Patent ID: 8325849

Claim:
A method of processing broadcast data in a broadcast transmitting system, the method comprising: Reed-Solomon (RS) encoding and cyclic redundancy check (CRC) encoding enhanced data bytes; converting the RS-CRC encoded enhanced data bytes into enhanced data bits; encoding each of the converted enhanced data bits with one of a first coding rate and a second coding rate, thereby outputting data symbols; first interleaving the data symbols; converting the first interleaved data symbols into data bytes; forming a first data group including enhanced data corresponding to the converted data bytes, wherein the first data group comprises regions A, B and C, wherein the region A is central, the region B is concentric about the region A, and the region C is concentric about the regions A and B, wherein the region A includes enhanced data encoded with the first coding rate and known data sequences, and wherein the regions B and C include enhanced data encoded with the second coding rate, but do not include known data sequences; deinterleaving data of the first data group; outputting enhanced data packets including the deinterleaved data of the first data group; multiplexing the enhanced data packets with main data packets including main data; second interleaving data of the multiplexed data packets; and trellis encoding the second interleaved data.