VIDEO TOWER WITH LIBERAL GENERATOR FOR DISPLAYING CHARACTERS ON THE BACKGROUND

摘要

P THE INVENTION CONCERNED A VIDEO DRIVER. / P P ACCORDING TO THE INVENTION, IT INCLUDES A SIGNAL RESTITUTION MEANS 14, 16 PRODUCING A COMPOSITE VIDEO SIGNAL, A SIGNAL GENERATING DEVICE 36 PRODUCING A SIGNAL LIBELLE VIDEO AND A BACKGROUND SIGNAL, A FILTERING MEANS 50 CONNECTED TO THE GENERATOR TO LIMIT THE BANDWIDTH OF THE VIDEO SIGNAL BY LIBELLE TO A PREDETERMINED VALUE, THIS FILTER HAVING A CHARACTERISTIC DELAY; A CIRCUIT 60 CONNECTS TO THE GENERATOR TO EXTEND THE BACKGROUND SIGNAL FOR A PREDETERMINED TIME AFTER EACH OF ITS PRESENCE, THIS PREDETERMINING TIME CORRESPONDING TO A MULTIPLE DELAY; A MEANS OF OUTPUT 20; AND A SWITCH MEANS RESPONDING TO THE EXTENDED BACKGROUND SIGNAL TO COMBINE THE COMPOSITE VIDEO SIGNAL WITH THE BANDWIDTH LIMITED BANDWIDTH VIDEO SIGNAL. / P P THE INVENTION APPLIES IN PARTICULAR TO THE RESTITUTION OF VIDEODISKS. / P