Teaching System Employing Binary Light-sensitive Responders (Expired)
- Author(s):
- Swinton, Spencer S.
- Patent Issued:
- Jun 10, 1980
- Patent Number:
- 4,206,557
- Source:
- ETS Patent
- Document Type:
- Patent
- Family ID:
- 25360350
- Subject/Key Words:
- Patent, Expired Patent, Teaching System, Binary Scoring, Optical Scanning and Mark Sensing, Television, Student Responses, Multiple Choice Items
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.