Patent ID: 7764323

Claim:
A digital television (DTV) transmitter for coding main and enhanced data packets for transmission, the DTV transmitter comprising: a pre-processor for pre-processing the enhanced data packets by coding the enhanced data packets for forward error correction (FEC) and expanding the FEC-coded data packets; a data formatter for adding first null data into first place holders within each pre-processed enhanced data packet; a first multiplexer for multiplexing the main data packets with the enhanced data packets having the first null data; a holder inserter for inserting second null data into second place holders within an enhanced data packet outputted from the first multiplexer; a data interleaver for replacing the second null data with parity data; a data generator for generating at least one known data sequence; a symbol processor for replacing the first null data included in an output of the data interleaver with the at least one known data sequence; and a non-systematic Reed-Solomon (RS) encoder for generating the parity data by performing non-systematic RS-coding on an output of the symbol processor, and for providing the parity data to the data interleaver.