non return to zero - definizione. Che cos'è non return to zero
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Cosa (chi) è non return to zero - definizione

LINE CODE IN WHICH THE SIGNAL VALUE DOES NOT RETURN TO ZERO AFTER EACH PULSE
Non-return-to-zero, inverted; NRZI; Non return to zero; Non return to zero, inverted; Non-return-to-zero space; Nrz-l; Polar encoding; NRZ encoding; NRZ-L; NRZ-I; NRZS; NRZM; NRZL; Non-Return-to-Zero; Non-Return-to-Zero Inverted; Non-return to zero; NRZI-S; SNRZI; Synchronized NRZI; Randomized NRZ; Randomized NRZI; RNRZI; RNRZ; Randomised NRZI; Randomised NRZ; Synchronised NRZI; NRZ-S; NRZ-M; NRZ(M); NRZ(S); NRZ(I); NRZ(L); NRZ-C; NRZC; NRZ(C); Inhibit code; IBM code; Non-Return to Zero; Non-Return to Zero Inverting; Non-return to zero inverting; Non-return-to-zero inverting; Non-return-to-zero-inverting
  • An example of the NRZI encoding,  transition on 1
  • The binary signal is encoded using rectangular pulse-amplitude modulation with polar NRZ(L), or polar non-return-to-zero-level code
  • The opposite convention, transition on 0
  •  Unipolar NRZ(L), or unipolar non-return-to-zero level
  • Non-return-to-zero space
  • Encoder for NRZI, toggle on one
  • Encoder for NRZS, toggle on zero

Non-return-to-zero         
In telecommunication, a non-return-to-zero (NRZ) line code is a binary code in which ones are represented by one significant condition, usually a positive voltage, while zeros are represented by some other significant condition, usually a negative voltage, with no other neutral or rest condition.
NRZI         
NRZI         
Non-Return-to-Zero, Invert to ones [Additional explanations: encoding]

Wikipedia

Non-return-to-zero

In telecommunication, a non-return-to-zero (NRZ) line code is a binary code in which ones are represented by one significant condition, usually a positive voltage, while zeros are represented by some other significant condition, usually a negative voltage, with no other neutral or rest condition.

For a given data signaling rate, i.e., bit rate, the NRZ code requires only half the baseband bandwidth required by the Manchester code (the passband bandwidth is the same). The pulses in NRZ have more energy than a return-to-zero (RZ) code, which also has an additional rest state beside the conditions for ones and zeros.

When used to represent data in an asynchronous communication scheme, the absence of a neutral state requires other mechanisms for bit synchronization when a separate clock signal is not available. Since NRZ is not inherently a self-clocking signal, some additional synchronization technique must be used for avoiding bit slips; examples of such techniques are a run-length-limited constraint and a parallel synchronization signal.