Error Detection Codes and Correction Codes(5)

• Example: Odd-parity code for ASCII code characters:

• Error detection: Check whether a code word has the correct parity.
• Single-error detection code (dmin = 2).
  

• Two-out-of-Five Code

  • Each code word has exactly two 1’s and three 0’s.
  • Detects single errors and multiple errors in adjacent bits.

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