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Digital loop detector system

  • US 3,868,626 A
  • Filed: 07/09/1973
  • Issued: 02/25/1975
  • Est. Priority Date: 07/09/1973
  • Status: Expired due to Term
First Claim
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1. A digital detecting system for generating an output signal when an electrically conductive mass comes within the field of effect of a loop, said system comprising:

  • means for creating a pulse train, the number of pulses in said train being controlled primarily by the presence of said mass in the field of effect of said loop;

    means for generating a first signal representative of the average of the number of pulses in said pulse train;

    means for generating a second signal representative of a reference count;

    means for comparing said first and second signals; and

    , means for creating an output signal when said first signal differs from said second signal.

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