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Signal processing apparatus

  • US 8,942,777 B2
  • Filed: 05/25/2007
  • Issued: 01/27/2015
  • Est. Priority Date: 03/07/1991
  • Status: Expired due to Fees
First Claim
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1. A non-transitory computer useable medium having computer readable code, the computer readable code comprising:

  • code configured to process a plurality of signals to obtain a plurality of principal components, wherein the plurality of signals corresponds to sensed optical energies from a plurality of wavelengths and wherein each of the plurality of signals comprises a source component corresponding to a physiological parameter and an interference component;

    code configured to process the plurality of principal components to obtain a plurality of independent components, wherein a matrix of the plurality of signals corresponds to a matrix product of a matrix of the plurality of independent components and a matrix of mixing coefficients, and wherein the code configured to process the plurality of principal components comprisescode configured to separate the source component from the interference component; and

    code configured to obtain a ratio of mixing coefficients from the matrix of mixing coefficients, wherein the ratio corresponds to a ratio of modulation ratios of red to infrared wavelengths of the plurality of wavelengths; and

    code configured to extract a first measure of the physiological parameter corresponding to the source component from one of the plurality of independent components.

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