A method and apparatus for playback of a data recording disc which contains a CD area in which a signal such as an audio signal is recorded in digital form and a video area in which a FM-modulated video signal is recorded with a digital audio signal superimposed thereon. The position of a data detection...http://www.google.com.au/patents/US4761692?utm_source=gb-gplus-sharePatent US4761692 - Method and apparatus for data recording disc playback
