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Method for reducing ambient noise effects in electronic monitoring instruments

  • US 5,368,224 A
  • Filed: 10/23/1992
  • Issued: 11/29/1994
  • Est. Priority Date: 10/23/1992
  • Status: Expired due to Term
First Claim
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1. A method for adapting to noise in a signal obtained with an active signal sensing monitor having a demultiplexer, said demultiplexer selecting between two signals at a demultiplexer frequency, the method comprising:

  • (a) determining a noise level at a first selected demultiplexer frequency;

    (b) determining noise levels at one or more other selected demultiplexer frequencies;

    (c) comparing the noise levels of the first and other demultiplexer frequencies;

    (d) selecting an optimum demultiplexer frequency having a comparatively low noise level from among the first and one or more other demultiplexer frequencies; and

    (e) operating the active signal sensing monitor at said optimum demultiplexer frequency.

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