Patent ID: 8885101

Claim:
A digital broadcasting transmitter comprising: a multiplexer configured to multiplex 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, and 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, information indicating a number of closed caption services present in an associated EIT event, and information identifying a caption service number of a closed caption service of the closed caption services; and a transmitter configured to modulate the MPEG2 transport stream and to transmit the modulated MPEG2 transport stream via a broadcast signal, wherein the information identifying a caption service number is defined only when the digital television closed caption service is present.