Patent ID: 8754985
Filing Date: 2014-06-17
Classification: H04N

Abstract:
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, wherein the caption information is set when the digital television closed caption service is present in accordance with EIA 708, and wherein the caption information is clear when the line 21 closed caption service is present in accordance with EIA 708; and transmitting the digital broadcast signal, wherein the caption service descriptor further includes a caption service number that corresponds to the caption service data, and wherein the caption service number is defined only when the digital television closed caption service is present.