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==[7,4] Hamming code==
[[File:Hamming(7,4).svg|thumb|300px|Graphical depiction of the four data bits and three parity bits and which parity bits apply to which data bits]]▼
{{main|Hamming(7,4)}}
▲[[File:Hamming(7,4).svg|thumb|300px|Graphical depiction of the four data bits and three parity bits and which parity bits apply to which data bits]]
In 1950, Hamming introduced the [7,4] Hamming code. It encodes four data bits into seven bits by adding three parity bits. As explained earlier, it can either detect and correct single-bit errors or it can detect (but not correct) both single and double-bit errors.
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