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Bidirectional Object Location Circuitry

IP.com Disclosure Number: IPCOM000079745D
Original Publication Date: 1973-Aug-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Hirschman, JA: AUTHOR

Abstract

This logical circuitry determines the direction of movement of an object and its location with respect to a predetermined reference object, without dropping a count on change of direction.

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Bidirectional Object Location Circuitry

This logical circuitry determines the direction of movement of an object and its location with respect to a predetermined reference object, without dropping a count on change of direction.

A magnetic tape 10 having spaced areas of one polarity is used as an example only of moving objects. Two electromagnetic transducers 12 and 14 are spaced 90 degrees out of phase along the tape 10. The transducers 12 and 14 are connected to level translating circuits 16 and 18, respectively.

Forward motion is defined by the level of translating circuit 16 rising before that of translating circuit 18. A bistable flip-flop circuit 20 is arranged to be set for indicating forward motion and reset for reverse motion.

The level translating circuit 16 is connected to monostable flip-flops 21 and 22 and the other translating circuit 18 is connected to monostable flip-flops 23 and 24. These monostable circuits preferably have as short a stable period as possible, but long enough to set or reset the bistable flip-flop 20 and trigger an up-down counter 30. The monostable circuits 21 and 23 are triggered on the rising edge of a level change and the others are triggered by the falling edge. Four AND gating circuits 31 . . . 34 are connected to follow the logic, and two OR gating circuits 41 and 42 couple the outputs of the AND gating circuits to the "up" and to the "down" input terminals of the counter 30.

With the level of the translating circuit 16 up and the...