Signal processing apparatus
DCFirst Claim
1. A method of improving the determination of a physiological parameter based upon physiological signals, said method comprising the steps of:
- sensing a physiological signal indicative of the physiological parameter, said physiological signal having a desired portion and an undesired portion, said physiological parameter having a predetermined range of possible values;
based upon said physiological signal, determining at least two possible indications of said physiological parameter based on at least two alternative calculations for said physiological parameter; and
analyzing said at least two possible indications to determine a resulting indication that likely most closely correlates to the physiological parameter.
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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.
1257 Citations
52 Claims
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1. A method of improving the determination of a physiological parameter based upon physiological signals, said method comprising the steps of:
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sensing a physiological signal indicative of the physiological parameter, said physiological signal having a desired portion and an undesired portion, said physiological parameter having a predetermined range of possible values; based upon said physiological signal, determining at least two possible indications of said physiological parameter based on at least two alternative calculations for said physiological parameter; and analyzing said at least two possible indications to determine a resulting indication that likely most closely correlates to the physiological parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A physiological monitor which receives physiological signals indicative of at least one physiological parameter, said physiological parameter having a predetermined range of possible values, comprising:
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a physiological indication calculation module which responds to said physiological signals to determine a plurality of possible physiological indication values based upon alternative determination methods; an analysis module responsive to said plurality of indication values to qualify said plurality of indication values to be considered as a possible resulting indications for said physiological parameter; and a selection module responsive to the result of said scan to identify at least one resulting indication as representative of said physiological parameter. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
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45. A method of improving the determination of a physiological parameter based upon physiological signals, said method comprising the steps of:
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sensing a physiological signal indicative of the physiological parameter, said physiological parameter having a predetermined range of possible values; in response to said physiological signal, determining a plurality of possible indications of said physiological parameter based on a scan of a plurality of possible values for said physiological parameter within said predetermined range of possible values for said physiological parameter; and analyzing said plurality of possible indications to determine a resulting indication that likely most closely correlates to the physiological parameter. - View Dependent Claims (46, 47, 48, 49, 50, 51, 52)
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Specification