Patent ID: 6112011
Filing Date: 2000-08-29
Classification: G11B,H04N

Abstract:
An apparatus for reproducing data from an optical disk, said optical disk comprising:(a) a video stream including a plurality of video packs, each of said video packs having compressed video data;(b) a first audio stream including a plurality of audio packs, each of said audio packs having encoded audio data; and(c) first and second sub-picture streams, each of said subpicture streams including a plurality of sub-picture packs having sub-picture data, said first sub-picture stream having a first language and said second sub-picture stream having a second language;wherein each of said first and second sub-picture streams comprises a plurality of sub-picture data units, each of said plurality of sub-picture data units corresponding to a reproduction unit of the corresponding sub-picture stream and a sequential portion of said plurality of sub-picture packs and comprising (1) a sub-picture unit header, (2) pixel data to be produced as the sub-picture data, and (3) a display control sequence table, said display control sequence table including a display control sequence, said display control sequence having (3a) a display control command for controlling a display of the pixel data and (3b) a start time of executing the display control command, andwherein the display control command of at least one among the plurality of sub-picture data units is a forcible display command;said apparatus comprising:(d) retrieving means for retrieving the video, audio and sub-picture packs from said optical disk;(e) sub-picture stream selecting means for indicating one of said first and second sub-picture streams in a sub-picture selecting mode and for indicating a predetermined one among the first and second sub-picture streams in a sub-picture non-selecting mode;(f) decoding means for (f1) decoding the sub-picture data units of the first sub-picture stream into a plurality of first sub-picture signals for presenting information of the first sub-picture stream in the first language and for (f2) decoding the sub-picture data units of the second sub-picture stream into a plurality of second sub-picture signals for presenting information of the second sub-picture stream in the second language;(g) mode setting means for setting one of a sub-picture presentation mode and a sub-picture non-presentation mode; and(h) control means for (h1) controlling said decoding means, when the presentation mode is set, to output those among the first and second sub-picture signals which correspond to the indicated one of the first and second sub-picture streams, for (h2) controlling said decoding means, when the non-presentation mode is set, to output those among the first and second sub-picture signals which correspond to said at least one among the plurality of sub-picture data units of the indicated one of the first and second sub-picture streams having the forcible display command, and for (h3) preventing said decoding means, when the non-presentation mode is set, from outputting those among the first and second sub-picture signals which correspond to those among the plurality of sub-picture data units that do not have the forcible display command.