# US 8,786,777 B2 · Digital broadcast receiver and method for processing caption thereof

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- Number: US 8,786,777 B2
- Document ID: US8786777B2
- Status: Granted
- Kind: B2
- Application number: 13/619,717
- Filed: 2012-09-14
- Published: 2013-01-10
- Granted: 2014-07-22
- Earliest claimed: 2003-09-17
- Assignees: LG Electronics Inc.
- Applicants: Tae Jin Park
- Inventors: Tae Jin Park
- Web page: https://patentgrep.com/patent/US8786777B2

## CPC

- H04N 21/23614: {Multiplexing of additional data and video streams (arrangements for simultaneous broadcast of plural pieces of information H04H20/28)}
- H04N 5/278: Subtitling
- H04N 5/38: Transmitter circuitry {for the transmission of television signals according to analogue transmission standards} (H04N5/14 takes precedence)
- 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
- 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)}
- H04N 7/0882: {for the transmission of character code signals, e.g. for teletext (circuits for the digital non-picture data signal H04N7/035)}
- 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}
- H04N 21/2353: {specifically adapted to content descriptors, e.g. coding, compressing or processing of metadata}
- 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)}
- H04N 21/2362: Generation or processing of Service Information [SI]
- H04N 21/2368: Multiplexing of audio and video streams
- H04N 21/426: Internal components of the client {; Characteristics thereof} (H04N5/44 takes precedence)
- 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)}
- H04N 21/4345: {Extraction or processing of SI, e.g. extracting service information from an MPEG stream}
- H04N 21/4348: {Demultiplexing of additional data and video streams}
- H04N 21/482: End-user interface for programme selection
- H04N 21/4884: {for displaying subtitles}
- 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 programme}
- H04N 21/85406: {involving a specific file format, e.g. MP4 format}
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## 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

### Claim 1

A method of transmitting a digital broadcast signal, the method comprising:
multiplexing video data, audio data, and supplementary data into an MPEG2 transport stream, the supplementary data including an event information table (EIT) and a program map table (PMT),
wherein the EIT or the PMT includes a caption service descriptor,
wherein the caption service descriptor includes caption information indicating whether a digital television closed caption service is present in the video data or a line 21 closed caption service is present in the video data in accordance with electronic industry association (EIA) 708, and language information defining a language associated with a closed caption service,
wherein the video data includes MPEG2 video data and user data,
wherein the caption service descriptor further includes a caption service number field, the caption service number field identifying a caption service number of each of the closed caption services, and
wherein the caption service number field is defined only when the digital television closed caption service in accordance with electronic industry association (EIA) 708 is present; and
transmitting the digital broadcast signal.