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Modified Frequency Modulation - Coding | | Modified Frequency Modulation - Coding: Encyclopedia II - Modified Frequency Modulation - Coding | | Notice that two "ones" can't appear together, and the maximum number of zeros in a row is three. This bit stream is then NRZI encoded to be written to disk, a 1 bit representing a magnetic transition, and a 0 bit no transition.
Example:
1 0 1 0 0 0 0 1 ($A1)
0100010010101001 ($44A9)
0100010010001001 ($4489 - sync mark)
^ missing clock
Hexadecimal 4489 is typically used as a unique synchronization mark.
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See also:Modified Frequency Modulation, Modified Frequency Modulation - Coding | | | Modified Frequency Modulation, Modified Frequency Modulation - Coding, Group Code Recording | | |
| | | Modified Frequency Modulation: Encyclopedia II - Modified Frequency Modulation - Coding
Modified Frequency Modulation - Coding
Notice that two "ones" can't appear together, and the maximum number of zeros in a row is three. This bit stream is then NRZI encoded to be written to disk, a 1 bit representing a magnetic transition, and a 0 bit no transition.
Example:
1 0 1 0 0 0 0 1 ($A1)
0100010010101001 ($44A9)
0100010010001001 ($4489 - sync mark)
^ missing clock
Hexadecimal 4489 is typically used as a unique synchronization mark.
Other related archivesCP/M, DOS, FOLDOC sourced articles, Free On-line Dictionary of Computing, GFDL, Group Code Recording, Line codes, NRZI, PCs, Rotating disc computer storage media, Run Length Limited (RLL), floppy disk, frequency modulation, hard disk, kbit/s, licensed, line code
 Adapted from the Wikipedia article "Coding", under the G.N U Free Docmentation License. Please also see http://en.wikipedia.org/wiki |
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