Apparatus for interpreting Code 39 bar code data

Details Apparatus for interpreting Code 39 bar code data Apparatus for interpreting Code 39 bar code data

1981-05-26

1983-04-05

Pitts, Harold I.

Registers

Coded record sensors

Particular sensor structure

235462, 235472, G06K 710

Patent

active

043792243

ABSTRACT:
An apparatus for interpreting digital output signals from a Code 39 bar code data system wherein all of the bars and spaces in a signal code character are measured for time duration, minimum and maximum widths bars and spaces are identified, first bar cutoff and space cutoff values are respectively produced having a time duration approximately 1.5 times the time duration of the minimum width bar and space, second bar cutoff and space cutoff values are respectively produced having a time duration approximately equal to one-half of the sum of the time duration of the minimum and maximum width bars and spaces and means are provided for respectively comparing the first and second bar cutoff values and space cutoff values and for using the greater of such values as a reference against which all of the bars and spaces in said characters are respectively measured. The identification is made on the basis of the bars and spaces respectively having a time duration greater than that of the corresponding bar cutoff value or space cutoff value being interpreted as wide bars and spaces and those bars and spaces having a time duration less than that of the corresponding bar cutoff value or space cutoff value being interpreted as narrow bars and spaces respectively.

REFERENCES:
patent: 4140271 (1979-02-01), Nojiri

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