paritásellenrz

Paritásellenrz is a Hungarian term that translates to "parity check" in English. It refers to a simple error-detection method used in digital communication and data storage. The core principle of a parity check is to add an extra bit, known as the parity bit, to a block of data. This parity bit is set to either 0 or 1 based on the number of 1s in the original data.

There are two main types of parity checks: even parity and odd parity. In an even parity system, the parity bit is set so that the total number of 1s in the data, including the parity bit, is an even number. Conversely, in an odd parity system, the parity bit is set to make the total number of 1s odd.

During data transmission or storage, the receiving system also calculates the parity of the received data. If the calculated parity matches the received parity bit, it is assumed that the data has been transmitted without error. If there is a mismatch, it indicates that at least one bit error has occurred.

While simple and easy to implement, parity checks can only detect an odd number of bit errors. If an even number of bits are flipped during transmission, the parity check will not detect the error. Therefore, it is a basic form of error detection and is often used in conjunction with more robust error correction codes for critical applications. Parity checks were historically used in various communication protocols and early computer memory systems.