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Electrocardiogram enhancement system and method

  • US 4,862,897 A
  • Filed: 12/31/1986
  • Issued: 09/05/1989
  • Est. Priority Date: 11/05/1985
  • Status: Expired due to Fees
First Claim
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1. A method for enhancing an electrocardiogram signal having frequency, low amplitude notches that are difficult to visually detect within an electrocardiogram signal waveform and that have frequencies above the signal recording bandwidth of a conventional chart recorder, said signal having a plurality of frequency components, each frequency component having a frequency, phase and amplitude, the frequencies of the frequency components comprising a first inter-component frequency relationship and the phases of the frequency components comprising a first inter-component phase relationship said enhancement method comprising the steps of:

  • selectively amplifying frequency components representing the notches relative to other frequency components in the electrocardiogram signal; and

    expanding said electrocardiogram signal including the amplified frequency components in time scale by a time scale expansion factor, frequency components representing said expanded signal having a second intercomponent frequency relationship and a second inter-component phase relationship equivalent to said first inter-component frequency relationship and first inter-component phase relationship, said expanded signal having a frequency range within the bandwidth of a conventional chart recorder.

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