Error detection and correction

Details Error detection and correction Error detection and correction

1977-07-01

1978-10-10

Atkinson, Charles E.

Communications: electrical

Digital comparator systems

G06F 1112

Patent

active

041199456

ABSTRACT:
An error detection and correction system in which at least the highest order bit of each data word is given a greater protection against errors in transmission than lower order bits. Useful for digitized TV signals where errors in received high order bits have much worse effect on picture quality than errors in low order bits. A parity is generated for each data word in accordance with a self-orthogonal convolutional code constructed by the use of the base elements of a difference triangle for each bit of the data word, the difference triangles being disjoint, the triangle associated with the highest order bit or bits having a large number or numbers of base elements, and the triangles associated with the lowest order protected bit or bits consisting of a single base element. Errors in received code words are detected and corrected in a decoder including majority logic threshold detectors. Error correcting feedback to the syndrome shift register is limited to errors detected in the high order bits.

REFERENCES:
patent: 3227999 (1966-01-01), Hagelbarger
patent: 3469236 (1969-09-01), Gallager
patent: 3500320 (1970-03-01), Massey
patent: 3571795 (1971-03-01), Tong
Peterson & Weldon, Error Correcting Codes, The MIT Press, 1972, pp. 404-409.

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