Even parity is a special case of a cyclic redundancy check (CRC), where the 1-bit CRC is generated by the polynomial x+1. If the count of bits with a value of 1 is odd, the count is already odd so the parity bit's value is 0. For a given set of bits, if the count of bits with a value of 1 is even, the parity bit value is set to 1 making the total count of 1s in the whole set (including the parity bit) an odd number. In the case of odd parity, the coding is reversed. If the count of 1s in a given set of bits is already even, the parity bit's value is 0. If that count is odd, the parity bit value is set to 1, making the total count of occurrences of 1s in the whole set (including the parity bit) an even number. In the case of even parity, for a given set of bits, the bits whose value is 1 are counted. Accordingly, there are two variants of parity bits: even parity bit and odd parity bit. The parity bit ensures that the total number of 1-bits in the string is even or odd. Parity bits are generally applied to the smallest units of a communication protocol, typically 8-bit octets (bytes), although they can also be applied separately to an entire message string of bits. Parity bits are a simple form of error detecting code. JSTOR ( January 2022) ( Learn how and when to remove this template message)Ī parity bit, or check bit, is a bit added to a string of binary code. Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification.
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