Bar code signal digitizer adapted for signals from inverse bar c

Details Bar code signal digitizer adapted for signals from inverse bar c Bar code signal digitizer adapted for signals from inverse bar c

1994-03-18

1995-05-30

Hajec, Donald

Registers

Coded record sensors

Particular sensor structure

235472, 235455, G06K 710

Patent

active

054204100

ABSTRACT:
In order to prevent a digitizer which receives signals from a bar code reader which scans an inverse code (white bars on black background as opposed to a direct or normal code with black bars on white background) from improperly digitizing a white space as a black bar and also, if desired, to enable the digitizer to operate properly in digitizing signals from direct or inverse codes without switching the digitizer from direct to inverse digitizing mode by operator control, the digitizer is operated, automatically under computer control on different ones of a series of successive scans of the code, which are carried out until the code is successfully read, to provide an output, which is of different states when reading white sections and black sections of the code, and to be restored, respectively, to a state corresponding to the reading of a black section of the code and to a state corresponding to the reading of a white section of the code, when a direct code is to be digitized and when an inverse code is to be digitized. In effect, the output is prevented from being restored to a black representing state when a direct code is to be digitized and to a white representing state when an inverse code is to be digitized. In addition, the digitizer has circuitry for inverting the state of the digitized bar code output of the digitizer when inverse codes are digitized.

REFERENCES:
patent: 4656345 (1987-04-01), Kurimoto
patent: 5200597 (1993-04-01), Eastman et al.
patent: 5210397 (1993-05-01), Eastman
patent: 5227614 (1993-07-01), Danielson et al.

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