Table lookup direct decoder for double-error correcting (DEC) BC

Details Table lookup direct decoder for double-error correcting (DEC) BC Table lookup direct decoder for double-error correcting (DEC) BC

1975-12-29

1977-06-14

Atkinson, Charles E.

Communications: electrical

Digital comparator systems

235153AM, G06F 1112

Patent

active

040300676

ABSTRACT:
Apparatus for directly decoding and correcting double-bit random errors per word and for detecting triple-bit errors per word is disclosed. Said apparatus comprises a syndrome calculator which operates upon codewords received from memory and generates syndromes. The syndromes are operated upon and translated by a mapping device which generates pointers identifying the bits which are in error. The pointers are then passed through decoding means to generate error words which are summed with the received word from memory to provide a corrected codeword. The syndrome calculator may further provide a parity check signal to determine if a three-bit error is present, in which case the decoding means are not enabled and a signal is generated indicating that a triple-bit error has been detected which is not correctable.

REFERENCES:
patent: 3685014 (1972-08-01), My-Yue Hsiao et al.
patent: 3697948 (1972-10-01), Bossen
patent: 3714629 (1973-01-01), Hong et al.
patent: 3755779 (1973-08-01), Price
patent: 3958220 (1976-05-01), Marshall

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