Two dimensional coding for a multiple-track, maximum-likelihood digital magnetic storage system

Two dimensional run-length-limited (d, k/sub y/) modulation codes were recently introduced as a means of increasing storage capacity in multi-track recording systems. This paper furthers this coding technique by describing a reverse enumeration scheme based on the trellis description of the (d, k/sub y/) constraint for a channel employing extended class IV partial response signalling and maximum likelihood detection.<
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