An optical disc system is being developed to address wideband archival digital data storage applications.This system, which has the capability for "instant" playback (i.e., within a few bit periods), is configured about an RCA -proprietary "trilayer" optical d 4c structure.
A run -length -limited code, designated 3(1,7), has been applied to optical disc recorders for the purpose of increasing the information capacity of a disc.The 34)(1,7) code was selected by an organized search of an extensive collection of NRZ -like, phase, and run-lengthlimited codes.Theoretical examination indicated that greater than a 20% linear packing density increase could be expected under the conditions that the recorder was forming the smallest pits possible. The factors which led to this conclusion and the properties of the 3¢(1,7) code are discussed.Details of an experimental verification of the conclusions reached herein are presented in a companion paper, "Implementation of 3q(1,7) code for improving packing density on optical disc recorders," by P. Hess and J. Waring.
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