Patent ID: 8817180
Filing Date: 2014-08-26
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 service descriptor further includes information identifying a caption service number that corresponds to a closed caption service of the closed caption services, and wherein the information identifying the caption service number is defined only when the digital television closed caption service is present; and transmitting the digital broadcast signal.