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non return to zero inverted (NRZ-I)

The two-valued encoding method Non Return to Zero Inverted (NRZ-I) is an inversion of Non Return to Zero (NRZ) and Non Return to Zero Level (NRZ-L).

NRZ and NRZ-I Coding

NRZ and NRZ-I Coding

If the digital signal has a 1, the level of the NRZ-I signal has a low or negative level, if the digital signal represents a 0, the level of the NRZ-I signal is High. There is a logical NOT function between the NRZ-L signal and the NRZ-I signal. If one level is high, the other is low and vice versa.

NRZ-I coding, like NRZ coding, is a simple conversion of the level states with inversion. It has the disadvantage that with long 0 and 1 sequences the synchronization can get out of step.

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Englisch: non return to zero inverted - NRZ-I
Updated at: 03.07.2010
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