Bar code reader with multiple sensitivity modes using variable t

Details Bar code reader with multiple sensitivity modes using variable t Bar code reader with multiple sensitivity modes using variable t

1995-06-07

1997-03-18

Shepperd, John

Registers

Coded record sensors

Particular sensor structure

327 73, G06K 710

Patent

active

056125313

ABSTRACT:
A multiple sensitivity-mode digitizer circuit for a bar code reader has circuits that perform two thresholding techniques. The bar code reader includes a first derivative circuit for receiving an analog signal from a scan of the bar code symbol and for generating a first derivative signal of the analog signal. The digitizer circuit includes a first thresholding circuit for generating a first digitized signal in response to a comparison between the first derivative signal and a first threshold representing a first detection sensitivity. A second thresholding circuit generates a second digitized signal in response to a comparison between the first derivative signal and a second threshold representing a second detection sensitivity. A mode selector selects as the output digitized signal one of the first digitized signal and a third digitized signal, the third digitized signal representing the first digitized signal modified by the second digitized signal.

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