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Signal processing apparatus

  • US 8,359,080 B2
  • Filed: 02/15/2012
  • Issued: 01/22/2013
  • Est. Priority Date: 10/07/1994
  • Status: Expired due to Fees
First Claim
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1. A non-invasive optical based physiological monitoring system configured to determine a plurality of physiological parameters, the monitoring system comprising:

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

    a detector configured to detect the light of the at least two different wavelengths after it has been attenuated by the patients tissue and produce an analog signal indicative of the detected light;

    a delta-sigma converter configured to convert the analog signal to a digital signal; and

    a processing system configured to receive the digital signal and to process the signal in order to determine a first signal component indicative of a first physiological parameter and a second signal component indicative of a second physiological parameter;

    wherein the first physiological parameter is oxygen saturation and the second physiological parameter is respiration rate.

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