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Method and apparatus for coupling a moving-object sensor to direction-sensitive data utilization apparatus

  • US 4,079,323 A
  • Filed: 11/22/1976
  • Issued: 03/14/1978
  • Est. Priority Date: 11/22/1976
  • Status: Expired due to Term
First Claim
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1. An interface logic circuit for coupling a moving-object sensor to a data utilization apparatus requiring direction of passage data, employing a sensor of the kind which generates a left-end recognition signal EL indicative of intrusion of an object into a space at the left end of the sensor, a center recognition signal EC indicative of intrusion of an object into a space at the center of the sensor, and a right-end recognition signal ER indicative of intrusion of an object into a space at the right end of the sensor, comprising:

  • left-to-right logic means for generating a left-to-right object passage signal R only in response to occurrence of the three recognition signals in the sequence EL,EC,ER;

    right-to-left logic means for generating a right-to-left object passage signal L only in response to occurrence of the three recognition signals in the sequence ER,EC,EL;

    the two logic means including center signal storage means, common to both logic means, for storing the center recognition signal EC;

    and clearing means for clearing the center signal storage means in response to a change of state of either of the end recognition signals EL and ER after termination of the center recognition signal EC.

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