In a system wherein video data and audio data are reproduced in a non-presentation mode of sub-picture data, control information having an effect process command is transferred to a system CPU before the video data is transferred to a decoder section. After the reproduction of the video data...http://www.google.co.uk/patents/US5835671?utm_source=gb-gplus-sharePatent US5835671 - Data recording medium having reproduction timing information, and system for reproducing record data by using the reproduction timing information 
