Signal processing apparatus
AssigneeMasimo Corporation
InventorsMohamed K. Diab, Esmaiel Kiani-Azarbayjany, Ibrahim M. Elfadel, Rex J. McCarthy, Walter M. Weber, Robert A. Smith
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Abstract
The present invention involves a method and an apparatus for analyzing measured signals, including the determination of a measurement of correlation in the measured signals during a calculation of a physiological parameter of a monitored patient. Use of this invention is described in particular detail with respect to blood oximetry measurements.
Claims17
A method of reducing an effect of unwanted signal portions from one or more signals usable to determine a physiological characteristic of pulsing blood, the method comprising:
- receiving first and second intensity signals from light-sensitive detector which detects light of at least first and second wavelengths attenuated by body tissue carrying pulsing blood, wherein the first and second intensity signals each include wanted and unwanted signal portions;
- shaping at least some of the unwanted signal portions away from wanted frequencies;
- removing at least some of the shaped unwanted signal portions;
- and
- calculating a physiological characteristic of the pulsing blood from at least one of the wanted signal portions of the first and second intensity signals.
A physiological monitor which uses a noise shaping converter to remove unwanted portions of signals usable to determine one or more physiological characteristics, the physiological monitor comprising:
- at least one conductive element which receives first and second intensity signals from light-sensitive detector which detects light of at least first and second wavelengths attenuated by body tissue carrying pulsing blood, wherein the first and second intensity signals each include wanted and unwanted signal portions;
- a noise shaping converter which shapes at least some of the unwanted signal portions away from unwanted frequencies;
- means for removing at least some of the shifted unwanted signal portions;
- and
- means for calculating a physiological characteristic of the pulsing blood from at least one of the wanted signal portions of the first and second intensity signals.
Dependencies are inferred from the claim text.