Patent ID: 7343187

Claim:
A 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 comprises code 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.