A new 8-14 channel coding for high density recording

The D-3 has achieved a recorded density some 2.5 times higher than those of conventional VTRs. Channel coding, which is capable of high-density recording and is suited for the head-tape recording system, is one of today´s most important high-density recording technologies, and a new 8-14 channel coding has been developed and employed for the D-3 format. The paper presents the requirements for channel coding which are required in digital VTRs and explain in detail the generation of the new 8-14 channel coding meeting these requirements, which is a type of DC-free run-length-limited block coding. It explains the actual procedure and configurations of the channel encoder/decoder for 8-14 channel coding. It also compares and examines channel coding methods that have been used until now from several aspects, and describes their features