In telecommunication

Telecommunication

Telecommunication is the transmission of information over significant distances to communicate. In earlier times, telecommunications involved the use of visual signals, such as beacons, smoke signals, semaphore telegraphs, signal flags, and optical heliographs, or audio messages via coded...

, a paired disparity code is a line code

Line code

In telecommunication, a line code is a code chosen for use within a communications system for baseband transmission purposes...

 in which some or all of the characters are represented by two sets of digits of opposite disparity

Disparity

Disparity and disparities may refer to:in healthcare:* Health disparitiesin finance:* Income disparity between females and males.**Male–female income disparity in the United States**Income gender gap* Economic inequality...

 that are used in sequence

Sequence

In mathematics, a sequence is an ordered list of objects . Like a set, it contains members , and the number of terms is called the length of the sequence. Unlike a set, order matters, and exactly the same elements can appear multiple times at different positions in the sequence...

 so as to minimize the total disparity of a longer sequence of digits.

An alternate mark inversion signal is an implementation of a paired disparity code.

The digits may be represented by disparate physical quantities, such as two different frequencies, phases, voltage levels, magnetic polarities, or electrical polarities, each one of the pair representing a 0 or a 1.