parity check bit - meaning and definition. What is parity check bit
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What (who) is parity check bit - definition

BIT ADDED TO A BINARY STRING TO ENSURE THAT THE SUM OF THE BIT VALUES IS EVEN OR ODD; USED AS AN ERROR DETECTING CODE
Check bit; Parity Bit; Parity check; Parity (telecommunication); Even parity; Odd parity; Odd Parity; Even Parity; Parity checking; Check bits; Parity block; Parity error; Parity Error; Parity checking bit; Parity bits; Parity code; Bit interface parity

parity error         
<storage, communications> An error discovered by the inclusion of a parity bit. (1996-03-01)
Parity bit         
A parity bit, or check bit, is a bit added to a string of binary code. Parity bits are a simple form of error detecting code.
parity bit         
<storage, communications> An extra bit added to a byte or word to reveal errors. See parity. (1996-03-01)

Wikipedia

Parity bit

A parity bit, or check bit, is a bit added to a string of binary code. Parity bits are a simple form of error detecting code. 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.

The parity bit ensures that the total number of 1-bits in the string is even or odd. Accordingly, there are two variants of parity bits: even parity bit and odd parity bit. In the case of even parity, for a given set of bits, the bits whose value is 1 are counted. 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. If the count of 1s in a given set of bits is already even, the parity bit's value is 0. In the case of odd parity, the coding is reversed. 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. 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. Even parity is a special case of a cyclic redundancy check (CRC), where the 1-bit CRC is generated by the polynomial x+1.