Patent ID: 7933365

Claim:
A digital broadcast receiver, comprising: a tuner for tuning a radio frequency (RF) signal comprising enhanced data and main data and converting the RF signal into an intermediate frequency (IF) signal; a demodulator for demodulating the IF signal to a baseband signal; an equalizer for compensating channel distortion of the baseband signal and outputting equalized enhanced symbols; an information recovery unit for recovering encoding-related information from the equalized enhanced symbols; and a decoder for decoding the equalized enhanced symbols based on the encoding-related information, wherein the enhanced data and the main data are generated in a digital broadcast transmitter by: randomizing original enhanced data, first Reed Solomon (RS) encoding the randomized original enhanced data for forward error correction (FEC), convolutional encoding the first RS-encoded original enhanced data, second RS encoding the convolutional encoded original enhanced data and original main data, interleaving the second RS-encoded original enhanced and main data, trellis-encoding the interleaved original enhanced and main data in a trellis encoding unit that includes an encoder and a pre-coder, and multiplexing the trellis-encoded original enhanced and main data with a segment synchronization signal and a field synchronization signal, wherein trellis-encoding the interleaved original enhanced and main data comprises: encoding a first single bit among symbols corresponding to the interleaved original enhanced and main data at a coding rate of ½ in the encoder, and pre-coding a second single bit among the symbols in the pre-coder.