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Procedure and device for the detection of extraordinary events in a series of essentially periodically recurring normal events

  • US 4,231,374 A
  • Filed: 10/23/1978
  • Issued: 11/04/1980
  • Est. Priority Date: 11/07/1977
  • Status: Expired due to Term
First Claim
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1. Procedure for the detection of extraordinary events in a series of essentially periodically recurring normal events, particularly extra systoles in the EKG, said procedure comprising:

  • manually setting a control (1) to a selected fixed value representing a time period corresponding to a fixed monitoring interval between successive occurrences of a normal event,in a first mode of operation responding to each occurrence of the normal event to begin scanning for a further event, and continuing such scanning for a fixed time duration which corresponds to said selected fixed value, and so monitoring for a further event after each normal event directly according to said selected fixed value so long as the first mode of operation continues, shifting over from said first mode of operation to a second mode of operation, and during said second mode of operation;

    (a) activating a comparator circuit (17, 18,

         28) with the compartor having a first input (29) receiving a signal in accordance with said selected fixed value from the control (1) and having a second input (27) connected with a voltage regulator (22,

         23),(b) monitoring the actual repetition rate of currently occurring normal events by means of a frequency to voltage converter (24),(c) supplying the output of the frequency to voltage converter (24) to said voltage regulator (22,

         23) with the output of the voltage regulator being connected to the second input (27) of he comparator circuit (17, 18,

         28),(d) step by step adjusting the amplification factor of the voltage regulator (22,

         23) until the output therefrom as supplied to the second input (27) of the comparator circuit matches the signal at the first input (29) thereof,(e) responding to the matching at the first and second inputs of the comparator circuit (17, 18,

         28) to fix the amplification factor at the currently adjusted value, and(f) thereafter during said second mode of operation supplying the output of the voltage regulator (22,

         23) with the amplification factor thereof adjusted according to steps (d) and (e) as a control value representing the time duration of a concomitantly variable monitoring interval, and thereafter responding to each occurrence of the normal event to begin scanning for an extraordinary event, and continuing such scanning for a time duration which is a function of said control value during said second mode of operation.

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