Patent ID: 8689086

Claim:
A method of processing broadcast data in a transmitting system, the method comprising: Reed-Solomon (RS) and Cyclic Redundancy Check (CRC) encoding enhanced data bytes to build an RS frame; block processing data bytes in the built RS frame, wherein block processing the data bytes comprises: converting the data bytes in the built RS frame to data bits; encoding each of the data bits at a 1/2 coding rate to output data symbols; interleaving the data symbols; and converting the interleaved data symbols to data bytes; forming a data group including enhanced data corresponding to the data bytes converted from the interleaved data symbols, a plurality of known data sequences, and signaling information; deinterleaving the enhanced data in the data group; multiplexing the deinterleaved enhanced data with main data; interleaving the multiplexed data; and trellis encoding the interleaved data, wherein: encoding at the 1/2 coding rate is achieved by outputting a corresponding bit as a first output bit and outputting as a second output bit after encoding the corresponding bit; one data symbol consists of the first output bit and the second output bit; at least two of the plurality of known data sequences have different lengths; and the signaling information includes data group information.