Method and apparatus for bar code data autodiscrimination
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United States of America Patent
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-
Nov 1, 1988
Grant Date -
N/A
app pub date -
Sep 29, 1986
filing date -
Sep 29, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An improved method and apparatus for the autodiscrimination of barcodes is described. First, an interrupt driven technique for timing the duration of space and bar barcode data is described which allows a microprocessor to decode a first quantum of barcode data during a substantial portion of the time the microprocessor is timing the duration of space and bar data of a second quantum of barcode data. Second, an improved method of locating a barcode margin and eliminating types of barcode to be tried for purposes of decoding is described. Briefly, an integer ratio of space and following bar duration data is compared to a predetermined number, and a determination is made as to whether the space is a margin based on the comparison. Preferably, the two techniques are used in conjunction to speed the autodiscrimination in apparatus for scanning a plurality of different types of bar codes.
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