An integrated digital video system is configured to implement picture-in-picture merging of video signals from two or more video sources, as well as selective overlaying of on-screen display graphics onto the resultant merged signal. The picture-in-picture signal is produced for display by a television...http://www.google.com/patents/US6519283?utm_source=gb-gplus-sharePatent US6519283 - Integrated video processing system having multiple video sources and implementing picture-in-picture with on-screen display graphics
