An apparatus and method for encoding graphical data on an audio compact disc or laser vision disc without affecting the digitized sound stored in the main audio channel by utilizing what is known as the subcode channel of the compact or laser disc. The subcode channel is reserved for information other...http://www.google.de/patents/US4992886?utm_source=gb-gplus-sharePatent US4992886 - Method and apparatus for encoding data within the subcode channel of a compact disc or laser disc
