REDUCING CROSS-TALK IN A MEASUREMENT SYSTEM
First Claim
1. A method of determining one or more physiological characteristics in a measurement system comprising:
- detecting at least two wavelengths of radiation at a detector, the detector outputting at least two respective output signals;
processing the at least two output signals to reduce cross-talk to produce at least two processed signals;
transforming at least one of the at least two processed signals at least in part using a continuous wavelet transform;
generating a scalogram based at least in part on the wavelet transform; and
analyzing one or more characteristics of the scalogram to determine one or more physiological characteristics.
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Accused Products
Abstract
According to embodiments, techniques for determining one or more physiological characteristics in a measurement system which may include cross-talk are disclosed. A sensor or probe may be used to generate two or more a plethysmograph or photoplethysmograph (PPG) signals from a patient. The obtained signals may include an infrared signal and a red signal, and may be subject to an additional measurement noise. The obtained signal may be combined to form a detected signal. The detected signal may be filtered to partially or fully remove noise. The filtered detected signal may be demodulated to separate the red signal and the infrared signal. The recovered red and infrared signals may be processed by additional filters to partially or fully remove cross-talk. The processed red and infrared signals may then be used to determine physiological characteristics of a patient such as a pulse rate, a respiration rate, and a blood oxygen saturation level using the wavelet transform and/or scalogram of at least one of the processed red and infrared signals. The partial or full removal of cross-talk from the red signal and infrared signal may result in a more reliable determination of physiological characteristics than would be possible in a system in which cross-talk was not removed.
74 Citations
20 Claims
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1. A method of determining one or more physiological characteristics in a measurement system comprising:
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detecting at least two wavelengths of radiation at a detector, the detector outputting at least two respective output signals; processing the at least two output signals to reduce cross-talk to produce at least two processed signals; transforming at least one of the at least two processed signals at least in part using a continuous wavelet transform; generating a scalogram based at least in part on the wavelet transform; and analyzing one or more characteristics of the scalogram to determine one or more physiological characteristics. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for determining one or more physiological characteristics in a measurement system comprising:
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a sensor capable of; detecting at least two wavelengths of radiation at a detector, and outputting at least two respective output signals; and a processor capable of; processing the at least two output signals to reduce cross-talk to produce at least two processed signals, transforming at least one of the at least two processed signals at least in part using a continuous wavelet transform, generating a scalogram based at least in part on the wavelet transform, and analyzing one or more characteristics of the scalogram to determine one or more physiological characteristics. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A computer-readable medium for use in determining one or more physiological characteristics in a measurement system, the computer-readable medium having computer program instructions recorded thereon for:
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detecting at least two wavelengths of radiation at a detector; the detector outputting at least two respective output signals; processing the at least two output signals to reduce cross-talk to produce at least two processed signals; transforming at least one of the at least two processed signals at least in part using a continuous wavelet transform; generating a scalogram based at least in part on the wavelet transform; and analyzing one or more characteristics of the scalogram to determine one or more physiological characteristics. - View Dependent Claims (20)
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Specification