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A self-clocking bar code employs a segment fill-in technique which expands the acceptable code combinations without expanding the number of bars defining the code.
English (United States)
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Self Clocking Bar Code
A self-clocking bar code employs a segment fill-in technique which expands
the acceptable code combinations without expanding the number of bars defining
The self-clocking bar code includes a requisite character code 11 (Fig. 1) in
either upper track A or lower track B or in both tracks at each code position to
insure a self-clocking code. When utilizing four code positions, a maximum of 81
acceptable combinations may be defined. In order to expand the number of
acceptable code combinations, two adjacent single bars may be combined into
one double bar providing that two single bars are located opposite the double bar
to insure the self-clocking mode. The sensing of the double bar provides a
double bar valid signal which can then be used in conjunction with the bar code
to provide an additional level of coding.
With reference to Fig. 2, a non-return to zero (NRZ) coding scheme may be
employed utilizing the double code bar technique. This scheme requires that
there be at least one transition at each data point and that codes return to zero at
the end of the character in order to insure bidirectional scanning capability.
Unlike the two-by-four bar code of Fig. 1, only five horizontal segment positions
per character are required to enable a minimum of 96 acceptable combinations.
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