Signal processing apparatus
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Accused Products
Abstract
The present invention involves a method and an apparatus for analyzing measured signals, including the determination of a measurement of correlation in the measured signals during a calculation of a physiological parameter of a monitored patient. Use of this invention is described in particular detail with respect to blood oximetry measurements.
179 Citations
35 Claims
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1-10. -10. (canceled)
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11. A method for measuring a physiological parameter, comprising:
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measuring a plurality of signals, wherein each of said signals comprises a source component corresponding to said physiological parameter and an interference component;
processing said plurality of signals to obtain a plurality of principal components;
processing said plurality of principal components to obtain a plurality of independent components, wherein a matrix of said plurality of signals corresponds to a matrix product of a matrix of said plurality of independent components and a matrix of mixing coefficients; and
extracting a first measure of said physiological parameter corresponding to said source component from one of said plurality of independent components, wherein said plurality of signals corresponds to sensed optical energies from a plurality of wavelengths. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A method for measuring a physiological parameter, comprising:
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measuring a plurality of signals, wherein each of said signals comprises a source component corresponding to said physiological parameter and an interference component;
processing said plurality of signals to obtain a plurality of principal components;
processing said plurality of principal components to obtain a plurality of independent components, wherein a matrix of said plurality of signals corresponds to a matrix product of a matrix of said plurality of independent components and a matrix of mixing coefficients; and
extracting a first measure of said physiological parameter corresponding to said source component from one of said plurality of independent components, wherein said physiological parameter is a function of a pulse rate.
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21. A method for measuring a physiological parameter, comprising:
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measuring a plurality of signals, wherein each of said signals comprises a source component corresponding to said physiological parameter and an interference component;
processing said plurality of signals to obtain a plurality of principal components;
processing said plurality of principal components to obtain a plurality of independent components, wherein a matrix of said plurality of signals corresponds to a matrix product of a matrix of said plurality of independent components and a matrix of mixing coefficients; and
extracting a first measure of said physiological parameter corresponding to said source component from one of said plurality of independent components, wherein said plurality of signals corresponds to sensed optical energies from a plurality of wavelengths from different times.
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22. A method for measuring a physiological parameter, comprising:
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measuring a plurality of signals, wherein each of said signals comprises a source component corresponding to said physiological parameter and an interference component;
processing said plurality of signals to obtain a plurality of principal components;
processing said plurality of principal components to obtain a plurality of independent components, wherein a matrix of said plurality of signals corresponds to a matrix product of a matrix of said plurality of independent components and a matrix of mixing coefficients; and
extracting a first measure of said physiological parameter corresponding to said source component from one of said plurality of independent components, wherein said first measure of a physiological parameter corresponds to a pulse rate.
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23. A pulse oximeter, comprising:
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a sensor configured for measuring a plurality of signals, wherein each of said signals comprises a source component corresponding to said physiological parameter and an interference component;
a computer useable medium having computer readable code embodied therein for measuring a physiological parameter, said computer readable code configured to execute functions comprising;
processing said plurality of signals to obtain a plurality of principal components;
processing said plurality of principle components to obtain a plurality of independent components, wherein a matrix of said plurality of signals corresponds to a matrix product of a matrix of said plurality of independent components and a matrix of mixing coefficients; and
extracting a first measure of said physiological parameter corresponding to said source component from one of said plurality of independent components, wherein said physiological parameter is a pulse rate.
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24. A pulse oximeter, comprising:
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a sensor configured for measuring a plurality of signals, wherein each of said signals comprises a source component corresponding to said physiological parameter and an interference component;
a computer useable medium having computer readable code embodied therein for measuring a physiological parameter, said computer readable code configured to execute functions comprising;
processing said plurality of signals to obtain a plurality of principal components;
processing said plurality of principle components to obtain a plurality of independent components, wherein a matrix of said plurality of signals corresponds to a matrix product of a matrix of said plurality of independent components and a matrix of mixing coefficients; and
extracting a first measure of said physiological parameter corresponding to said source component from one of said plurality of independent components, wherein said plurality of signals corresponds to sensed optical energies from a plurality of wavelengths. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. A pulse oximeter, comprising:
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a sensor configured for measuring a plurality of signals, wherein each of said signals comprises a source component corresponding to said physiological parameter and an interference component;
a computer useable medium having computer readable code embodied therein for measuring a physiological parameter, said computer readable code configured to execute functions comprising;
processing said plurality of signals to obtain a plurality of principal components;
processing said plurality of principle components to obtain a plurality of independent components, wherein a matrix of said plurality of signals corresponds to a matrix product of a matrix of said plurality of independent components and a matrix of mixing coefficients; and
extracting a first measure of said physiological parameter corresponding to said source component from one of said plurality of independent components, wherein said plurality of signals corresponds to sensed optical energies from a plurality of wavelengths from different times.
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Specification