Parity Bit (奇偶校验码)

Abstract

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• The use of an additional bit to check whether the number of 1s in a binary number is even or odd
• Used to detect errors in data transmission or storage
• 2 types - Odd & Even, the bit value is the opposite, if odd number, then 0 for Odd, if even number, then 0 for Even
• Commonly used with ASCII

Odd Parity Bit (奇校验码)

The parity bit is set to

• 0 if the number of 1s is odd
• 1 if the number of 1s is even
• Can’t produce a string that is all 0

Even Parity Bit (偶校验码)

The parity bit is set to

• 0 if the number of 1s is even
• 1 if the number of 1s is odd