Patent ID: 8711281

Claim:
A transmitter for transmitting a digital broadcasting signal, the transmitter comprising: a multiplexer configured to multiplex audio data, video data, and control data in order to output a digital television (DTV) stream; and a transmitter configured to transmit the DTV stream, wherein the video data comprise user data bits carrying caption service data for providing at least one closed caption service, wherein the control data comprise a program mapping table (PMT) and an event information table (EIT), wherein at least the PMT or the EIT comprises a caption service descriptor, wherein the caption service descriptor comprises: a caption information field indicating whether a DTV 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; and a language field for defining a language associated with the at least one closed caption service, wherein the caption information field is set when the DTV closed caption service is present, and wherein the caption information field is clear when the line 21 closed caption service is present in accordance with EIA 708.