Patent ID: 7983354

Claim:
A digital broadcast transmitter comprising: a randomizer to randomize a transport stream into a specified position of which stuff bytes are inserted; a stuff-byte exchanger to replace the stuff bytes included in the randomized data with specified known data known by a receiver; a Reed-Solomon (RS) encoder to perform an RS-encoding of data output from the stuff-byte exchanger to add a parity to the data; an interleaver to interleave data output from the RS encoder; a trellis encoder to perform a trellis encoding of data output from the interleaver; an RS parity generator to generate another parity for the data changed according to a memory initialization of the trellis encoder, and to output the generated another parity to the trellis encoder; and a modulator/RF converter to modulate data output from the trellis encoder and to perform an RF up-converting of the modulated data, wherein: the trellis encoder replaces the parity added by the RS encoder with the another parity generated by the RS parity generator, and the specified known data has a feature that after the specified known data pass through the trellis encoder, the output specified known data has a spectrum similar to that of pseudo noise and has an average DC (direct current) value close to 0.