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Definition of "magnetic recording code" |
method used to record data on a magnetic surface such as disk or tape. Codes that have been used include return-to-zero (RZ), in which two signal pulses are used for every bit—a change from negative to positive pulse (i.e., magnetization in the “negative” direction) is used for a stored 0, a change from a positive to a negative pulse (i.e., magnetization in the “positive” direction) is used for a stored 1, and a return to the demagnetized state is made between bits; non-return-to-zero (NRZ), in which a signal pulse occurs only for a change from 1 to 0 or from 0 to 1; non-return-to-zeroinverted (NRZI), in which a positive or negative pulse is used for—a sign change occurs for two consecutive 1s—and no pulse is used for a 0; double frequency (DF) (also knownas frequency modulation (FM)), which is similar to NRZI but which includes an interleaved clock signal on each bit cell; phase encoding (PE), in which a positive pulse is used for a 1 and a negative pulse is used for a 0; return-to-bias (RB), in which magnetic transitions are made for 1s but not for 0s, as in NRZI, but with two transitions for each 1; and modifiedreturn-to-bias (MRB), which is similar to RB, except that a return to the demagnetized state is made for each zero and between two consecutive 1s. |
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