Patent ID: 8605216

Claim:
A method for processing a digital broadcast signal, the method comprising: demultiplexing a digital television (DTV) stream into a video stream, an audio stream, and a supplementary information stream, wherein the video stream includes user data bits, the user data bits carrying a digital television closed caption (DTVCC) transport channel including a DTVCC caption channel in which caption service data for providing at least one closed caption service is carried, wherein the supplementary information stream includes a program mapping table (PMT) and an event information table (EIT), wherein the PMT or EIT includes a caption service descriptor that comprises a caption information field indicating whether a DTVCC service or a line 21 closed caption service is present in the video stream in accordance with electronic industry association (EIA) 708, and wherein the caption information field is set when the DTVCC service is present and the caption information field is not set when the line 21 closed caption service is present in accordance with EIA 708; detecting caption information from the EIT or PMT; determining whether caption data in the video stream is analog caption data or digital caption data; decoding the caption data in the video stream; and decoding video data in the video stream.