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Vorrichtung zur drahtlosen Erfassung der Reaktion einer Vielzahl von Personen

Device for the wireless detection of the reaction of several persons
 
: Heuberger, A.; Gloeckler, R.; Schott, H.; Seitzer, D.

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Frontpage ()

DE 1993-4321801 A: 19930630
DE 1993-4321801 A: 19930630
DE 4321801 C1: 19940714
G07C0013
Deutsch
Patent, Elektronische Publikation
Fraunhofer IIS A ( IIS) ()

Abstract
A device for the wireless detection of the reaction of several persons comprises an inquiry unit and a large number of terminals. The control electronic circuitry of each terminal permits the input of a code in a memory in the terminal and causes the terminal to switch over to a ready-to-send state only after detecting an inquiry signal from the inquiry unit, however not while a user is performing an input. Due to special inquiry signals or numeric values of an internal time base, the inquiry units whose stored codes correspond to the special inquiry signal send a a reply signal. By measuring the characteristic of all receive signals, the inquiry unit can determine the number of persons who entered a corresponding code.

: http://publica.fraunhofer.de/dokumente/PX-40861.html