Signal processing apparatus
First Claim
1. A method for indicating the constituency of material, said method comprising the steps of:
- receiving a first signal comprising a measurement from said material;
combining said first signal and a plurality of reference signals in an adaptive filter to provide a plurality of output signals corresponding to each of said plurality of reference signals, wherein said output signals are indicative of potential constituency of said material; and
selecting from said plurality of output signals a value for said constituency of said material.
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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.
1188 Citations
16 Claims
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1. A method for indicating the constituency of material, said method comprising the steps of:
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receiving a first signal comprising a measurement from said material;
combining said first signal and a plurality of reference signals in an adaptive filter to provide a plurality of output signals corresponding to each of said plurality of reference signals, wherein said output signals are indicative of potential constituency of said material; and
selecting from said plurality of output signals a value for said constituency of said material. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of determining blood oxygen saturation comprising the steps of:
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receiving at least one measurement signal;
adaptively filtering said at least one measurement signal based upon a plurality of noise estimate signals to generate a plurality of output signals corresponding to each of said plurality of noise estimate signals, wherein said output signals are indicative of potential constituency of said material; and
selecting from said plurality of output signals a value for said constituency of said material. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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Specification