Apparatus utilizing analog-to-digital conversion in the photoele

Details Apparatus utilizing analog-to-digital conversion in the photoele Apparatus utilizing analog-to-digital conversion in the photoele

1972-07-03

1976-09-28

Sloyan, Thomas J.

Registers

Calculators

Input-output calculator to indicator, printer, etc.

35 48B, 235 6111E, G06K 500

Patent

active

039833640

ABSTRACT:
An examination answer sheet, on which the examinee has darkened certain discrete areas with a graphite or lead pencil to denote his selected answers to multiple choice questions, is moved relative to a plurality of photoelectric cells, these cells providing analog voltages having magnitudes in accordance with the opacity of the marks or data on the sheet. During time intervals derived photoelectrically from a sequence of marks constituting a timing track, the highest voltages provided by the data cells are individually stored, later digitized, and the digital information forwarded to a computer for comparative processing with answer information contained in the computer's memory.

REFERENCES:
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patent: 3487560 (1970-01-01), Hassfurther et al.
patent: 3495235 (1970-02-01), Ottesen
patent: 3524048 (1970-08-01), McMillin
patent: 3536895 (1970-10-01), Dedden et al.
patent: 3603975 (1971-09-01), Gordon
patent: 3629496 (1971-12-01), McConnell
patent: 3692982 (1972-09-01), McMillin
patent: 3718910 (1973-02-01), Scray et al.
patent: 3737628 (1973-06-01), Azure

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