Recording medium and method and appratus for reproducing and recording text subtitle streams

• US 20050191032A1
• Filed: 02/23/2005
• Published: 09/01/2005
• Est. Priority Date: 02/26/2004
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Yoo, Jea Yong, Kim, Byung Jin, Seo, Kang Soo
• Granted Patent: US 7,558,467 B2
• Time in Patent Office: Days
• US Class Current: 386/201
• CPC Class Codes: G11B 2220/2541 Blu-ray discs; Blue laser DVR discs
• CPC Class Codes: G11B 27/10 Indexing; Addressing; Timing or synchronising; Measuring tape travel
• CPC Class Codes: G11B 27/329 on a disc [VTOC]

Abstract

A recording medium and method and apparatus for reproducing and recording text subtitle streams are disclosed. A PlayList file contains a set of PlayItems and a SubPlayItem. Each PlayItem is configured to reproduce at least one main AV stream, and the SubPlayItem is configured to reproduce at least one text subtitle stream. The PlayList file further contains synchronization information which indicates a presentation start time of the SubPlayItem within a playing time interval of one of the set of PlayItems. The PlayList file, main AV stream, and text subtitle streams are recorded on a recording medium. Each text subtitle stream includes a plurality of dialog presentation segments, each of which includes at least one region of dialog text.

Claims

1. A recording medium for reproducing text subtitle streams, the recording medium comprising:

a first data area storing at least one PlayList file, each PlayList file containing a set of PlayItems and a SubPlayItem, each PlayItem being configured to reproduce at least one main AV stream, the SubPlayItem being configured to reproduce at least one text subtitle stream, the PlayList file further containing synchronization information which indicates a presentation start time of the SubPlayItem within a playing time interval of one of the set of PlayItems; and

a second data area storing the at least one main AV stream and the at least one text subtitle stream.

2. The recording medium of claim 1, wherein each text subtitle stream includes a plurality of dialog presentation segments, each dialog presentation segment including at least one region of dialog text.

3. The recording medium of claim 2, wherein the each dialog presentation segment specifies presentation start and end times of the at least one region of dialog text.

4. The recording medium of claim 1, wherein the synchronization information is contained in the SubPlayItem.

5. The recording medium of claim 1, wherein the synchronization information comprises a first data field indicating a PlayItem identification value of the one of the set of PlayItems, and a second data field indicating the presentation start time of the SubPlayItem.

6. The recording medium of claim 1, wherein the SubPlayItem starts its presentation when presentation of the PlayItem has reached to the presentation start time of the SubPlayItem.

7. The recording medium of claim 1, wherein the SubPlayItem includes a data field specifying a name of a Clip information file which corresponds to each text subtitle stream.

8. The recording medium of claim 1, wherein the SubPlayItem includes a data field indicating a presence of a multi-clip-entries structure.

9. A recording medium for reproducing text subtitle streams, the recording medium comprising:

a first data area storing a text subtitle stream including a plurality of dialog presentation segments, each dialog presentation segment containing at least one region of dialog text and specifying presentation start and end times of the at least one region of dialog text, wherein an initial value of a system time clock for the text subtitle stream is a presentation start time of the first dialog presentation segment included in the text subtitle stream.

10. The recording medium of claim 9, further comprising:

a second data area storing a Clip information file corresponding to the text subtitle stream, the clip information file including a data field indicating a source packet number of a source packet where a STC-sequence starts, the STC-sequence representing a sequence of source packets that are continuous based on the system time clock.

11. A method of reproducing text subtitle streams, the method comprising:

reading a PlayList file recorded on a recording medium;

reading a set of PlayItems and a SubPlayItem included in the PlayList file, each PlayItem being configured to reproduce at least one main AV stream recorded on the recording medium, the SubPlayItem being configured to reproduce at least one text subtitle stream recorded on the recording medium;

reading synchronization information included in the SubPlayItem, the synchronization information including a first data field indicating a PlayItem identification value of one of the set of PlayItems and a second data field indicating a presentation start time of the SubPlayItem within a playing time interval of the PlayItem identified by the PlayItem identification value; and

synchronizing presentation of the SubPlayItem with presentation of the PlayItem identified by the PlayItem identification value.

12. A method of reproducing text subtitle streams, the method comprising:

reading a text subtitle stream recorded on a recording medium;

reading a plurality of dialog presentation segments included in the text subtitle stream, each dialog presentation segment containing at least one region of dialog text and specifying presentation start and end times of the at least one region of dialog text;

setting an initial value of a system time clock for the text subtitle stream to a presentation start time of the first dialog presentation segment included in the text subtitle stream; and

presenting the at least one region of dialog text using the presentation start and end times which are based on the system time clock.

13. An apparatus for reproducing text subtitle streams, the apparatus comprising:

a driver configured to drive an optical reproducing device to reproduce data recorded on a recording medium; and

a controller configured to control the driver to read at least one PlayList file recorded on the recording medium, each PlayList file containing a set of PlayItems and a SubPlayItem, each PlayItem being configured to reproduce at least one main AV stream, the SubPlayItem being configured to reproduce at least one text subtitle stream, the SubPlayItem including synchronization information which indicates a presentation start time of the SubPlayItem within a playing time interval of one of the set of PlayItems.

14. An apparatus for reproducing text subtitle streams, the apparatus comprising:

a driver configured to drive an optical reproducing device to reproduce data recorded on a recording medium; and

a controller configured to control the driver to read a text subtitle stream recorded on the recording medium, the text subtitle stream including a plurality of dialog presentation segments, each dialog presentation segment containing at least one region of dialog text and specifying presentation start and end times of the at least one region of dialog text, wherein an initial value of a system time clock for the text subtitle stream is a presentation start time of the first dialog presentation segment included in the text subtitle stream. Best Available BEST AVAILABLE C