Digital broadcast receiver and method for processing caption thereof

摘要

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.

主权项

1. An apparatus for receiving a digital broadcast signal comprising:
a receiver for receiving the digital broadcast signal; a demultiplexer for demultiplexing MPEG2 transport stream in the digital broadcast signal into video data, audio data, and supplementary data, the supplementary data including an event information table (EIT) and a program map table (PMT), wherein the video data includes MPEG2 video data and user data, 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, andwherein the caption service descriptor includes a caption service number, and wherein the caption service number is included when the digital television closed caption service in accordance with electronic industry association (EIA) 708 is present; a first decoder for decoding the supplementary data; a video parser for parsing the video data; a second decoder for decoding the parsed video data; and a display for providing a caption service in the decoded video data.