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  • US 4,635,215 A
  • Filed: 09/10/1984
  • Issued: 01/06/1987
  • Est. Priority Date: 09/10/1984
  • Status: Expired due to Term
First Claim
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1. A signal processor for processing a signal of an article sensor which generates a variable signal which has a relationship to the quantity of articles within the sensor, the signal processor comprising:

  • means for generating an offset value representing a steady state magnitude of the variable signal produced by the article sensor when no articles are in transit through the article sensor;

    means for deriving a first value by subtracting an input value from the offset value, wherein the input value represents an actual magnitude of the variable signal;

    means for deriving an area value by repetitively integrating the first value; and

    means for comparing the area value to an estimated area value and for generating an output signal when the area value is not less than the estimated area value.

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