Patent ID: 6408198
Filing Date: 2002-06-18
Classification: A61B

Abstract:
An apparatus for use in a measurement instrument which includes at least one illumination source for generating a plurality of light signals at least at two different center wavelengths corresponding to at least two different channels and transmitting said light signals relative to a tissue of a test subject and a sensor configured to receive said light signals transmitted relative to the tissue and to convert the light signals received into output signals, said apparatus comprising:a first data storage for storing input data sets representing multiple determined time periods of said output signals, each of said input data sets including first channel data including multiple values based on a first one of said light signals corresponding to a first one of said channels and second channel data including multiple values based on a second one of said light signals corresponding to a second one of said channels; a first processor configured to receive said input data from said first data storage and perform a multichannel noise analysis involving said first channel data and said second channel data for each of said data sets, and to thereby process said input data sets to output processed data, where said processed data includes multiple output data sets, corresponding to a plurality of said determined time periods, which are selectively modified on a set-by-set basis based on said multichannel noise analysis; a second data storage for storing said processed data output by said first processor corresponding to said plurality of said determined time periods; and a second processor for computing a blood analyte related value of the test subject based on said processed data stored in said second data storage.