Patent ID: 8035742

Claim:
A transmitter for transmitting a digital broadcasting signal, the transmitter comprising: a multiplexer configured to multiplex audio data, video data, and control data to output a digital television (DTV) bitstream; and a transmitter configured to transmit the DTV bitstream, wherein the video data 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 control data 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 data in accordance with electronic industry association (EIA) 708, 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 the EIA 708, wherein the caption service descriptor further comprises a caption service number that corresponds to the caption service data, and wherein the caption service number is defined only when the DTVCC service is present.