Spectral characteristics of a class of DC free error-correcting transmission codes
A. Popplewell, John J. O'Reilly · Electronics Letters · 1988
A class of DC free codes proposed by Herro is examined and given an alphabetic line code interpretation enabling the code spectra to be evaluated. These and also the disparity bounds are found to be strongly influenced by the choice of disparity modification vectors; appropriate new selection rules are introduced yielding improved run length and disparity characteristics.