A local language is pre-stored in permanent memory. Equivalent data is transmitted in the vertical blanking interval (VBI) to television receivers. Each equivalent data set comprises a unique language identifier and a foreign language translation of, or graphical representative of, the local language...http://www.google.co.uk/patents/US6456331?utm_source=gb-gplus-sharePatent US6456331 - Method and apparatus for displaying textual or graphic data on the screen of television receivers
