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Signal averaging of cardiac electrical signals using temporal data compression and scanning correlation

  • US 5,255,186 A
  • Filed: 08/06/1991
  • Issued: 10/19/1993
  • Est. Priority Date: 08/06/1991
  • Status: Expired due to Term
First Claim
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1. A method of aligning cardiac electrical signal waveforms from a patient'"'"'s heart to facilitate signal averaging, comprising the steps of:

  • sensing and sampling cardiac electrical signals and, in response thereto, determining a heart rate for identifying the patient'"'"'s cardiac state;

    when the patient'"'"'s heart is functioning in a known cardiac state, storing a time sequence of template samples, temporally compressing said time sequence of template samples, and storing a time sequence of said temporally compressed template samples;

    monitoring subsequent cardiac electrical signals by storing a time sequence of cardiac signal samples, temporally compressing said time sequence of cardiac signal samples, and storing a time sequence of temporally compressed cardiac signal samples;

    determining a coarse alignment timing marker for a cardiac cycle of said subsequent cardiac electrical signals by mutually scan correlating said temporally compressed cardiac signal samples with said temporally compressed template samples, and by comparing resulting correlation coefficients to locate a maximum correlation coefficient indicative of signal alignment of said compressed template with said compressed cardiac signal; and

    determining a fine alignment timing marker for said cardiac cycle of subsequent cardiac electrical signals by mutually scan correlating those of said noncompressed cardiac signal samples which are closely adjacent to samples which correspond to the maximum correlation coefficient with those of said noncompressed template samples which are closely adjacent to samples which correspond to the maximum correlation coefficient, and by comparing resulting correlation coefficients to locate a maximum correlation coefficient indicative of signal alignment of said noncompressed template with said noncompressed cardiac signal.

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