These types of "scramble" codes are common in telecom for doing things like "ones density".
I wouldn't even call them "scrambled", that seems to be a term that picked up somewhere in D-STAR. Telecom engineers would simply call this "line coding" of different sorts. Study all of these, and you'll never have insomnia again... <http://en.wikipedia.org/wiki/Line_code> (And even more "fun"... do it from the EIA/TIA spec documents instead of Wikipedia's "distilled" versions. Or see the SINGLE bit error in a new product in the lab while staring for hours at a protocol analyzer. Heh heh.) GRIN... Nate WY0X
