| Popis: |
MultiLevel encoding has been demonstrated to significantly increase the linear densities achieved with standard methods of binary encoding in optical data storage systems. An overview of the channel is provided from write encoder and pre-compensation, to readout with a matched adaptive equalizer and Viterbi decoder. Our multilevel channel has been implemented in silicon and designed to operate in parallel with the standard binary channel, thus maintaining full backward functionality of the underlying drive. We have developed an efficient research, development, prototyping, and integration process that allows us to accomplish final system implementation with minimal impact to the host system. We discuss our "helper" servo and firmware functions that ease integration of the multilevel LSI into existing circuit-board architecture, firmware, and software bases. The focus of this paper is on our fully-functional 2GB enhanced CD-R/RW external drive, but we also discuss briefly how multilevel technology has been shown to add to ROM, DVD, and advanced blue-laser, high-NA optic systems. |
