Group response and indication system

Details Group response and indication system Group response and indication system

1975-05-19

1978-03-14

Trafton, David L.

Communications: electrical

Systems

Call station

35 48R, 340150, G08B 108

Patent

active

040793656

ABSTRACT:
A system is provided whereby each person in a group is provided with a response unit comprising push buttons to indicate a response or answer selected from a plurality of possible answers to a question from an interrogater. A memory and indicator unit is provided to store and indicate the responses. The response units are connected in parallel to the memory unit through a unitary transmission line. The response units also comprise indicator light units to indicate the respective responses as stored in the memory unit, all of the indicator light units being connected in parallel to the memory unit through a unitary response line which may be integral with the transmission line. Scanning means sequentially scan the push buttons of the respective response units, the memory units and the indicator light units of the response units in synchronism. An absentee memory unit is also provided to indicate unused response units.

REFERENCES:
patent: 2738595 (1956-03-01), John et al.
patent: 3118236 (1964-01-01), Hemel
patent: 3647926 (1972-03-01), Rohloff et al.
patent: 3784979 (1974-01-01), Friedman et al.

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