Signal processing apparatus
First Claim
1. A system for the enhancement of physiological signals for the measurement of blood oxygen in a subject, the system comprising:
- first and second light sources to direct light toward the subject, said first and second light sources producing light of first and second wavelengths, respectively;
a light detector positioned to detect first and second light signals after interacting with the subject and to generate signals indicative of an intensity of said first and second detected light signals, said first detected signal having a first portion arising from light transmitted from said first source and a second portion arising from a first interference source, said second detected signal having a first portion arising from light transmitted from said second source and a second portion arising from a second interference source;
a storage location containing a mathematical relationship of said first and second portions of said first and second detected signals and a first ratio of said first portion of said first detected signal to said first portion of said second detected signal;
an analyzer coupled to said storage location to determine a plurality of possible values for said mathematical relationship over a predetermined range of said first ratio; and
a calculator to determine a selected value from said plurality of possible values for said first ratio based on said plurality of values.
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Accused Products
Abstract
The present invention involves method and apparatus for analyzing two measured signals that are modeled as containing primary and secondary portions. Coefficients relate the two signals according to a model defined in accordance with the present invention. In one embodiment, the present invention involves utilizing a transformation which evaluates a plurality of possible signal coefficients in order to find appropriate coefficients. Alternatively, the present invention involves using statistical functions or Fourier transform and windowing techniques to determine the coefficients relating to two measured signals. Use of this invention is described in particular detail with respect to blood oximetry measurements.
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Citations
28 Claims
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1. A system for the enhancement of physiological signals for the measurement of blood oxygen in a subject, the system comprising:
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first and second light sources to direct light toward the subject, said first and second light sources producing light of first and second wavelengths, respectively;
a light detector positioned to detect first and second light signals after interacting with the subject and to generate signals indicative of an intensity of said first and second detected light signals, said first detected signal having a first portion arising from light transmitted from said first source and a second portion arising from a first interference source, said second detected signal having a first portion arising from light transmitted from said second source and a second portion arising from a second interference source;
a storage location containing a mathematical relationship of said first and second portions of said first and second detected signals and a first ratio of said first portion of said first detected signal to said first portion of said second detected signal;
an analyzer coupled to said storage location to determine a plurality of possible values for said mathematical relationship over a predetermined range of said first ratio; and
a calculator to determine a selected value from said plurality of possible values for said first ratio based on said plurality of values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for the enhancement of physiological signals representative of a physiological phenomenon characteristic in a subject body tissue carrying pulsing blood, the system comprising:
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a sensor configured to be positioned in proximity with the subject body tissue to detect physiological signals and to generate signals indicative of said detected physiological signals when positioned in proximity with the subject body tissue, said detected signals having a first portion arising from the physiological phenomenon characteristic and a second portion arising from an interference source;
an analyzer to analyze and determine a value for from said generated signals, said value being indicative of complications of said generated signals; and
a processor, responsive to said value, to generate a processed signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method for enhancement of physiological signals for the measurement of blood oxygen in a subject, the method comprising the steps of:
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producing light of first and second wavelengths;
directing light of said first and second wavelengths toward the subject;
detecting first and second light signals after interacting with the subject and generating signals indicative of an intensity of said first and second detected light signals, said first detected signal having a first portion arising from light transmitted with said first wavelength and a second portion arising from a first interference source, said second detected signal having a first portion arising from light transmitted with said second wavelength and a second portion arising from a second interference source;
analyzing said first and second detected signals using a mathematical relationship of said first and second portions of said first and second detected signals and a first ratio of said first portion of said first detected signal to said first portion of said second detected signal to determine a plurality of possible values for said mathematical relationship over a predetermined range of said first ratio; and
determining a selected value from said plurality of possible values for said first ratio based on said plurality of values. - View Dependent Claims (22, 23, 24)
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25. A method for the enhancement of physiological measurements in a subject, the method comprising the steps of:
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using a plurality of light sources, each producing light of a different predetermined wavelength;
directing light of said predetermined wavelengths toward the subject;
detecting a plurality of light signals after interacting with the subject and generating signals indicative of an intensity of said plurality of detected light signals, each of said detected signals having a first portion arising from light transmitted with one of said predetermined wavelength and a second portion arising from an interference source;
analyzing said plurality of detected signals using a mathematical relationship of said first and second portions of said plurality of detected signals and a first ratio of said first portion of a first of said plurality of detected signals to said first portion of a second of said plurality of detected signals to determine a plurality of possible values for said mathematical relationship over a predetermined range of said first ratio; and
determining a selected value from said plurality of possible values for said first ratio based on said plurality of values. - View Dependent Claims (26)
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27. A method for the enhancement of physiological signals representative of a physiological phenomenon characteristic in a subject body tissue carrying pulsing blood, the method comprising the steps of:
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positioning a sensor in proximity with the subject body tissue to detect physiological signals and to generate signals indicative of said detected physiological signals, said detected signals having a first portion arising from the physiological phenomenon characteristic and a second portion arising from an interference source;
analyzing said generated signals to determine a value for from said generated signals, said value being indicative of complications of said generated signals; and
processing said generated signals using said value to generate processed signals. - View Dependent Claims (28)
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Specification