# Detecting and Correcting Bit Errors

**Hamming distance** • Measures the number of bit flipsto change one codeword into another • **Hamming distance** between two messages m 1, m 2: The number of bit flips needed to change m 1into m 2 • Example: Two bit flips needed to change codeword 00 to codeword 11, so they are **Hamming distance** of twoapart: 17 00 01 11

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