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System for plotting a miniature ECG

  • US 4,509,530 A
  • Filed: 12/27/1983
  • Issued: 04/09/1985
  • Est. Priority Date: 12/27/1983
  • Status: Expired due to Term
First Claim
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1. A method of printing an analog waveform having a time variable comprising the steps of:

  • converting said analog waveform into a time sequence of digitally expressed values;

    forming predetermined groups of said digital data and determining maximum and minimum amplitude values of said digital data within said groups;

    serially storing said maximum and minimum values;

    moving a recording medium past a transversely oriented linear array of discrete recording elements; and

    reading out in parallel in accordance with said serial stored values to said recording elements and actuating respective elements in parallel by said stored values at initial times and for time durations for each element that is a function of the stored maximum and minimum amplitude values for that element, wherein said waveform is recorded as a series of appropriately placed short parallel longitudinal lines to form in aggregate a transverse waveform display on said recording medium.

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