| 摘要 |
A method of converting m-bit information words to a run-length constrained modulated signal includes converting the information words into n-bit code words. The available code words are distributed over at least one group (G 1 ) of a first type and at least one group (G 2 ) of a second type. The selection of a code word belonging to the group of the first or second type establishes a coding state of the first type (S 1 ) or one of a number r of coding states (S 2 , S 3 ) of the second type, depending on the current information word. For each information word, a subset of code words is available, this subset having at least one disjunct code word for each of the r coding states. The selection from the subset of the code word to be delivered is based the coding state, on dynamically verifying the run-length constraint for the sequence of code words, and on an additional criterion, like the low frequency content of the modulated signal.
|
