Difference between revisions of "Non Return to Zero Inverted"
From Computer History Wiki
m (Usually given as the acronym) |
m (Proper cat) |
||
| Line 1: | Line 1: | ||
'''Non Return to Zero Inverted''' (usually given as the acronym, '''NRZI''') is an [[encoding]] technique which is commonly used on [[magnetic storage]]. | '''Non Return to Zero Inverted''' (usually given as the acronym, '''NRZI''') is an [[encoding]] technique which is commonly used on [[magnetic storage]]. | ||
| − | In NRZI, whether a particular [[bit]] is '0' or '1' is indicated by the presence or absence of a level transition at each clock time. | + | In NRZI, whether a particular [[bit]] is '0' or '1' is indicated by the presence or absence of a level transition at each [[clock]] time. |
The disadvantage of NRZI is that a long strings of whichever value does ''not'' cause a level transition makes it hard to make sure that the clock stays in [[synchronization]]. For this reason, many NRZI encooding systems make use of either [[bit stuffing]] or [[run-length limited coding]] to limit the maximum number of transition-less bit times. | The disadvantage of NRZI is that a long strings of whichever value does ''not'' cause a level transition makes it hard to make sure that the clock stays in [[synchronization]]. For this reason, many NRZI encooding systems make use of either [[bit stuffing]] or [[run-length limited coding]] to limit the maximum number of transition-less bit times. | ||
| − | {{stub}} | + | {{semi-stub}} |
Revision as of 03:36, 20 October 2018
Non Return to Zero Inverted (usually given as the acronym, NRZI) is an encoding technique which is commonly used on magnetic storage.
In NRZI, whether a particular bit is '0' or '1' is indicated by the presence or absence of a level transition at each clock time.
The disadvantage of NRZI is that a long strings of whichever value does not cause a level transition makes it hard to make sure that the clock stays in synchronization. For this reason, many NRZI encooding systems make use of either bit stuffing or run-length limited coding to limit the maximum number of transition-less bit times.
