Communications: electrical – Digital comparator systems
Patent
1971-11-16
1977-03-15
Boudreau, Leo H.
Communications: electrical
Digital comparator systems
235 6111E, G06K 918
Patent
active
040127168
ABSTRACT:
A machine-readable record or label includes alternating areas of different reflectivity providing a binary coded data record. The record is made by selecting the widths of the areas such that an increase in the relative widths of any two consecutive areas of like characteristics represents a binary "1" and a decrease in the relative widths of any two consecutive like areas represents a binary "0". Thus, each area in a part of the code is used in the establishment of the values of two different binary bits. A method of and system for reading or interpreting the record or label includes two pairs of light reader controlled registers in one pair of which bar widths are stored and in the other pair of which space widths are stored. In each pair, the widths of consecutive like areas are alternately stored. A sequence control steers successive width signals from the reader into a proper register in a proper register pair. A comparator coupled to the registers and the sequence control determines whether each newly stored width is greater than or less than the width of the previously stored area and stores a 1 or a 0 in a shift register.
REFERENCES:
patent: 3225177 (1965-12-01), Stites
patent: 3543007 (1970-11-01), Brinker
patent: 3622758 (1971-11-01), Schanne
patent: 3671722 (1972-06-01), Christie
patent: 3674990 (1972-07-01), Kurauchi
patent: 3701886 (1972-10-01), Jones
patent: 3708748 (1973-01-01), Nassimbene
patent: 3716699 (1973-02-01), Eckert
patent: 3723710 (1973-03-01), Crouse
patent: 3805175 (1974-04-01), Nassimbene
Boudreau Leo H.
Monarch Marking Systems, Inc.
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