交替反转码 Bipolar encoding
（重定向自Bipolar coding）
交替反转码(Alternative Mark Inversion，简称AMI)是一种适用于基带传输的编码方式，取代高电平的有无这样的传输方式，而采用双极性，即高低电平来作为传输信息的方式。
Bipolar coding
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Bipolar encoding 交替反转码
（重定向自Bipolar coding）
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. Standard bipolar encodings are designed to be DC-balanced, spending equal amounts of time in the + and − states.
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