G - Physics – 06 – F
Patent
G - Physics
06
F
354/223
G06F 11/10 (2006.01)
Patent
CA 1056952
ABSTRACT OF THE DISCLOSURE An error detection and correction system for use in a data proces- sing system wherein all single bit errors in a data word can be detected and corrected by the use of a unique modified Hamming code technique. In accord- ance therewith, during the write portion of a memory cycle, odd and even parity checks are made on a predetermined number of different, select com- binations of bits in each data word, to form a plurality of parity check bits which are combined with the original data word bits to form an extended data word. During the read portion of the memory cycle, the same number of odd and even parity checks are made on selected combinations of bits of the extended data word which combinations include the same selected combinat- ions of bits used during the write portion plus the parity check bit associat- ed therewith to provide a plurality of error bits. Th? error bits are decoded to identify the location of any single-bit error which may have occurred in the extended data word so that the bit in such location can be corrected.
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