Patent ID: 7783960

Claim:
A DTV transmitter for coding main and enhanced data for transmission, the DTV transmitter comprising: a pre-coder for pre-coding the 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 the main data; a first 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 47 th , 48 th , 49 th , 50 th and 51 st bytes in at least one of the RS-coded enhanced data packets are non-systematic parity data; a data interleaver for interleaving the RS-coded main and enhanced data packets; and a second RS encoder for re-calculating RS parity data of the enhanced data for backward compatibility.