Construction of Efficient Dc-Free Runlength-Limited Codes for Optical Recording

We will report on new dc-free runlength-limited codes (DCRLL) intended for the next generation of digital versatile disc (DVD). The efficiency of the newly developed DCRLL schemes is extremely close to the theoretical maximum, and as a result, significant density gains can be obtained with respect to prior art coding schemes. Preferred embodiments of the codes (footprints) and respective hardware realization will be considered.