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bipolar encoding
In telecommunication, bipolar encoding is a type of line code, where two nonzero values are used, so that the three values are +,-, and zero. Such a signal is called a duobinary signal. Bipolar encoding typically has at least a rough a balance of +'s and -'s.
It must pass trough 0 at every bit transferred
== Alternate mark inversion ==
One kind of bipolar encoding is a paired disparity code. The simplest example of this is alternate mark inversion. In this code, a binary 0 is encoded as zero volts, as in unipolar encoding, whereas a binary 1 is encoded alternately as a positive voltage or a negative voltage. The name arose because, in the context of a T-carrier, a binary '1' is referred to as a "mark", while a binary '0' is called a "space".〔("alternate mark inversion (AMI) signal", ''ATIS Telecom Glossary 2000'', last updated 28 February 2001, retrieved 25 January 2007 )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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