Encoder and constructed answer system for television

Details Encoder and constructed answer system for television Encoder and constructed answer system for television

1975-06-27

1977-08-23

Griffin, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

340356, 358147, H04N 708

Patent

active

040443809

ABSTRACT:
In an educational television system, a constructed answer system is based on the use of code pulses that are repeated cyclically during their concealed transmission within a television video waveform. Indicia, e.g., letters of a word or formula, are preloaded into a store in the form of binary code as an output from a punched tape reader or an encoder for a keyboard. The encoder is reset following each transfer of encoded indicia to the store which is indexed by a shift register to render responsive successive columns of flip-flops in a matrixed arrangement. The store includes a column of AND gates to store a permanent "recycle code". The reading of the store is clocked by modified sync pulses applied by a shift register to a matrix arrangement of interconnected AND gates that are also connected to the output of the flip-flops. The readout of the store is repeated cyclically by a logic register that compares the number of encoded indicia in the store with the number of encoded indicia read from the store. Further circuitry, using AND gates, is responsive to a student keyboard to compare the student response with the decoded indicia signals to determine a correct response.

REFERENCES:
patent: 3510777 (1970-05-01), Gordon
patent: 3529081 (1970-09-01), Rider
patent: 3606688 (1971-09-01), Zawels et al.
patent: 3932698 (1976-01-01), Yanagimachi et al.
patent: 3991265 (1976-11-01), Fukuda et al.
Featherston and Luper, "Interactive Instructional System," IBM Tech. Disclosure Bulletin, vol. 14, No. 10, pp. 3125-3126, March 1972.

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