A CDE Definition
(Non-Return-to-Zero) A data modulation method in which the 0s and 1s are represented by different polarities, typically positive for 0 and negative for 1. See NRZI.
(Non-Return-to-Zero Inverted) A magnetic recording and data modulation method in which the polarity of the bit is reversed when a 1 bit is encountered. All subsequent 0s following the 1 are recorded at the same polarity. See NRZ.
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