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Encyclopedia > Non return to zero, inverted

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Non-return-to-zero - Wikipedia, the free encyclopedia (215 words)
The binary signal is encoded using rectangular pulse amplitude modulation with polar non-return-to-zero code
In telecommunication, a non-return-to-zero (NRZ) line code is a binary code in which "1s" are represented by one significant condition and "0s" are represented by another, with no neutral or rest condition, such as a zero amplitude in pulse amplitude modulation (PAM), zero phase shift in phase-shift keying (PSK), or mid-frequency in frequency-shift keying (FSK).
The pulses have more energy than a RZ code, but it does not have a rest state, which means a synchronization signal must also be sent alongside the code.
Multi-track digital recording and playback system - Patent 4533964 (3696 words)
This invention relates to a digital recording and playback system in which digital signals of non-return-to-zero inverted format are recorded at high density using a plurality of stationary magnetic heads.
More specifically, the output of the precoder 7.sub.1 changes its pulse level from "0" to "1" or vice versa depending on the previous pulse level in response to the occurrence of each "1" bit of input NRZ signal and retains the pulse level when the input signal is "0", as shown in FIG.
The noninverting and inverting inputs of the comparators 22 and 23 are coupled together to an input terminal 21 to which an output signal a (FIG.
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