Signal processing apparatus

  • US 8,463,349 B2
  • Filed: 05/03/2012
  • Issued: 06/11/2013
  • Est. Priority Date: 10/07/1994
  • Status: Expired due to Fees
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First Claim
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1. A patient monitoring system configured to determine one or more physiological characteristics of a patient, the system comprising:

  • a plurality of light emitters configured to emit light of at least two different wavelengths into tissue of a patient;

    a detector configured to detect the emitted light after attenuation by the tissue and output a signal indicative of the detected light; and

    a processing system configured to receive and process the detected signal and determine information indicative of oxygen saturation, pulse rate and respiration rate, the processing system configured to use at least a windowing function and a frequency domain calculation, wherein the processing system reduces an effect of motion noise.

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