Bar code reader and decoder

Details Bar code reader and decoder Bar code reader and decoder

1975-12-05

1977-11-15

Thesz, Joseph M.

Registers

Platform operated

Platform actuated traffic counters

235 92MB, 235 92PE, 235 92DE, 235 92R, H03K 2136

Patent

active

040587088

ABSTRACT:
A bar code reader and decoder for reading and decoding linear bar coded information through the use of a logarithmic time base generator. The ratio of the widths of the coding segments are computed for decoding the bar coded data by utilizing a logarithmic time base generator for providing a logarithmic measure of the widths of preselected coding segments and accumulating the logarithmic timing signals in up/down counters to provide a logarithmic representation of the ratios of the widths of the segments. The resultant count of an up/down counter is applied to a translation table to provide a signal representative of equality in widths between compared coding segments or the relative widths in terms of greater than or less than in the direction of scanning.

REFERENCES:
patent: 3581066 (1971-05-01), Maure et al.
patent: 3808407 (1974-04-01), Ratz
patent: 3824378 (1974-07-01), Johnson et al.
patent: 3835297 (1974-09-01), Inove
patent: 3849632 (1974-11-01), Eckert
patent: 3866024 (1975-02-01), Williams

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