Signal processing apparatus
DCFirst Claim
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1. A method of measuring oxygen saturation, the method comprising:
- obtaining first and second signals that are representative of light of first and second wavelengths detected by a light sensitive detector over a period of time, the detected light of first and second wavelengths being attenuated by body tissue carrying pulsing blood;
transforming the first and second signals into the frequency domain;
calculating a plurality of possible oxygen saturation values using a plurality of values of each of the transformed first and second signals that correspond to non-zero frequencies;
selecting one of the plurality of possible oxygen saturation values as an oxygen saturation measurement based upon an analysis to determine which of the plurality of possible oxygen saturation values corresponds to the oxygen saturation of the pulsing blood; and
outputting the oxygen saturation measurement to a user.
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Abstract
The present disclosure describes a method and an apparatus for analyzing measured signals using various processing techniques. In certain embodiments, the measured signals are physiological signals. In certain embodiments, the measurements relate to blood constituent measurements including blood oxygen saturation.
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Citations
16 Claims
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1. A method of measuring oxygen saturation, the method comprising:
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obtaining first and second signals that are representative of light of first and second wavelengths detected by a light sensitive detector over a period of time, the detected light of first and second wavelengths being attenuated by body tissue carrying pulsing blood; transforming the first and second signals into the frequency domain; calculating a plurality of possible oxygen saturation values using a plurality of values of each of the transformed first and second signals that correspond to non-zero frequencies; selecting one of the plurality of possible oxygen saturation values as an oxygen saturation measurement based upon an analysis to determine which of the plurality of possible oxygen saturation values corresponds to the oxygen saturation of the pulsing blood; and outputting the oxygen saturation measurement to a user. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A pulse oximeter comprising:
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an input for receiving from a detector information about light of first and second wavelengths attenuated by body tissue carrying pulsing blood over a period of time; a processor configured to perform a method comprising; transforming first and second signals into the frequency domain, wherein the first and second signals are representative of the light of first and second wavelengths attenuated by body tissue carrying pulsing blood; calculating a plurality of possible oxygen saturation values using a plurality of values of each of the transformed first and second signals that correspond to non-zero frequencies; and selecting one of the plurality of possible oxygen saturation values as an oxygen saturation measurement based upon an analysis to determine which of the plurality of possible oxygen saturation values corresponds to the oxygen saturation of the pulsing blood; and an output for outputting the oxygen saturation measurement. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification