METHOD OF CONVERTING A USER BITSTREAM INTO CODED BITSTREAM, METHOD FOR DETECTING A SYNCHRONIZATION PATTERN IN A SIGNAL, A RECORD CARRIER, A SIGNAL, A RECORDING DEVICE AND A PLAYBACK DEVICE ALL USING A FREELY INSERTABLE SYNCHRONIZATION PATTERN

摘要

This invention proposes synchronization patterns for RLL codes with a constraint. Instead of including the synchronization pattern in the pattern the pattern is chosen to have p leading bits and q trailing bits such that all channel code constraints are met by the last code word of the section preceding the synchronization pattern together with the p leading bits and by a first code word of the section following the synchronization pattern together with the q trailing bits of the synchronization pattern. This results in a freely insertable synchronization pattern that can be inserted after coding and removed before decoding resulting in an more efficient coder and decoder.