초록 ▼

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 logarit

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.

대표청구항 ▼

A digital-logarithmic timing signal generator for generating successive digital timing signals that are logarithmically relaTed comprising a binary counter for counting down preselected numbers preset into the counter and providing output signals therefrom at the same preselected count thereby gener

A digital-logarithmic timing signal generator for generating successive digital timing signals that are logarithmically relaTed comprising a binary counter for counting down preselected numbers preset into the counter and providing output signals therefrom at the same preselected count thereby generating the successively logarithmically related digital timing signals, means coupled to the binary counter for responding to the output signals therefrom to enter a succession of preselected logarithmically related numbers into the binary counter, the preselected numbers being selected on the basis of any predetermined logarithmic base, other than the base two, so that the successive output signals and thereby the timing signals are logarithmically time related, and a pulse source coupled to the binary counter for counting down the binary counter to the preselected count, the pulses from said source being selected to occur at a continuous preselected rate.