Signal processing warping technique
First Claim
1. A method for measuring a physiological parameter of a human, comprising the acts of:
- analyzing, by using a processor, an energy density of a signal having a physiological component and a non-physiological component to determine one or more changes in the energy density of the signal over time;
determining, by using the processor, based on the one or more changes in the energy density of the signal over time, a warping function configured to enable identification of characteristics of the signal corresponding to the non-physiological component;
stretching or compressing along a time scale, by using the processor, the signal having the physiological component and the non-physiological component by using the warping function to produce a warped signal;
stretching or compressing, by using the processor, a signal quality indicator by using the warping function to produce a warped signal quality indicator;
identifying, by using the processor, the non-physiological component of the signal based on an analysis of the warped signal with the warped signal quality indicator; and
using the physiological component of the signal and disregarding the non-physiological component of the signal to determine the physiological parameter.
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Accused Products
Abstract
Methods and systems are provided for using time-frequency warping to analyze a physiological signal. One embodiment includes applying a warping operator to the physiological signal based on the energy density of the signal. The warped physiological signal may be analyzed to determine whether non-physiological signal components are present. Further, the same warping operator may be applied to signal quality indicators, and the warped physiological signal may be analyzed based on the warped signal quality indicators. Non-physiological signal components, or types of non-physiological noise sources, may be identified based on a comparison of the physiological signal with the signal quality indicators. Non-physiological signal components may also be identified based on a neural network of known noise functions. In some embodiments, the non-physiological signal components may be removed to increase accuracy in estimating physiological parameters.
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Citations
21 Claims
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1. A method for measuring a physiological parameter of a human, comprising the acts of:
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analyzing, by using a processor, an energy density of a signal having a physiological component and a non-physiological component to determine one or more changes in the energy density of the signal over time; determining, by using the processor, based on the one or more changes in the energy density of the signal over time, a warping function configured to enable identification of characteristics of the signal corresponding to the non-physiological component; stretching or compressing along a time scale, by using the processor, the signal having the physiological component and the non-physiological component by using the warping function to produce a warped signal; stretching or compressing, by using the processor, a signal quality indicator by using the warping function to produce a warped signal quality indicator; identifying, by using the processor, the non-physiological component of the signal based on an analysis of the warped signal with the warped signal quality indicator; and using the physiological component of the signal and disregarding the non-physiological component of the signal to determine the physiological parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 21)
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9. A method for measuring a physiological parameter of a human, comprising the acts of:
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analyzing, by using a processor, an energy density of a signal having a physiological component and a non-physiological component to determine one or more changes in the energy density of the signal over time; determining, by using the processor, based on the one or more changes in the energy density of the signal over time, a warping function configured to enable identification of characteristics of the signal corresponding to the non-physiological component; stretching or compressing along a time scale, by using the processor, the signal having the physiological component and the non-physiological component by using the warping function to produce a warped signal; stretching or compressing along a time scale, by using the processor, a signal quality indicator by using the warping function to produce a warped signal quality indicator; analyzing, by using the processor, the warped signal and the warped signal quality indicator; identifying, by using the processor, the non-physiological component of the signal based on the analysis of the warped signal and the warped signal quality indicator; and using the physiological component of the signal and disregarding the non-physiological component of the signal to determine the physiological parameter. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A pulse oximetry system, comprising:
data processing circuitry configured to; analyze a three dimensional time-frequency representation of a signal comprising a physiological component and a non-physiological component to determine one or more changes in the energy density of the signal over time, to determine, based on the one or more changes in the energy density of the signal over time, a warping operator configured to enable identification of the non-physiological component; warp the signal, via the processor, with the warping operator to produce a warped signal; warp a signal quality indicator, via the processor, with the warping operator to produce a warped signal quality indicator; identify the non-physiological component of the signal based on a comparison of the warped signal and the warped signal quality indicator; and determine a physiological parameter by disregarding the non-physiological component of the signal and by using the physiological component of the signal. - View Dependent Claims (16, 17, 18, 19, 20)
Specification