Digital broadcast receiver and method for processing caption thereof

• US 7,852,407 B2
• Filed: 03/24/2010
• Issued: 12/14/2010
• Est. Priority Date: 09/17/2003
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Park, Tae Jin
• Primary Examiner(s): Natnael; Paulos M
• Application Number:
  US12/731,102
• Publication Number:
  US 20100177244A1
• Time in Patent Office: 265 Days
• Field of Search: 348/468, 348/461, 348/465, 348/467, 348564-565, 348/589, 348/600, 348/725, 348/478, 348/522, 725/37, 725/136
• US Class Current: 348/468
• CPC Class Codes: H04N 21/234345 the reformatting operation being performed only on part of the stream, e.g. a region of the image or a time segment
• CPC Class Codes: H04N 21/2353 specifically adapted to content descriptors, e.g. coding, compressing or processing of metadata
• CPC Class Codes: H04N 21/2355 involving reformatting operations of additional data, e.g. HTML pages optimising the visualization of content for information retrieval from the Internet G06F16/9577; tracking of instant messages H04L51/234; media packet handling at the source H04L65/762
• CPC Class Codes: H04N 21/23614 Multiplexing of additional data and video streams arrangements for simultaneous broadcast of plural pieces of information H04H20/28
• CPC Class Codes: H04N 21/2362 Generation or processing of Service Information [SI]
• CPC Class Codes: H04N 21/2368 Multiplexing of audio and video streams
• CPC Class Codes: H04N 21/426 Internal components of the client ; Characteristics thereof H04N5/44 takes precedence
• CPC Class Codes: H04N 21/434 Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream demultiplexing of data packets for data networks, e.g. RTP/UDP H04L65/00
• CPC Class Codes: H04N 21/4345 Extraction or processing of SI, e.g. extracting service information from an MPEG stream
• CPC Class Codes: H04N 21/4348 Demultiplexing of additional data and video streams
• CPC Class Codes: H04N 21/482 End-user interface for program selection broadcast systems using EPGs H04H60/72
• CPC Class Codes: H04N 21/4884 for displaying subtitles
• CPC Class Codes: H04N 21/8133 specifically related to the content, e.g. biography of the actors in a movie, detailed information about an article seen in a video program
• CPC Class Codes: H04N 21/85406 involving a specific file format, e.g. MP4 format
• CPC Class Codes: H04N 5/278 Subtitling
• CPC Class Codes: H04N 5/38 Transmitter circuitry for the transmission of television signals according to analogue transmission standards H04N5/14 takes precedence
• CPC Class Codes: H04N 7/035 Circuits for the digital non-picture data signal, e.g. for slicing of the data signal, for regeneration of the data-clock signal, for error detection or correction of the data signal
• CPC Class Codes: H04N 7/08 Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band , e.g. by time division H04N7/007 takes precedence
• CPC Class Codes: H04N 7/0882 for the transmission of character code signals, e.g. for teletext circuits for the digital non-picture data signal H04N7/035

Abstract

A digital cable broadcast receiver and a method for automatically processing caption data of various standards and types, is disclosed. The digital broadcast receiver includes: a demultiplexer for dividing a received broadcast stream into video data, audio data, supplementary information; a controller for determining whether caption data included in the video data is digital caption data or analog caption data on the basis of caption information included in the supplementary information, and outputting a control signal according to a result of the determining; a digital caption decoder for extracting and decoding digital caption data from the video data according to the control signal; and an analog caption decoder for extracting and decoding analog caption data from the video data according to the control signal.

Claims

1. A digital broadcasting receiver comprising:

a demultiplexer configured to demultiplex a digital television (DTV) stream to a video stream and a supplementary stream, the supplementary stream including an event information table (EIT) describing an event which has one or more closed captioning services;

a controller configured to decode a caption service descriptor providing closed captioning information and being in the EIT;

a video parser configured to parse the video stream and output MPEG-2 video data and user data from the parsed video stream;

a video decoder configured to decode the MPEG-2 video data;

a caption decoder configured to decode caption data in the user data; and

a video combiner configured to combine the decoded caption data and the MPEG-2 video data,

wherein the caption service descriptor comprises information indicating whether a digital television closed caption service is present in the video stream or a line 21 closed caption service is present in the video stream in accordance with electronic industry association (EIA) 708, and

wherein the caption service descriptor further comprises information defining a language associated with a closed caption service.

2. The digital broadcasting receiver of claim 1, wherein the caption service descriptor further comprises information indicating a number of closed caption services.

3. The digital broadcasting receiver of claim 1, wherein the caption service descriptor further comprises information identifying a caption service number of a closed caption service.

4. The digital broadcasting receiver of claim 1, wherein the caption service descriptor further comprises information indicating whether or not a closed caption service is formatted for display with a 16:

9 aspect ratio.

5. A method of processing a digital broadcast signal, the method comprising:

demultiplexing a digital television (DTV) stream to a video stream and a supplementary stream, the supplementary stream including an event information table (EIT) describing an event which has one or more closed captioning services;

decoding a caption service descriptor providing closed captioning information and being in the EIT;

parsing the video stream and outputting MPEG-2 video data and user data from the parsed video stream;

decoding the MPEG-2 video data and caption data in the user data, respectively; and

combining the decoded caption data and MPEG-2 video data,

wherein the caption service descriptor comprises information indicating whether a digital television closed caption service is present in the video stream or a line 21 closed caption service is present in the video stream in accordance with electronic industry association (EIA) 708, and

wherein the caption service descriptor further comprises information defining a language associated with a closed caption service.

6. The method of claim 5, wherein the caption service descriptor further comprises information indicating a number of closed caption services.

7. The method of claim 5, wherein the caption service descriptor further comprises information identifying a caption service number of a closed caption service.

8. The method claim 5, wherein the caption service descriptor further comprises information indicating whether or not a closed caption service is formatted for display with a 16:

9 aspect ratio.