Patent ID: 7711045

Claim:
A digital broadcast transmitter comprising: a randomizer to randomize a dual transport stream to produce randomized data, the transport stream including a normal and robust data packets and having inserted stuff bytes; a stuff-byte exchanger to replace the stuff bytes included in the randomized data with specified known data known by a receiver of the transmitter; a first Reed-Solomon (RS) encoder to perform an RS-encoding of data output from the stuff-byte exchanger; a packet formatter to interleave a robust data packet included in data output from the first RS encoder and to reformat the robust data packet; an interleaver to interleave the normal and reformatted robust data packets output from the packet formatter; a trellis encoder to perform a trellis encoding of data output from the interleaver using parity data; a second RS encoder to change a parity of the parity data used by the trellis encoder by performing an RS encoding of the robust data of the trellis-encoded data and to input the changed parity data to the trellis encoder to replace existing parity data previously used by the trellis encoder; and a modulator to modulate data from the trellis encoder and to perform a Radio Frequency (RF) up-converting of the modulated data, wherein at least one of the randomizer, the stuff-byte exchanger, the first RS encoder, the packet formatter, the interleaver, the trellis encoder, the second RS encoder, and the modulator is implemented as a hardware component.