Patent ID: 8526508

Claim:
A method of processing broadcast data in a broadcast transmitting system, the method comprising: randomizing enhanced data; Reed-Solomon (RS) encoding and Cyclic Redundancy Check (CRC) encoding the randomized enhanced data to build an RS frame; encoding the enhanced data in the built RS frame at a coding rate of at least ½ or ¼; first interleaving the encoded enhanced data; deinterleaving the first interleaved enhanced data; first multiplexing enhanced data packets including the deinterleaved enhanced data with main data packets including main data; randomizing the main data in the multiplexed enhanced and main data packets; second interleaving the enhanced data in the multiplexed enhanced and main data packets and the randomized main data to output a data group having the interleaved enhanced data and the interleaved main data; trellis encoding data in the data group in a trellis encoding unit; and second multiplexing the trellis-encoded data with field synchronization data and segment synchronization data, wherein the data group includes first segments, second segments and third segments, the second segments being positioned between the first and third segments, the first segments having enhanced data and main data, the second segments having enhanced data and a plurality of known data sequences, and the third segments having enhanced data and main data, and wherein the enhanced data in the first, second and third segments are encoded by a non-systematic RS encoding scheme, the main data in the first and third segments are encoded by a systematic RS encoding scheme, and at least two of the plurality of known data sequences have different patterns.