Data retrieval and error detection circuitry for a...

Details Data retrieval and error detection circuitry for a... Data retrieval and error detection circuitry for a...

G - Physics

06

K

354/56

G06K 7/10 (2006.01) G08C 9/06 (1980.01)

Patent

CA 1054716

IMPROVED DATA RETRIEVAL AND ERROR DETECTION CIRCUITRY FOR A WIDTH-MODULATED BAR-CODE SCANNING APPARATUS Abstract of the Disclosure An apparatus for processing the signals that are generated when a width-modulated bar code is manually scanned includes a simplified serial arithmetic unit and an error- detection circuit which detects errors in scanning tech- nique as well as parity errors and the like. Substantially less expensive to construct than prior arrangements, the apparatus is able to measure the spacing between adjacent bar-coded characters and reject any data if the character spacing is greater or less than is proper at any given point in a data scan. It thus becomes difficult for an erroneous scan to result when a scanning motion reverses itself, begins in the middle of a bar code, or extends over two independent bar codes.

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