Teaching system employing binary light-sensitive responders

Details Teaching system employing binary light-sensitive responders Teaching system employing binary light-sensitive responders

1978-01-27

1980-06-10

Grieb, William H.

G09B 7073

Patent

active

042065577

ABSTRACT:
In a teaching system, a television screen displays a question calling for one of four possible answers, together with one or a pair of dots of light at locations illuminated in a binary pattern indicating the correct answer. Optical sensors detachably secured to the television receiver screen at the locations and concealing the same from view feed a pair of binary signals to a logic decoder. The decoder provides an output signal over one of four output lines to a number of student-actuated responder units, each of which includes four switches for selecting an answer and a lamp that is illuminated to indicate the selection of a correct answer. In an alternative embodiment, each responder unit is disabled after the switches are first actuated to select an answer and is re-enabled only after receiving a reset signal from an additional optically sensed screen dot at the beginning of the next response period.

REFERENCES:
patent: 2564089 (1951-08-01), Williams et al.
patent: 3077038 (1963-02-01), Williams et al.
patent: 3095653 (1963-07-01), Corrigan
patent: 3777410 (1973-12-01), Robinson
patent: 3784979 (1974-01-01), Friedman et al.
patent: 3848082 (1974-11-01), Summers

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