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

摘要

The Patent Applications relates to a method of converting a series of m-bit information words (1) to a modulated signal (7). For eac h information word from the series an n-bit code word (4) is delivered. The de livered code words (4) are converted to the modulated si gnal (7). The code words (4) are distributed over at least one group (G11, G12) o f a first type and at least one group (G2) of a second t ype. For the delivery of each of the code words belonging to the group (G11, G12) of the first type the associated group establishes a co ding state (S1, S4) of the first type. When each of the code words (4) belonging to the group (G2) of the second type is delivered, a cod ing state (S2, S3) of the second type is established which is determined by an i nformation word belonging to the delivered code word. Wh en one of the code words (4) is assigned to the received information word (1), this code word is selected from a set (V1, V2, V3, V4) o f code words which depends on the coding states (S1, S2, S3, S4). The sets of code words (V2, V3) belonging to the coding states (S1, S2) o f the second type are disjunct. In this coding method the number of unique bit com binations that may be established by the code words in t he series are enlarged. The modulated signal (7) thus obtained may be reconvert ed toinformation words (4) by first converting the modu lated signal (7) to a series of code words (4) and then assigning an information w ord (1) to each of the code words from the series in dep endence on the code word to be converted and also in dependence on the logical value s of the bit string bits which are situated at predeterm ined positions relative to the code word. Furthermore, a recording device and a r eading device are disclosed.