Digital modulation method for recordable digital video disc

This paper describes a modulation method suitable for high-density recording on an optical disc. This method, called 8-15 modulation method, is based on an 8-15 channel coding with longer minimum interval between transitions and an efficient DC component suppressing method. The maximum and minimum intervals between transitions of the 8-15 channel code achieve the theoretical limits for conversion of an 8-bit data word to a 15-bit codeword. The DC component suppressing method which adds several redundant bits to the 8-15 channel code, can suppress the low-frequency components of the channel bit stream. These features allow this method to extend the minimum interval between transitions and window margin by 5%, compared with EFMPlus. Additionally, this paper proposes a data format suitable for using the 8-15 modulation method and RS product code as the modulation method and error correcting code, respectively