Circuit for processing analog signal obtained by scanning bar co

Details Circuit for processing analog signal obtained by scanning bar co Circuit for processing analog signal obtained by scanning bar co

1990-05-30

1991-10-29

Pitts, Harold

Registers

Coded record sensors

Particular sensor structure

235463, 235472, G06K 710

Patent

active

050618431

ABSTRACT:
A circuit for processing an analog electric signal which is obtained from a photoelectric transformation of a reflected light when scanning a bar code by a light beam. The circuit includes a differentiating circuit for differentiating the analog electric signal, a delay circuit for delaying the output of the differentiating circuit; a first gate signal generating circuit for generating a first gate signal which is active when the level of the output of the differentiating circuit is higher than a positive threshold, a second gate signal generating circuit for generating a second gate signal which is active when the level of the output of the differentiating circuit is lower than a negative threshold, and a comparing circuit for comparing the output of the differentiating circuit with the output of the delay circuit. The output of the comparing circuit being one binary level when the level of the output of the differentiating circuit is higher than the level of the output of the delay circuit, and the output of the comparing circuit is the opposite binary level when the level of the output of the differentiating circuit is lower than the level of the output of the delay circuit. A first gate circuit for detecting transition points in the output of the comparing circuit when the first gate signal is active, and a second gate circuit for detecting transition points in the output of the comparing circuit when the second gate signal is active, are also provided.

REFERENCES:
patent: 3716699 (1973-02-01), Eckert, Jr. et al.
patent: 4000397 (1976-12-01), Hebert et al.
patent: 4219152 (1980-08-01), Couch et al.
patent: 4246473 (1981-01-01), Maussion

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