Registers – Coded record sensors – Particular sensor structure
Patent
1997-03-17
1999-09-14
Evans, F. L.
Registers
Coded record sensors
Particular sensor structure
235436, G06K 710
Patent
active
059526440
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. In addition, a bar code read may include circuitry for detecting and eliminating imperfections in a scanned bar code.
REFERENCES:
patent: 5686716 (1997-11-01), La
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