Method and apparatus for coupling a moving-object sensor to direction-sensitive data utilization apparatus
First Claim
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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Abstract
An interface logic circuit for supplying direction of passage data to a data utilization apparatus from a moving-object sensor which generates three recognition signals indicative of intrusion of an object into the left end, center, and right end, respectively, of a sensing space adjacent the sensor, comprising directional logic means for generating left-to-right and right-to-left object passage signals in response to the recognition signal sequences left-center-right and right-center-left, respectively, independently of overlap between the recognition signals or duration of the individual signals, and inhibit logic means for inhibiting generation of both object passage signals for all other recognition signal occurrence sequences.
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Citations
9 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of generating directional object passage signals for control of a data utilization apparatus, employing the output from a moving-object 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, all of the recognition signals being of variable duration, comprising:
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generating a left-to-right object passage pulse signal R in response to occurrence of the three recognition signals in the sequence EL, EC, Er, independently of duration of the individual recognition signals and independently of any overlap between the signal EC and either of the signals EL and ER; generating a right-to-left object passage pulse signal L in response to occurrence of the three recognition signals in the sequence ER,EC,EL, independently of duration of the individual recognition signals and independently of any overlap between the signal EC and either of the signals EL and ER; and inhibiting generation of both object passage signals for all other sequences of occurrence of the recognition signals by storing the center recognition signal EC, in preparation or generation of a passage pulse signal, and clearing the stored center recognition signal upon initiation of either of the end recognition signals ER and EL following termination of the center recognition signal EC.
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Specification