Location dependent maximum transition run length code with alternating code word length and efficient K constraint

摘要

An encoder and a method of encoding successive data words into successive code words having alternating code word lengths. Each code word has a plurality of bit locations. A first maximum transition run constraint is imposed on a first set of the bit locations, wherein each bit location in the first set is spaced S bit locations apart from one another, and S is an integer greater than one. A second maximum transition run constraint, which is different than the first maximum transition run constrain, is imposed on a second set of the bit locations, wherein the second set comprises each of the bit locations that are not in the first set. The alternating code word lengths and the value of S are defined such that corresponding bit locations in successive code words have the same maximum transition run constraint.