Patent ID: 8532222

Claim:
A digital broadcast transmitter, comprising: a block processor configured to encode mobile service data at a coding rate of 1/H and to block interleave the encoded mobile service data, wherein H is an integer equal to or greater than 2; a deinterleaver configured to deinterleave the block-interleaved mobile service data to output a first data group; an interleaver configured to convolutional interleave data of the first data group to output a second data group including the mobile service data, wherein: the second data group includes first segments and second segments, the first segments have first known data sequences and the second segments have second known data sequences, a number of data bytes for one of the first known data sequences is different from a number of data bytes for one of the second known data sequences, M second segments are positioned between an Nth first segment and an (N+k)th first segment, L second segments are positioned between the (N+k)th first segment and an (N+k+i)th first segment, and M, L, N, k and i are natural numbers and M and L are not the same; a trellis encoding module configured to trellis encode data of the second data group; and a multiplexer configured to multiplex the trellis-encoded data with segment synchronization data and field synchronization data, wherein the block processor is concatenated with the trellis encoding module.