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Signal processing apparatus and method

  • US 6,501,975 B2
  • Filed: 01/09/2001
  • Issued: 12/31/2002
  • Est. Priority Date: 03/07/1991
  • Status: Expired due to Fees
First Claim
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1. A pulse oximeter comprising:

  • at least first and second light emitting devices;

    at least one light detector configured to receive light attenuated by transmission through a body tissue with pulsing blood, the at least one light detector acquiring a first signal based on light from the first light emitting device comprising a first desired signal portion and a first undesired signal portion and a second signal based on light from the second light emitting device comprising a second desired signal portion and a second undesired signal portion; and

    a closed loop adaptive system responsive to said first and second signals to provide at least first and second output signals for use in calculating oxygen saturation of said blood.

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