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CODE 39 Candidate Select Technique Disclosure Number: IPCOM000040009D
Original Publication Date: 1987-Sep-01
Included in the Prior Art Database: 2005-Feb-01

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Broockman, EC Cato, RT Laurer, GJ [+details]


This article describes a technique for locating a CODE 39 label candidate within a stream of data. A reversible counter counts up on bars and down on spaces for one character and then down on bars and up on spaces for the succeeding character. After an even number of characters, the residual count should approach 0 for a CODE 39 label. Referring to Fig. 1A, two successive CODE 39 characters are shown. Each character has five bars and four spaces. The bars and spaces can be of only two possible widths, wide or narrow. In each character, there are two wide bars and one wide space. The ratio of wide to narrow is fixed, at least nominally. Fig. 1B shows the count which accumulates in the counter which counts in one direction for a bar and then in the opposite direction for a space.