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Data compression of ECG data using delta modulation

  • US 4,567,883 A
  • Filed: 06/09/1983
  • Issued: 02/04/1986
  • Est. Priority Date: 06/09/1983
  • Status: Expired due to Term
First Claim
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1. A data recorder for recording ECG input data from within the body of a patient, comprising:

  • implanted ECG input means for receiving an analog ECG waveform from the heart of the patient;

    implanted data conversion means for converting the analog ECG waveform by delta modulation into a digital pulse train which constitutes the ECG input data;

    implanted memory means for storing the digital pulse train;

    implanted transmission means for selectively transmitting the digital pulse train from the memory means across the skin of the patient to a location externally of the body of the patient, said transmission means including a piezoelectric transducer means for converting said digital pulse train into a variable audible signal for transmission across the skin of the patient to be detected externally of the body, said audible signal being representative of the originally received analog ECG waveform and varying in accordance with the characteristics of the previously stored digital pulse train.

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