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Method and apparatus for estimating physiological parameters using model-based adaptive filtering

  • US 5,853,364 A
  • Filed: 06/07/1996
  • Issued: 12/29/1998
  • Est. Priority Date: 08/07/1995
  • Status: Expired due to Term
First Claim
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1. A method for reducing noise effects in a system for measuring a physiological parameter comprising the steps of:

  • generating a plurality of measurements derived from at least one wavelength of electromagnetic energy transmitted through living tissue;

    comparing selected measurements with at least one expected measurement characteristic,assigning one of a plurality of variable weights to each selected measurement based-on the comparing step, thereby generating a plurality of weighted measurements;

    assigning the plurality of variable weights in part, in response to a similarity between each selected measurement and a corresponding previous measurements;

    averaging the plurality of weighted measurements to obtain a filtered measurement for use in estimating the physiological parameter; and

    selectively adjusting at least one step in the averaging and assigning steps, the adjusting step based on knowledge, derived independently of the plurality of measurements in the generating step, of at least one characteristics of the physiological parameter.

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