Decoding method and system for ETAB bar code

Details Decoding method and system for ETAB bar code Decoding method and system for ETAB bar code

1979-10-23

1981-01-13

Kilgore, Robert M.

Registers

Coded record sensors

Particular sensor structure

235462, 235466, 3401463Z, G06K 710, G06K 1904, G06K 900

Patent

active

042451523

ABSTRACT:
A high density bar code scanned to be read out provides a time varying analog electric signal which after being reshaped is decoded, i.e., converted into a binary bit representation based on distances measured between consecutive leading and consecutive trailing edges of the reshaped analog signal. Errors due to mismeasurements are minimized by using a decoding process based on comparison of each measuring distance to a first or to a second preset threshold level. The choice of the threshold to be used for decoding a given bit depends on the odd or even characteristic of the number of bits previously decoded on the same bit stream. In addition, at least one of the thresholds is dynamically readjusted throughout the process, based on the last measured distance.

REFERENCES:
patent: 3723710 (1973-03-01), Crouse
patent: 3763351 (1973-10-01), Deerhake
patent: 3860792 (1975-01-01), Myren
patent: 3882301 (1975-05-01), Nassimbene
patent: 3891831 (1975-06-01), Coles
patent: 3979577 (1976-09-01), Seligman
Phillips & Ross-ETAB Bar Code, IBM Tech. Disc. Bull., vol. 21, No. 7, Dec. 1978, pp. 2883-2884.
Drew and Jones-Increased Density Self-Clocking Bar Code, IBM Tech. Disc. Bull., vol. 13, No. 10, p. 3181, Mar. 1971.

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