the pulse oximetry sensor is configured to detect light attenuated by a subject;
transforming, using the pulse oximeter, the PPG signal to generate a transformed signal;
generating, using the pulse oximeter, a scalogram based at least in part on the transformed signal;
detecting, using the pulse oximeter, an artifact within the scalogram;
calculating characteristics of the detected artifact, the characteristics comprising at least one of size and shape of the detected artifact; and
analyzing, using the pulse oximeter, the characteristics of the detected artifact within the scalogram to detect an occurrence of a physiological event.
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Abstract
Systems and methods for detecting the occurrence of events from a signal are provided. A signal processing system may analyze baseline changes and changes in signal characteristics to detect events from a signal. The system may also detect events by analyzing energy parameters and artifacts in a scalogram of the signal. Further, the system may detect events by analyzing both the signal and its corresponding scalogram.
251 Citations
23 Claims
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1. A method of detecting the occurrence of events from a photoplethysmographic (PPG) signal by a pulse oximeter, comprising:
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receiving, using the pulse oximeter, the PPG signal from a pulse oximetry sensor, wherein the pulse oximetry sensor is configured to detect light attenuated by a subject; transforming, using the pulse oximeter, the PPG signal to generate a transformed signal; generating, using the pulse oximeter, a scalogram based at least in part on the transformed signal; detecting, using the pulse oximeter, an artifact within the scalogram; calculating characteristics of the detected artifact, the characteristics comprising at least one of size and shape of the detected artifact; and analyzing, using the pulse oximeter, the characteristics of the detected artifact within the scalogram to detect an occurrence of a physiological event. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A pulse oximetry system for detecting the occurrence of events from a photoplethysmographic (PPG) signal, comprising:
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a pulse oximetry sensor configured to generate the PPG signal, wherein the pulse oximetry sensor is configured to detect light attenuated by a subject; and a pulse oximeter coupled to the pulse oximetry sensor, wherein the pulse oximeter is configured to; transform the PPG signal to generate a transformed signal; generate a scalogram based at least in part on the transformed signal; detect an artifact within the scalogram; calculate characteristics of the detected artifact, the characteristics comprising at least one of size and shape of the detected artifact; and analyze the characteristics of the detected artifact within the scalogram to detect an occurrence of a physiological event. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A non-transitory computer-readable medium for use in detecting the occurrence of events from a photoplethysmographic (PPG) signal, the computer-readable medium comprising:
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computer program instructions recorded thereon for causing a pulse oximeter to; receive the PPG signal, from a pulse oximetry sensor, wherein the pulse oximetry sensor is configured to detect light attenuated by a subject; transform the signal to generate a transformed signal; generate a scalogram based at least in part on the transformed signal; detect an artifact within the scalogram; calculate characteristics of the detected artifact, the characteristics comprising at least one of size and shape of the detected artifact; and analyze the characteristics of the detected artifact within the scalogram to detect an occurrence of a physiological event.
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Specification