The also called longitudinal parity check, parallel parity check, and two-dimensional parity check, was developed as a fairly straightforward extension of the simple parity check. the intent was to improve on the performance of the latter in the face of even numbers of bit errors.

The horizontal parity check

The horizontal parity check or the longitudinal parity check/Longitudinal redundancy check is the count of odd or even parity for all bits in a message. This process acts a precaution against transmission error. Additionally, this parity check is performed on a serial sequence of binary digits recorded on a single track of data medium or arrive in serial sequence on a single wire.

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