Patent ID: 6556772
Filing Date: 2003-04-29
Classification: G11B,H04N

Abstract:
An information medium arranged for record or playback of a plurality of pieces of audio or video information at discrete positions by a record or playback apparatus, the medium comprising:a data area configured for recording at least one video object in units of video object units; and a management area, separate from said data area, configured for managing said at least one video object recorded in said data area, wherein said management area includes one or more pieces of video object information, said one or more pieces of video object information include time map information, said time map information includes time map general information and one or more time entries, said time map general information includes a first data field containing the number of time entries in said time map information, said time map general information includes a second data field containing the time offset for said time map information, each of said one or more time entries includes a third data field containing a video object unit entry number and a fourth data field containing a time difference between a presentation start time of a video object unit specified by the corresponding time entry and a calculated presentation time, the plurality of pieces of audio or video information are recorded to decrease an access frequency to the audio or video information to be not more than N, N is a predetermined number of times upon sequentially playing back the plurality of pieces of audio or video information and is less than or equal to 1/{[1+STR/(PTRâˆ’STR)]*(SATa+JATa+MWTa)}, STR is a system transmission rate of a pickup head of a disc drive reading said information storage medium, PTR is a physical transmission rate of the pickup head of the disc drive reading said information storage medium, SATa is an average seek access time of the pickup head of the disc drive reading said information storage medium, JATa is an average jump access time of the pickup head of the disc drive reading said information storage medium, and MWTa is an average rotation wait time of the disc drive.