Patent ID: 7830974

Claim:
A digital television (DTV) transmitter for coding main and enhanced data, the DTV transmitter comprising: a byte-symbol converter for converting main data packets and enhanced data packets into symbols, the enhanced data packets including at least enhanced data bytes or data place holder bytes for known data symbols; a known data generator for generating a known data symbol; a symbol processor for processing a first symbol of the symbols output from the byte-symbol converter, the symbol processor post-decoding a first bit of the known data symbol generated by the known data generator and outputting the post-decoded first bit of the known data symbol and an initialization data bit when the first symbol is a symbol converted from the data place holder bytes; and a trellis encoder having one or more memories for trellis-encoding a second symbol output from the symbol processor, wherein the trellis encoder pre-codes the post-decoded first bit of the known data symbol, and wherein the one or more memories are initialized when the initialization data bit is processed in the trellis encoder.