METHOD AND APPARATUS FOR INVERTIBLY MAPPING BINARY SEQUENCES INTO RATE 2/3 (1,K) RUN-LENGTH-LIMITED CODED SEQUENCES WITH MAXIMUM TRANSITION DENSITY CONSTRAINTS

摘要

A method and means for reducing high-duty-cycle unconstrained binary signal sequences in storage and communications processes and systems by invertibly mapping such sequences into a (1, k) rate RLL codestream constrained to a duty cycle substantially approximating one-third. That is, binary sequences ordinarily mapping into high-duty-cycle RLL-code sequences are either inhibited from repeating indefinitely or excluded.