US PATENT SUBCLASS 341 / 74
.~.~ To or from double density code

Current as of: June, 1999
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341 /   HD   CODED DATA GENERATION OR CONVERSION

50  DF  DIGITAL CODE TO DIGITAL CODE CONVERTERS {38}
68  DF  .~ To or from NRZ (nonreturn-to-zero) codes {6}
74.~.~ To or from double density code

DEFINITION

Classification: 341/74

To or from double density code:

(under subclass 68) Subject matter for converting digital signals to or from other digital signals where a one is a transition at the end of a bit period and a zero is a transition at the center of a bit period, except when a zero follows a one, in which case there is no transition in the bit period.