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Method and apparatus for evaluating rhythmic oscillations in aperiodic physiological response systems

  • US 4,510,944 A
  • Filed: 12/30/1982
  • Issued: 04/16/1985
  • Est. Priority Date: 12/30/1982
  • Status: Expired due to Term
First Claim
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1. A system for detecting amplitude variations in the rhythmic oscillations of heart period in a predetermined frequency band of interest, comprising:

  • sensor means for detecting an occurrence of an event in the cycle of a heartbeat;

    timing means for determining time intervals between the occurrence of said event in successive heartbeats;

    buffer means for storing said time intervals between the occurrence of said event in successive heartbeats;

    means for reading out said intervals stored in said buffer means at predetermined time intervals;

    first filter means responsive to the intervals read out from said buffer means, including a means for determining an aperiodic portion of said intervals read out from said buffer means and a subtraction means for subtracting said aperiodic portion from said intervals read out from said buffer means and for producing a corresponding output;

    second filter means for receiving and filtering the output of said first filter means and for outputting a signal in a band-pass region determined by said predetermined frequency band of interest; and

    output means for calculating the variance of rhythmic oscillations in the signal outputted by said second filter means.

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