Bar code detecting circuitry

Details Bar code detecting circuitry Bar code detecting circuitry

1995-05-18

1996-08-20

Pitts, Harold

Registers

Coded record sensors

Particular sensor structure

235463, G06K 710

Patent

active

055481094

ABSTRACT:
A wide bandwidth slope detector has a comparator with first and second time constant circuits coupled to first and second inputs thereof. Where one time constant is on the order of three times the other, the comparator will change state in response to the slopes of an input analog signal coupled to the time constant circuit. Feedback can be provided by a fixed resistor or by a tracking circuit. A smoothing or clipping circuit can be used to pre-process the input analog signals to eliminate noise therefrom. A bar code reading system combines first and second clipping circuits to smooth the highs and lows of the input signal, coupled to a slope detector. The tracking circuit can be used to provide a symmetrical hysteresis characteristic.

REFERENCES:
patent: 3751636 (1973-08-01), Coles, Jr.
patent: 4101072 (1978-07-01), Weaver
patent: 4219152 (1980-08-01), Couch et al.
patent: 5159340 (1992-10-01), Smith

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