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Method and device for noise detection in physiological signals

  • US 9,026,198 B2
  • Filed: 06/08/2011
  • Issued: 05/05/2015
  • Est. Priority Date: 07/13/2010
  • Status: Active Grant
First Claim
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1. A method for determination of noise in a sampled physiological signal, the sampled physiological signal including a consecutive sequence of samples, each sample having a signal amplitude, the method including the steps of:

  • a. providing a signal quality check window that includes a number of consecutive samples;

    b. providing an upper noise threshold and a lower noise threshold, wherein the upper noise threshold and the lower noise threshold define at least three amplitude ranges;

    (1) a high range for signal amplitudes exceeding the upper noise threshold,(2) a medium range for signal amplitudes between the upper noise threshold and the lower noise threshold, and(3) a low range for signal amplitudes below the lower noise threshold;

    c. comparing each sample within the quality check window with the upper noise threshold and with the lower noise threshold;

    d. determining any changes between amplitude ranges between each two adjacent sample pairs within the quality check window;

    e. determining a supra-threshold sample sum corresponding to the number of samples outside the medium range; and

    f. generating a low signal quality indication signal if the supra-threshold sample sum exceeds a predefined threshold.

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