CRC cyclic redundancy check polynomial code CRC code D X C X R
X D X +R X D X +R X C X 0 C X CRC-12 X 12 +X 11 +X 3 +X 2 +X+1
CRC-CCITT X 16 +X 15 +X 5 +1
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hamming code bit 1100001 hamming code 01001010110 7 bit