Registers – Coded record sensors – Particular sensor structure
Patent
1992-06-18
1993-03-23
Pitts, Harold
Registers
Coded record sensors
Particular sensor structure
235463, 235472, G06K 710
Patent
active
051966859
ABSTRACT:
The present invention relates to a bar code reader for reading bar codes and converting them into resepective alphanumeric code signals. The bar code reader includes a scanner for scanning bar codes presented thereto, a timing pulse generating circuit, a sample and holding means, a pattern memory for storing matching bit patterns for a set of bar codes, and a pattern matching circuit. In operation, levels of a rectangular wave output signal generated by the scanner from scanning a bar code are successively read into the sample and holding means in response to predetermined sequence timing pulses provided by the time pulse generating means to store corresponding data bit pattern output signals. The pattern matching circuit compares the data bit pattern output signals from the sample and holding means with matching bit pattern signals stored in the pattern memory. From such pattern signal comparisions, the pattern matching circuit determines which of the matching bit pattern signals is the most likely to be the bar code in question. The pattern matching circuit then converts the determined most similar matching bit pattern signals into the alphanumeric code signal and outputs it.
REFERENCES:
patent: 4074115 (1978-02-01), Sugiura et al.
patent: 4239151 (1980-12-01), Enser et al.
patent: 4902883 (1990-02-01), Poland
Eastman Kodak Company
Owens Raymond L.
Pitts Harold
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