METHOD OF CONVERTING A SERIES OF M-BIT INFORMATION WORDS TO A MODULATED SIGNAL, METHOD OF PRODUCING A RECORD CARRIER, CODING DEVICE, DEVICE, RECORDING DEVICE, SIGNAL, AS WELL AS A RECORD CARRIER

摘要

A method of converting a series of m-bit information words to a modulated signal. For each information word from the series an n-bit code word is delivered. The delivered code words are converted to the modulated signal. The code words are distributed over at least one group of a first type and at least one group of a second type. For the delivery of each of the code words belonging to the group of the first type the associated group establishes a coding state of the first type. When each of the code words belonging to the group of the second type is delivered, a coding state of the second type is established which is determined by an information word belonging to the delivered code word. When one of the code words is assigned to the received information word, this code word is selected from a set of code words based on the coding state. The sets of code words belonging to the coding states of the second type are disjunct. The DC and LF parameters of the modulated signal improve when in a coding state of the first type, by assigning a code word from a set of another state of the first type, while maintaining the dk-constraint. Selecting one of the sets of the first type results in the best momentary running DC value. The method can be applied to different coding state mechanisms.