Wikipedia
PALplus
PALplus (or PAL+) is an extension of the PAL analogue broadcasting system for transmitting 16:9 programs without sacrificing vertical resolution. It followed experiences with the HD-MAC and D2-MAC, standards that were incompatible with existing receivers but featured a 16:9 aspect ratio. It was developed in Germany University of Dortmund in cooperation with German terrestrial broadcasters and European and Japanese manufacturers.