Error detection/correction system

Details Error detection/correction system Error detection/correction system

1975-11-17

1977-03-22

Atkinson, Charles E.

Communications: electrical

Digital comparator systems

235 617A, G06F 1112, G06K 500

Patent

active

040139972

ABSTRACT:
In the automatic processing of documents having bar encoded printing thereon, selectively variable error detection and correction codes are added to a bar encoded data field. Read errors which may occur from the reading of document data fields having overprints of inks of various types, colors and densities thereby may be substantially reduced. More particularly, either, neither or both a random parity code and a Bose-Chaudhuri-Hocquenghem (BCH) code may be added to a data message for a bar code printing to accommodate error correction and detection systems having differing processing capabilities. Further, the BCH code may be dynamically and selectively altered to accommodate both documents and data fields of varying lengths.

REFERENCES:
patent: 3471830 (1969-10-01), McRaie et al.
patent: 3506961 (1970-04-01), Abramson et al.
patent: 3703628 (1972-11-01), Phillipson, Jr.
patent: 3753227 (1973-08-01), Patel
patent: 3780271 (1973-12-01), Sharkitt et al.
patent: 3886521 (1975-05-01), Dobras
patent: 3925760 (1975-12-01), Mason et al.
R. T. Chien, Memory Error Control; Boost Computer Memory Reliability, IEEE Spectrum, July 1973, pp. 18-23.

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