Digitizer for a bar code reader utilizing a first derivative sig

Details Digitizer for a bar code reader utilizing a first derivative sig Digitizer for a bar code reader utilizing a first derivative sig

1995-06-05

1997-04-08

Hajec, Donald T.

Registers

Coded record sensors

Particular sensor structure

235463, G06K 710

Patent

active

056190280

ABSTRACT:
A system for digitizing an analog electric signal generated from the photoelectronic conversion of reflected light when scanning indicia having spatially-separated, light-reflective portions, the system including a differentiator circuit for generating a first derivative signal representing a first derivative of the analog signal. An analog ground comparison circuit compares the first derivative signal and an analog ground comparison signal to generate an output signal indicating a change in the intensity of the reflected light. An output circuit generates a digital output signal corresponding to the digital signal.

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