TITLE:        Two-dimensional modulation codes
AUTHORS:      M. W. Marcellin and H. J. Weber
CONFERENCE:   IEEE International Symposium on Information Theory, 
              Budapest, Hungary, June 1991
ABSTRACT:
A new class of run-length-limited codes is introduced. These codes are 
called two-dimensional or multi-track modulation codes.  Two-dimensional
modulation codes provide substantial data storage density increases for
multi-track recording systems by operating on multiple tracks in parallel.
Procedures for computing the capacity of these new codes are given along 
with fast algorithms for implementing these procedures. Examples of 
two-dimensional codes are given to provide a comparison between the 
encoding rates obtainable with multi-track codes and traditional 
single-track codes.