Registers – Coded record sensors – Particular sensor structure
Patent
1993-11-12
1996-08-20
Hajec, Donald T.
Registers
Coded record sensors
Particular sensor structure
G06K 710
Patent
active
055481086
ABSTRACT:
A method and apparatus for processing the information in a sequence of bar code symbols. The information contained in one symbol can be decoded and processed while the information in the next symbol is being gathered. A pulse width counter, under control of a microprocessor, accumulates counts representing the widths of the elements of a bar code symbol and the accumulated counts are latched into a separate latch buffer which is then transferred into the microprocessor memory by a direct memory access controller. A program in the microprocessor operates on the information stored in the microprocessor memory to decode, process and output the data and/or commands contained within a given symbol as the pulse width counter is accumulating the counts that represent the next symbol to be read. If the input device is an automated scanner, the scanner's Start-of-Scan signal is used by the microprocessor to specify the beginning and end of each scan. If the input device is a wand, the microprocessor interprets an overflow of the pulse width counter as signifying the end of the wand scan.
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Reading Between the Lines, An Introduction to Bar Code Technology Craig K. Harmon and Russ Adams, Jan. 1989, Helmers Publishing, pp. 11, 242.
Moldskred Walt
Ramberg Jon R.
Hajec Donald T.
Intermec Corporation
Tremblay Mark
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