Patent ID: 8254485

Claim:
A method of processing broadcast data in a digital broadcast transmitter, the method comprising: randomizing enhanced data; convolutional-encoding the randomized enhanced data with an N/M code rate, wherein N and M are natural numbers, and wherein N is less than M; deinterleaving the convolutional-encoded enhanced data; removing data bytes inserted for Reed-Solomon (RS) encoding from enhanced data packets including the deinterleaved enhanced data; RS encoding data in the enhanced data packets from which the data bytes are removed; interleaving the RS-encoded data; trellis-encoding the interleaved data with an M/L code rate, wherein the trellis-encoded data include a known data sequence that includes a first K-symbol sequence and a second K-symbol sequence that have a same pattern, wherein K is an integer greater than 1, wherein L is a natural number, and wherein M is less than L; multiplexing the trellis-encoded data with segment sync data and field sync data; and inserting pilot data into the multiplexed data.