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Respiratory rate measurement using a combination of respiration signals

  • US 9,872,634 B2
  • Filed: 02/08/2013
  • Issued: 01/23/2018
  • Est. Priority Date: 02/08/2013
  • Status: Active Grant
First Claim
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1. A system for determining respiratory rates of a user, the system comprising:

  • at least one electrode adapted to be coupled to the user, wherein the at least one electrode measures at least one respiration signal,wherein to measure at least one respiration signal is to measure a plurality of respiration signals to determine a plurality of respiration rates (RR1 . . . N), wherein the application further causes the processor to;

    determine a quality metric (Q1 . . . N) for each of the plurality of respiration rates; and

    combine the plurality of respiration rates by weighting the quality metric for each of the plurality of respiration rates based on a quality process to calculate a weighted respiration rate (RRweighted);

    a processor coupled to the at least one electrode; and

    a memory device coupled to the processor, wherein the memory device stores an application which, when executed by the processor, causes the processor to;

    filter the at least one respiration signal measured by the at least one electrode using a lowpass filter;

    peak-pick the filtered respiration signal to determine a respiratory rate by using a standard deviation of the filtered respiration signal over a changing threshold; and

    determine a quality metric of the respiratory rate by using previously learned weights of features of the respiratory rate, wherein the features of the respiratory rate include a coefficient of variation of a difference in minima times (ct), a coefficient of variation of peak-to-peak values (cp), a mean peak-to-peak value (mp), and a ratio of a number of picked extrema to a total number of all local extrema (rext).

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