https://dccwiki.com/What_is_meant_by_a_bi-polar_signal%3F FAQ:What is meant by a bi-polar signal? - DCCWiki

FAQ:What is meant by a bi-polar signal?

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Each bit is divided into two halves, which are “mirrored” around zero volts: Note that the bottom half of the signal (below zero volts) is a mirror image of the top half, but shifted over half a bit width.