Patent ID: 7844885

Claim:
A digital television (DTV) transmitter for processing broadcast data, the DTV transmitter comprising: a pre-coder for pre-coding enhanced data for forward error correction (FEC); a data formatter for generating enhanced data packets including the pre-coded enhanced data; a multiplexer for multiplexing the enhanced data packets with main data packets including main data; a first Reed-Solomon (RS) encoder for RS-coding the multiplexed main and enhanced data packets, the first RS encoder RS-coding the main data packets with a systematic RS encoding scheme and RS-coding the enhanced data packets with a non-systematic RS encoding scheme, wherein 47th, 48th, 49th, 50th and 51st bytes in at least one of the RS-coded enhanced data packets are non-systematic parity data; and a data interleaver for interleaving data in the RS-coded main and enhanced data packets; and a trellis encoder for trellis-encoding the interleaved data, the trellis encoder being initialized at a beginning of a known data sequence.