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Apparatus for monitoring cardiac activity via ECG and heart sound signals

  • US 4,548,204 A
  • Filed: 02/23/1984
  • Issued: 10/22/1985
  • Est. Priority Date: 03/06/1981
  • Status: Expired due to Term
First Claim
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1. In apparatus for detecting heart sounds and analyzing ECG signals, the apparatus including a heart sound signal input and an ECG signal input, the combination of:

  • first means responsive to said ECG signal for modulating said ECG signal with a predetermined audio frequency to provide a modulated ECG signal;

    second means responsive to said modulated ECG signal and said heart sound signal input for combining said signals as a combined modulated ECG signal and heart sound signal output as a single combined signal; and

    receiving means responsive to said single combined signal for providing an ECG signal output and a heart sound signal output, said receiving means comprising third means for demodulating said single combined signal in accordance with said predetermined audio frequency to provide said ECG signal and fourth means for providing said heart sound signal, and fourth means comprising filtering means for passing low frequency signals associated with heart sounds and attenuating high frequency signals not associated with heart sounds.

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